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Title:
METHODS FOR EPITYPE ENRICHED PCR SCREENING
Document Type and Number:
WIPO Patent Application WO/2024/064919
Kind Code:
A2
Abstract:
Methods and compositions disclosed herein involve detecting a nucleic acid epitype, which comprises a region of nucleic acid containing one or more methylation sites. For example, detecting a nucleic acid epitype can involve determining methylation statuses of CpG sites of the region of nucleic acid as fully methylated, partially methylated, or non-methylated. In various embodiments, the determination of nucleic acid epitypes may be useful for screening subjects who may be at risk for various health conditions (e.g., an example of which includes cancer). In various embodiments, determining a nucleic acid epitype using the sample can be useful for determining whether the sample is not at risk of the health condition. In various embodiments, determining a nucleic acid epitype using the sample is useful for detecting circulating tumor DNA in the subject.

Inventors:
SHUBER ANTHONY P (US)
Application Number:
PCT/US2023/074942
Publication Date:
March 28, 2024
Filing Date:
September 22, 2023
Export Citation:
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Assignee:
FLAGSHIP PIONEERING INNOVATIONS VI LLC (US)
International Classes:
C12Q1/686
Attorney, Agent or Firm:
ZHANG, Clark et al. (US)
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Claims:
CLAIMS 1. A method of detecting a nucleic acid epitype, comprising: providing a nucleic acid epitype probe designed to be complementary to a converted nucleic acid epitype, wherein the converted nucleic acid epitype comprises one or more CpG sites that, prior to conversion, were non-methylated, partially methylated, or fully methylated; contacting a nucleic acid template derived from converted cell-free DNA obtained from a biological sample of a subject with the nucleic acid epitype probe, wherein the epitype probe hybridizes to the nucleic acid template if the epitype probe is complementary to the nucleic acid template; and detecting the nucleic acid epitype by detecting the nucleic acid epitype probe that hybridized to the nucleic acid template. 2. The method of claim 1, wherein detecting the nucleic acid epitype probe comprises sequencing the nucleic acid epitype probe to determine the identity of the nucleic acid epitype. 3. The method of claim 1 or 2, wherein each of the one or more CpG sites are selected from a CpG site in a CpG island (CGI) shown in any of Tables 1-4. 4. The method of any one of claims 1-3, wherein detecting the nucleic acid epitype comprises determining a methylation status of the nucleic acid epitype based on the detected nucleic acid epitype probe that hybridized to the nucleic acid template. 5. The method of claim 4, wherein the methylation status of the nucleic acid epitype is one of non-methylated, partially methylated, or fully methylated. 6. The method of any one of claims 1-5, wherein contacting the nucleic acid template derived from converted cell-free DNA with the nucleic acid epitype probe occurs in the presence of a hybridization solution that selectively raises the stability of A:T base pairs to substantially the same stability of G:C base pairs.

7. The method of claim 6, wherein the hybridization solution comprises tetramethylammonium chloride (TMAC). 8. The method of any one of claims 1-7, wherein the nucleic acid epitype probe comprises a binding moiety that binds to a solid support. 9. The method of claim 8, wherein the binding moiety comprises a biotin moiety. 10. The method of any one of claims 1-9, wherein the nucleic acid epitype probe comprises a detection moiety. 11. The method of claim 10, wherein the detection moiety comprises a fluorescent tag. 12. The method of any one of claims 1-11, wherein the nucleic acid epitype probe comprises a barcode. 13. The method of any one of claims 1-12, further comprising isolating the nucleic acid template hybridized to the nucleic acid epitype probe. 14. The method of claim 13, wherein isolating the nucleic acid template hybridized to the nucleic acid epitype probe comprises exposing the binding moiety to the solid support, and separating the solid support from non-specifically associated nucleic acids. 15. The method of claim 13, wherein isolating the nucleic acid template hybridized to the nucleic acid epitype probe comprises performing a streptavidin bead pulldown. 16. The method of claim 15, wherein isolating the nucleic acid template hybridized to the nucleic acid epitype probe further comprises enriching for the nucleic acid template hybridized to the nucleic acid epitype probe. 17. The method of claim 16, wherein enriching for the nucleic acid template hybridized to the nucleic acid epitype probe further comprises performing a wash to remove non- specifically associated nucleic acids. 18. The method of any one of claims 1-16, further comprising: subsequent to isolating the nucleic acid template hybridized to the nucleic acid epitype probe and prior to detecting the nucleic acid epitype, dissociating the nucleic acid epitype probe from the nucleic acid template. 19. The method of claim 18, wherein dissociating the nucleic acid epitype probe from the nucleic acid template comprises exposing the nucleic acid epitype probe and nucleic acid template to a temperature between 40oC and 100oC, between 45oC and 95oC, between 50oC and 90oC, between 55oC and 90oC, between 60oC and 85oC, between 65oC and 80oC, between 70oC and 75oC, between 45oC and 75oC, between 50oC and 70oC, or between 55oC and 65oC. 20. The method of claim 18 or 19, wherein dissociating the nucleic acid epitype probe from the nucleic acid template comprises exposing the nucleic acid epitype probe and nucleic acid template to a pH between 7.0 and 13.0, between 7.5 and 12.5, between 8.0 and 12.0, between 8.5 and 11.5, between 9.0 and 11.0, between 9.5 and 10.5, between 9.8 and 10.2, between 7.0 and 10.0, between 7.5 and 9.5, between 8.0 and 9.0, between 10.0 and 13.0, between 10.5 and 12.5, or between 11.0 and 12.0. 21. The method of any one of claims 18-20, further comprising pooling the dissociated nucleic acid epitype probe with one or more other nucleic acid epitype probes, wherein each of the one or more other nucleic acid epitype probes were dissociated from other nucleic acid templates. 22. The method of claim 21, wherein the epitype probe and the one or more other nucleic acid epitype probes each comprise different barcodes. 23. The method of claim 21 or 22, further comprising amplifying the dissociated nucleic acid epitype probe. 24. The method of any one of claims 21-23, further comprising demultiplexing sequencing data from the nucleic acid epitype probe and the one or more other nucleic acid epitype probes using the differing barcodes of the nucleic acid epitype probe and one or more other nucleic acid epitype probes.

25. The method of any one of claims 1-24, further comprising: prior to providing the nucleic acid epitype probe, performing conversion of cell-free DNA obtained from the biological sample of the subject. 26. The method of any one of claims 1-25, wherein the converted cell-free DNA comprises bi-sulfite converted cell-free DNA. 27. The method of any one of claims 1-26, wherein the biological sample of the subject is a blood sample. 28. The method of any one of claims 1-27, further comprising: providing one or more additional nucleic acid epitype probes, wherein one of the additional nucleic acid epitype probe comprises a sequence that differs from the sequence of the nucleic acid epitype probe by one nucleotide. 29. The method of claim 28, wherein the one nucleotide difference is a G Æ A substitution. 30. The method of claim 28 or 29, wherein the one or more additional nucleic acid epitype probes do not hybridize with the nucleic acid template. 31. The method of any one of claims 28-30, wherein the one or more additional nucleic acid epitype probes comprise (2^ െ 1) additional nucleic acid epitype probes, wherein X represents a total number of CpG sites in a sequence of the cell-free DNA. 32. The method of claim 31, wherein each of the (2^ െ 1) additional nucleic acid epitype probes comprises one or more of a biotin moiety, a fluorescent tag, or a barcode. 33. The method of any one of claims 28-32, wherein the nucleic acid epitype probe and at least one of the (2^ െ 1) additional nucleic acid epitype probes comprise a common barcode sequence. 34. The method of any one of claims 28-32, wherein providing the nucleic acid epitype probe and providing one or more additional nucleic acid epitype probes occurs simultaneously.

35. A method of detecting a nucleic acid epitype, comprising: providing a nucleic acid epitype probe designed to be complementary to a converted nucleic acid epitype, wherein the converted nucleic acid epitype comprises one or more CpG sites that, prior to conversion, were non-methylated, partially methylated, or fully methylated; contacting a nucleic acid template derived from converted cell-free DNA obtained from a biological sample of a subject with the nucleic acid epitype probe in the presence of a hybridization solution that selectively raises the stability of A:T base pairs to substantially the same stability of G:C base pairs, wherein the epitype probe hybridizes to the nucleic acid template if the epitype probe is complementary to the nucleic acid template; amplifying the nucleic acid template using the nucleic acid epitype probe as an amplification primer, and detecting the nucleic acid epitype by detecting a signal indicative of presence of an amplification product generated by amplifying the nucleic acid template. 36. The method of claim 35, wherein amplifying the nucleic acid template comprises performing polymerase chain reaction. 37. The method of claim 35 or 36, wherein detecting the signal indicative of the amplification product comprises detecting a fluorescent signal. 38. The method of any one of claims 35-37, wherein each of the one or more CpG sites are selected from a CpG site in a CpG island (CGI) shown in any of Tables 1-4. 39. The method of any one of claims 35-38, wherein detecting the nucleic acid epitype further comprises determining a methylation status of the nucleic acid epitype based on the presence of the amplification product. 40. The method of claim 39, wherein the methylation status of the nucleic acid epitype is one of non-methylated, partially methylated, or fully methylated.

41. The method of any one of claims 35-40, wherein the hybridization solution comprises tetramethylammonium chloride (TMAC). 42. The method of any one of claims 35-41, wherein detecting the nucleic acid epitype further comprises determining a number of amplification cycles until the signal indicative of presence of the amplification product was detected. 43. The method of claim 42, wherein detecting the nucleic acid epitype further comprises comparing the number of amplification cycles to a number of amplification cycles until a corresponding signal was detected in a control sample. 44. A method for detecting circulating tumor DNA in a biological sample of a subject, the method comprising: providing a nucleic acid epitype probe designed to be complementary to a converted nucleic acid epitype, wherein the converted nucleic acid epitype comprises one or more CpG sites that, prior to conversion, were non-methylated, partially methylated, or fully methylated; contacting a nucleic acid template derived from converted cell-free DNA obtained from a biological sample of a subject with the nucleic acid epitype probe in the presence of a hybridization solution that selectively raises the stability of A:T base pairs to substantially the same stability of G:C base pairs, wherein the epitype probe hybridizes to the nucleic acid template if the epitype probe is complementary to the nucleic acid template; and detecting the circulating tumor DNA by detecting the nucleic acid epitype probe that hybridized to the nucleic acid template. 45. The method of claim 44, wherein detecting the nucleic acid epitype probe comprises sequencing the epitype probe to determine the identity of the nucleic acid epitype. 46. The method of claim 44 or 45, wherein each of the one or more CpG sites are selected from a CpG site in a CpG island (CGI) shown in any of Tables 1-4.

47. The method of any one of claims 44-46, wherein detecting the nucleic acid epitype comprises determining a methylation status of the nucleic acid epitype based on the detected nucleic acid epitype probe that hybridized to the nucleic acid template. 48. The method of claim 47, wherein the methylation status of the nucleic acid epitype is one of non-methylated, partially methylated, or fully methylated. 49. The method of any one of claims 44-48, wherein the hybridization solution comprises tetramethylammonium chloride (TMAC). 50. The method of any one of claims 44-49, wherein the nucleic acid epitype probe comprises a binding moiety that binds to a solid support. 51. The method of claim 50, wherein the binding moiety comprises a biotin moiety. 52. The method of any one of claims 44-51, wherein the nucleic acid epitype probe comprises a detection moiety. 53. The method of claim 52, wherein the detection moiety comprises a fluorescent tag. 54. The method of any one of claims 44-53, wherein the nucleic acid epitype probe comprises a barcode. 55. The method of any one of claims 44-54, further comprising isolating the nucleic acid template hybridized to the nucleic acid epitype probe. 56. The method of claim 55, wherein isolating the nucleic acid template hybridized to the nucleic acid epitype probe comprises exposing the binding moiety to the solid support, and separating the solid support from non-specifically associated nucleic acids. 57. The method of claim 55, wherein isolating the nucleic acid template hybridized to the nucleic acid epitype probe comprises performing a streptavidin bead pulldown.

58. The method of any one of claims 55-57, wherein isolating the nucleic acid template hybridized to the nucleic acid epitype probe further comprises enriching for the nucleic acid template hybridized to the nucleic acid epitype probe. 59. The method of claim 58, wherein enriching for the nucleic acid template hybridized to the nucleic acid epitype probe further comprises performing a wash to remove non- specifically associated nucleic acids. 60. The method of any one of claims 44-59, further comprising: subsequent to isolating the nucleic acid template hybridized to the nucleic acid epitype probe and prior to detecting the nucleic acid epitype, dissociating the nucleic acid epitype probe from the nucleic acid template. 61. The method of claim 60, wherein dissociating the nucleic acid epitype probe from the nucleic acid template comprises exposing the nucleic acid epitype probe and nucleic acid template to a temperature between 40oC and 100oC, between 45oC and 95oC, between 50oC and 90oC, between 55oC and 90oC, between 60oC and 85oC, between 65oC and 80oC, between 70oC and 75oC, between 45oC and 75oC, between 50oC and 70oC, or between 55oC and 65oC. 62. The method of claim 60 or 61, wherein dissociating the nucleic acid epitype probe from the nucleic acid template comprises exposing the nucleic acid epitype probe and nucleic acid template to a pH between 7.0 and 13.0, between 7.5 and 12.5, between 8.0 and 12.0, between 8.5 and 11.5, between 9.0 and 11.0, between 9.5 and 10.5, between 9.8 and 10.2, between 7.0 and 10.0, between 7.5 and 9.5, between 8.0 and 9.0, between 10.0 and 13.0, between 10.5 and 12.5, or between 11.0 and 12.0. 63. The method of any one of claims 60-62, further comprising pooling the dissociated nucleic acid epitype probe with one or more other nucleic acid epitype probes, wherein the one or more other nucleic acid epitype probes were dissociated from other nucleic acid templates.

64. The method of claim 63, wherein the epitype probe and the one or more other nucleic acid epitype probes each comprise different barcodes. 65. The method of claim 63 or 64, further comprising amplifying the dissociated nucleic acid epitype probe. 66. The method of any one of claims 63-65, further comprising demultiplexing sequencing data from the nucleic acid epitype probe and the one or more other nucleic acid epitype probes using the differing barcodes of the nucleic acid epitype probe and one or more other nucleic acid epitype probes. 67. The method of any one of claims 44-66, further comprising: prior to providing the nucleic acid epitype probe, performing conversion of cell-free DNA obtained from the biological sample of the subject. 68. The method of any one of claims 44-67, wherein the converted cell-free DNA comprises bi-sulfite converted cell-free DNA. 69. The method of any one of claims 44-68, wherein the biological sample of the subject is a blood sample. 70. The method of any one of claims 44-69, further comprising: providing one or more additional nucleic acid epitype probes, wherein one of the additional nucleic acid epitype probe comprises a sequence that differs from the sequence of the nucleic acid epitype probe by one nucleotide. 71. The method of claim 70, wherein the one nucleotide difference is a G A substitution. 72. The method of claim 70 or 71, wherein the one or more additional nucleic acid epitype probes do not hybridize with the nucleic acid template. 73. The method of any one of claims 70-72, wherein the one or more additional nucleic acid epitype probes comprise (2^ െ 1) additional nucleic acid epitype probes, wherein X represents a total number of CpG sites in a sequence of the cell-free DNA.

74. The method of claim 73, wherein each of the (2^ െ 1) additional nucleic acid epitype probes comprises one or more of a biotin moiety, a fluorescent tag, or a barcode. 75. The method of any one of claims 70-74, wherein the nucleic acid epitype probe and at least one of the (2^ െ 1) additional nucleic acid epitype probes comprise a common barcode sequence. 76. The method of any one of claims 70-74, wherein providing the nucleic acid epitype probe and providing one or more additional nucleic acid epitype probes occurs simultaneously. 77. A method for detecting circulating tumor DNA in a biological sample of a subject, the method comprising: providing a nucleic acid epitype probe designed to be complementary to a converted nucleic acid epitype, wherein the converted nucleic acid epitype comprises one or more CpG sites that, prior to conversion, were non-methylated, partially methylated, or fully methylated; contacting a nucleic acid template derived from converted cell-free DNA obtained from a biological sample of a subject with the nucleic acid epitype probe in the presence of a hybridization solution that selectively raises the stability of A:T base pairs to substantially the same stability of G:C base pairs, wherein the epitype probe hybridizes to the nucleic acid template if the epitype probe is complementary to the nucleic acid template; amplifying the nucleic acid template using the nucleic acid epitype probe as an amplification primer, and detecting the circulating tumor DNA by detecting a signal indicative of presence of an amplification product generated by amplifying the nucleic acid template. 78. The method of claim 77, wherein amplifying the nucleic acid template comprises performing polymerase chain reaction. 79. The method of claim 77 or 78, wherein detecting the signal indicative of the amplification product comprises detecting a fluorescent signal.

80. The method of any one of claims 77-79, wherein each of the one or more CpG sites are selected from a CpG site in a CpG island (CGI) shown in any of Tables 1-4. 81. The method of any one of claims 77-80, wherein detecting the nucleic acid epitype further comprises determining a methylation status of the nucleic acid epitype based on the presence of the amplification product. 82. The method of claim 81, wherein the methylation status of the nucleic acid epitype is one of non-methylated, partially methylated, or fully methylated. 83. The method of any one of claims 77-82, wherein the hybridization solution comprises tetramethylammonium chloride (TMAC). 84. The method of any one of claims 77-83, wherein detecting the nucleic acid epitype further comprises determining a number of amplification cycles until the signal indicative of presence of the amplification product was detected. 85. The method of claim 84, wherein detecting the nucleic acid epitype further comprises comparing the number of amplification cycles to a number of amplification cycles until a corresponding signal was detected in a control sample. 86. A composition comprising: a nucleic acid template derived from bisulfite converted cell-free DNA obtained from a biological sample of a subject, wherein prior to conversion, the cell-free DNA comprises a sequence between 50-500 nucleotides, between 75-400 nucleotides, between 100-300 nucleotides, between 125-250 nucleotides, or between 150-200 nucleotides of a CpG island (CGI), wherein between 0 and X cytosines of the sequence of the cell-free DNA are converted to a uracil in the nucleic acid template, wherein X represents a total number of CpG sites in the sequence of the cell-free DNA; and a nucleic acid epitype probe hybridized to the nucleic acid template, wherein the nucleic acid epitype probe comprises a sequence complementary to the sequence of the nucleic acid template. 87. A composition comprising a nucleic acid epitype probe comprising: a nucleic acid sequence complementary to a sequence of a nucleic acid template derived from bisulfite converted cell-free DNA obtained from a biological sample of a subject, wherein prior to conversion, the cell-free DNA comprises a sequence between 50-500 nucleotides, between 75-400 nucleotides, between 100-300 nucleotides, between 125-250 nucleotides, or between 150-200 nucleotides of a CpG island (CGI), and a binding moiety that binds to a solid support, a detection moiety, and/or a barcode. 88. The composition of claim 86 or 87, wherein the CpG island is selected from a CpG island shown in Tables 1-4. 89. The composition of any one of claims 86-88, further comprising a hybridization solution. 90. The composition of claim 89, wherein the hybridization solution comprises tetramethylammonium chloride (TMAC). 91. The composition of any one of claims 86-90, wherein the nucleic acid epitype probe comprises a binding moiety that binds to a solid support. 92. The composition of claim 91, wherein the binding moiety comprises a biotin moiety. 93. The composition of any one of claims 86-92, wherein the nucleic acid epitype probe comprises a detection moiety. 94. The composition of claim 93, wherein the detection moiety comprises a fluorescent tag. 95. The composition of any one of claims 86-94, wherein the nucleic acid epitype probe comprises a barcode. 96. The composition of any one of claims 86-95, further comprising a bead non- covalently linked to the nucleic acid template. 97. The composition of any one of claims 86-96, further comprising one or more additional nucleic acid epitype probes, wherein one of the additional nucleic acid epitype probe comprises a sequence that differs from the sequence of the nucleic acid epitype probe by one nucleotide. 98. The composition of claim 97, wherein the one nucleotide difference is a G A substitution. 99. The composition of claim 97 or 98, wherein the one or more additional nucleic acid epitype probes are not hybridized with the nucleic acid template. 100. The composition of any one of claims 97-99, wherein the one or more additional nucleic acid epitype probes comprise (2^ െ 1) additional nucleic acid epitype probes, wherein X represents a total number of CpG sites in the sequence of corresponding cell-free DNA. 101. The composition of claim 100, wherein each of the (2^ െ 1) additional nucleic acid epitype probes comprises a biotin moiety. 102. The composition of claim 100 or 101, wherein each of the (2^ െ 1) additional nucleic acid epitype probes comprises a fluorescent tag. 103. The composition of any one of claims 100-102, wherein each of the (2^ െ 1) additional nucleic acid epitype probes comprises a barcode.

Description:
METHODS FOR EPITYPE ENRICHED PCR SCREENING CROSS-REFERENCE TO RELATED APPLICATIONS [0001] This application claims the benefit of and priority to U.S. Provisional Patent Application No.63/376,894 filed September 23, 2022, the entire disclosure of which is hereby incorporated by reference in its entirety for all purposes. BACKGROUND [0002] DNA methylation is an epigenetic process by which a methyl group is added to DNA. This typically occurs at the C5 position of a cytosine to form 5-methylcytosine. DNA methylation can change the activity of DNA, e.g., by repressing gene transcription, and functions in many biological processes including genomic imprinting, X-chromosome inactivation, repression of transposable elements, aging, and carcinogenesis. Abnormal DNA methylation is associated with the development of health conditions, such as cancer. CpG islands can become abnormally methylated, with hypomethylation linked to chromosomal instability and hypermethylation associated with promoters and oncogene suppressor silencing. [0003] Differential DNA methylation can result in various patterns of methylation across numerous CpG sites. However, accurately detecting these various patterns of methylation, at the single nucleotide base resolution level, is challenging. Accordingly, there is a need for improved methods for detecting patterns of DNA methylation at the single nucleotide base level. Assessment of DNA methylation states can be used to predict risk for developing certain health conditions, such as cancer. SUMMARY [0004] Disclosed herein are methods and compositions useful for determining nucleic acid epitypes for subjects. The determination of nucleic acid epitypes may be useful for screening subjects who may be at risk for various health conditions (e.g., cancer). A nucleic acid epitype can be determined using a sample obtained from a subject. In various embodiments, determining a nucleic acid epitype using the sample can be useful for determining whether the subject is at risk for or not at risk for the health condition. In various embodiments, determining a nucleic acid epitype using the sample is useful for detecting circulating tumor DNA in the subject. [0005] Disclosed herein is a method of detecting a nucleic acid epitype, comprising: providing a nucleic acid epitype probe designed to be complementary to a converted nucleic acid epitype, wherein the converted nucleic acid epitype comprises one or more CpG sites that, prior to conversion, were non-methylated, partially methylated, or fully methylated; contacting a nucleic acid template derived from converted cell-free DNA obtained from a biological sample of a subject with the nucleic acid epitype probe, wherein the epitype probe hybridizes to the nucleic acid template if the epitype probe is complementary to the nucleic acid template; and detecting the nucleic acid epitype by detecting the nucleic acid epitype probe that hybridized to the nucleic acid template. In various embodiments, detecting the nucleic acid epitype probe comprises sequencing the nucleic acid epitype probe to determine the identity of the nucleic acid epitype. In various embodiments, each of the one or more CpG sites are selected from a CpG site in a CpG island (CGI) shown in any of Tables 1-4. In various embodiments, detecting the nucleic acid epitype comprises determining a methylation status of the nucleic acid epitype based on the detected nucleic acid epitype probe that hybridized to the nucleic acid template. In various embodiments, the methylation status of the nucleic acid epitype is one of non-methylated, partially methylated, or fully methylated. [0006] In various embodiments, contacting the nucleic acid template derived from converted cell-free DNA with the nucleic acid epitype probe occurs in the presence of a hybridization solution that selectively raises the stability of A:T base pairs to substantially the same stability of G:C base pairs. In various embodiments, the hybridization solution comprises tetramethylammonium chloride (TMAC). In various embodiments, the nucleic acid epitype probe comprises a binding moiety that binds to a solid support. In various embodiments, the binding moiety comprises a biotin moiety. In various embodiments, the nucleic acid epitype probe comprises a detection moiety. In various embodiments, the detection moiety comprises a fluorescent tag. In various embodiments, the nucleic acid epitype probe comprises a barcode. [0007] In various embodiments, methods disclosed herein further comprise isolating the nucleic acid template hybridized to the nucleic acid epitype probe. In various embodiments, isolating the nucleic acid template hybridized to the nucleic acid epitype probe comprises exposing the binding moiety to the solid support, and separating the solid support from non-specifically associated nucleic acids. In various embodiments, isolating the nucleic acid template hybridized to the nucleic acid epitype probe comprises performing a streptavidin bead pulldown. In various embodiments, isolating the nucleic acid template hybridized to the nucleic acid epitype probe further comprises enriching for the nucleic acid template hybridized to the nucleic acid epitype probe. In various embodiments, enriching for the nucleic acid template hybridized to the nucleic acid epitype probe further comprises performing a wash to remove non-specifically associated nucleic acids. [0008] In various embodiments, methods disclosed herein further comprise: subsequent to isolating the nucleic acid template hybridized to the nucleic acid epitype probe and prior to detecting the nucleic acid epitype, dissociating the nucleic acid epitype probe from the nucleic acid template. In various embodiments, dissociating the nucleic acid epitype probe from the nucleic acid template comprises exposing the nucleic acid epitype probe and nucleic acid template to a temperature between 40 o C and 100 o C, between 45 o C and 95 o C, between 50 o C and 90 o C, between 55 o C and 90 o C, between 60 o C and 85 o C, between 65 o C and 80 o C, between 70 o C and 75 o C, between 45 o C and 75 o C, between 50 o C and 70 o C, or between 55 o C and 65 o C. In various embodiments, dissociating the nucleic acid epitype probe from the nucleic acid template comprises exposing the nucleic acid epitype probe and nucleic acid template to a pH between 7.0 and 13.0, between 7.5 and 12.5, between 8.0 and 12.0, between 8.5 and 11.5, between 9.0 and 11.0, between 9.5 and 10.5, between 9.8 and 10.2, between 7.0 and 10.0, between 7.5 and 9.5, between 8.0 and 9.0, between 10.0 and 13.0, between 10.5 and 12.5, or between 11.0 and 12.0. In various embodiments, methods disclosed herein further comprise pooling the dissociated nucleic acid epitype probe with one or more other nucleic acid epitype probes, wherein the one or more other nucleic acid epitype probes were dissociated from other nucleic acid templates. In various embodiments, the epitype probe and the one or more other nucleic acid epitype probes each comprise different barcodes. [0009] In various embodiments, methods disclosed herein further comprise amplifying the dissociated nucleic acid epitype probe. In various embodiments, methods disclosed herein further comprise demultiplexing sequencing data from the nucleic acid epitype probe and the one or more other nucleic acid epitype probes using the differing barcodes of the nucleic acid epitype probe and one or more other nucleic acid epitype probes. In various embodiments, methods disclosed herein further comprise: prior to providing the nucleic acid epitype probe, performing conversion of cell-free DNA obtained from the biological sample of the subject. In various embodiments, the converted cell-free DNA comprises bi-sulfite converted cell-free DNA. In various embodiments, the biological sample of the subject is a blood sample. [0010] In various embodiments, methods disclosed herein further comprise: providing one or more additional nucleic acid epitype probes, wherein one of the additional nucleic acid epitype probe comprises a sequence that differs from the sequence of the nucleic acid epitype probe by one nucleotide. In various embodiments, the one nucleotide difference is a G Æ A substitution. In various embodiments, the one or more additional nucleic acid epitype probes do not hybridize with the nucleic acid template. In various embodiments, the one or more additional nucleic acid epitype probes comprise (2 ^ െ 1) additional nucleic acid epitype probes, wherein X represents a total number of CpG sites in a sequence of the cell-free DNA. In various embodiments, each of the (2 ^ െ 1) additional nucleic acid epitype probes comprises one or more of a biotin moiety, a fluorescent tag, or a barcode. In various embodiments, the nucleic acid epitype probe and at least one of the (2 ^ െ 1) additional nucleic acid epitype probes comprise a common barcode sequence. In various embodiments, providing the nucleic acid epitype probe and providing one or more additional nucleic acid epitype probes occurs simultaneously. [0011] Additionally disclosed herein is a method of detecting a nucleic acid epitype, comprising: providing a nucleic acid epitype probe designed to be complementary to a converted nucleic acid epitype, wherein the converted nucleic acid epitype comprises one or more CpG sites that, prior to conversion, were non-methylated, partially methylated, or fully methylated; contacting a nucleic acid template derived from converted cell-free DNA obtained from a biological sample of a subject with the nucleic acid epitype probe in the presence of a hybridization solution that selectively raises the stability of A:T base pairs to substantially the same stability of G:C base pairs, wherein the epitype probe hybridizes to the nucleic acid template if the epitype probe is complementary to the nucleic acid template; amplifying the nucleic acid template using the nucleic acid epitype probe as an amplification primer, and detecting the nucleic acid epitype by detecting a signal indicative of presence of an amplification product generated by amplifying the nucleic acid template. [0012] In various embodiments, amplifying the nucleic acid template comprises performing polymerase chain reaction. In various embodiments, detecting the signal indicative of the amplification product comprises detecting a fluorescent signal. In various embodiments, each of the one or more CpG sites are selected from a CpG site in a CpG island (CGI) shown in any of Tables 1-4. In various embodiments, detecting the nucleic acid epitype further comprises determining a methylation status of the nucleic acid epitype based on the presence of the amplification product. In various embodiments, the methylation status of the nucleic acid epitype is one of non-methylated, partially methylated, or fully methylated. In various embodiments, the hybridization solution comprises tetramethylammonium chloride (TMAC). In various embodiments, detecting the nucleic acid epitype further comprises determining a number of amplification cycles until the signal indicative of presence of the amplification product was detected. In various embodiments, detecting the nucleic acid epitype further comprises comparing the number of amplification cycles to a number of amplification cycles until a corresponding signal was detected in a control sample. [0013] Additionally disclosed is a method for detecting circulating tumor DNA in a biological sample of a subject, the method comprising: providing a nucleic acid epitype probe designed to be complementary to a converted nucleic acid epitype, wherein the converted nucleic acid epitype comprises one or more CpG sites that, prior to conversion, were non-methylated, partially methylated, or fully methylated; contacting a nucleic acid template derived from converted cell-free DNA obtained from a biological sample of a subject with the nucleic acid epitype probe in the presence of a hybridization solution that selectively raises the stability of A:T base pairs to substantially the same stability of G:C base pairs, wherein the epitype probe hybridizes to the nucleic acid template if the epitype probe is complementary to the nucleic acid template; and detecting the circulating tumor DNA by detecting the nucleic acid epitype probe that hybridized to the nucleic acid template. [0014] In various embodiments, detecting the nucleic acid epitype probe comprises sequencing the epitype probe to determine the identity of the nucleic acid epitype. In various embodiments, each of the one or more CpG sites are selected from a CpG site in a CpG island (CGI) shown in any of Tables 1-4. In various embodiments, detecting the nucleic acid epitype comprises determining a methylation status of the nucleic acid epitype based on the detected nucleic acid epitype probe that hybridized to the nucleic acid template. In various embodiments, the methylation status of the nucleic acid epitype is one of non-methylated, partially methylated, or fully methylated. In various embodiments, the hybridization solution comprises tetramethylammonium chloride (TMAC). In various embodiments, the nucleic acid epitype probe comprises a binding moiety that binds to a solid support. In various embodiments, the binding moiety comprises a biotin moiety. In various embodiments, the nucleic acid epitype probe comprises a detection moiety. In various embodiments, the detection moiety comprises a fluorescent tag. In various embodiments, the nucleic acid epitype probe comprises a barcode. [0015] In various embodiments, methods disclosed herein further comprise isolating the nucleic acid template hybridized to the nucleic acid epitype probe. In various embodiments, isolating the nucleic acid template hybridized to the nucleic acid epitype probe comprises exposing the binding moiety to the solid support, and separating the solid support from non-specifically associated nucleic acids. In various embodiments, isolating the nucleic acid template hybridized to the nucleic acid epitype probe comprises performing a streptavidin bead pulldown. In various embodiments, isolating the nucleic acid template hybridized to the nucleic acid epitype probe further comprises enriching for the nucleic acid template hybridized to the nucleic acid epitype probe. In various embodiments, methods disclosed herein enriching for the nucleic acid template hybridized to the nucleic acid epitype probe further comprises performing a wash to remove non- specifically associated nucleic acids. [0016] In various embodiments, methods disclosed herein further comprise: subsequent to isolating the nucleic acid template hybridized to the nucleic acid epitype probe and prior to detecting the nucleic acid epitype, dissociating the nucleic acid epitype probe from the nucleic acid template. In various embodiments, dissociating the nucleic acid epitype probe from the nucleic acid template comprises exposing the nucleic acid epitype probe and nucleic acid template to a temperature between 40 o C and 100 o C, between 45 o C and 95 o C, between 50 o C and 90 o C, between 55 o C and 90 o C, between 60 o C and 85 o C, between 65 o C and 80 o C, between 70 o C and 75 o C, between 45 o C and 75 o C, between 50 o C and 70 o C, or between 55 o C and 65 o C. In various embodiments, dissociating the nucleic acid epitype probe from the nucleic acid template comprises exposing the nucleic acid epitype probe and nucleic acid template to a pH between 7.0 and 13.0, between 7.5 and 12.5, between 8.0 and 12.0, between 8.5 and 11.5, between 9.0 and 11.0, between 9.5 and 10.5, between 9.8 and 10.2, between 7.0 and 10.0, between 7.5 and 9.5, between 8.0 and 9.0, between 10.0 and 13.0, between 10.5 and 12.5, or between 11.0 and 12.0. In various embodiments, methods disclosed herein further comprise pooling the dissociated nucleic acid epitype probe with one or more other nucleic acid epitype probes, wherein the one or more other nucleic acid epitype probes were dissociated from other one or more other nucleic acid templates. In various embodiments, the epitype probe and the one or more other nucleic acid epitype probes each comprise different barcodes. [0017] In various embodiments, methods disclosed herein further comprise amplifying the dissociated nucleic acid epitype probe. In various embodiments, methods disclosed herein further comprise demultiplexing sequencing data from the nucleic acid epitype probe and the one or more other nucleic acid epitype probes using the differing barcodes of the nucleic acid epitype probe and one or more other nucleic acid epitype probes. In various embodiments, methods disclosed herein further comprise: prior to providing the nucleic acid epitype probe, performing conversion of cell-free DNA obtained from the biological sample of the subject. In various embodiments, the converted cell-free DNA comprises bi-sulfite converted cell-free DNA. In various embodiments, the biological sample of the subject is a blood sample. [0018] In various embodiments, methods disclosed herein further comprise: providing one or more additional nucleic acid epitype probes, wherein one of the additional nucleic acid epitype probe comprises a sequence that differs from the sequence of the nucleic acid epitype probe by one nucleotide. In various embodiments, the one nucleotide difference is a G A substitution. In various embodiments, the one or more additional nucleic acid epitype probes do not hybridize with the nucleic acid template. In various embodiments, the one or more additional nucleic acid epitype probes comprise (2 ^ െ 1) additional nucleic acid epitype probes, wherein X represents a total number of CpG sites in a sequence of the cell-free DNA. In various embodiments, each of the (2 ^ െ 1) additional nucleic acid epitype probes comprises one or more of a biotin moiety, a fluorescent tag, or a barcode. In various embodiments, the nucleic acid epitype probe and at least one of the (2 ^ െ 1) additional nucleic acid epitype probes comprise a common barcode sequence. In various embodiments, providing the nucleic acid epitype probe and providing one or more additional nucleic acid epitype probes occurs simultaneously. [0019] Additionally disclosed herein is a method for detecting circulating tumor DNA in a biological sample of a subject, the method comprising: providing a nucleic acid epitype probe designed to be complementary to a converted nucleic acid epitype, wherein the converted nucleic acid epitype comprises one or more CpG sites that, prior to conversion, were non-methylated, partially methylated, or fully methylated; contacting a nucleic acid template derived from converted cell-free DNA obtained from a biological sample of a subject with the nucleic acid epitype probe in the presence of a hybridization solution that selectively raises the stability of A:T base pairs to substantially the same stability of G:C base pairs, wherein the epitype probe hybridizes to the nucleic acid template if the epitype probe is complementary to the nucleic acid template; amplifying the nucleic acid template using the nucleic acid epitype probe as an amplification primer, and detecting the circulating tumor DNA by detecting a signal indicative of presence of an amplification product generated by amplifying the nucleic acid template. [0020] In various embodiments, amplifying the nucleic acid template comprises performing polymerase chain reaction. In various embodiments, detecting the signal indicative of the amplification product comprises detecting a fluorescent signal. In various embodiments, each of the one or more CpG sites are selected from a CpG site in a CpG island (CGI) shown in any of Tables 1-4. In various embodiments, detecting the nucleic acid epitype further comprises determining a methylation status of the nucleic acid epitype based on the presence of the amplification product. In various embodiments, the methylation status of the nucleic acid epitype is one of non-methylated, partially methylated, or fully methylated. In various embodiments, the hybridization solution comprises tetramethylammonium chloride (TMAC). In various embodiments, detecting the nucleic acid epitype further comprises determining a number of amplification cycles until the signal indicative of presence of the amplification product was detected. In various embodiments, detecting the nucleic acid epitype further comprises comparing the number of amplification cycles to a number of amplification cycles until a corresponding signal was detected in a control sample. [0021] Additionally disclosed herein is a composition comprising: a nucleic acid template derived from bisulfite converted cell-free DNA obtained from a biological sample of a subject, wherein prior to conversion, the cell-free DNA comprises a sequence between 50-500 nucleotides, between 75-400 nucleotides, between 100-300 nucleotides, between 125-250 nucleotides, or between 150-200 nucleotides of a CpG island (CGI), wherein between 0 and X cytosines of the sequence of the cell-free DNA are converted to a uracil in the nucleic acid template, wherein X represents a total number of CpG sites in the sequence of the cell-free DNA; and a nucleic acid epitype probe hybridized to the nucleic acid template, wherein the nucleic acid epitype probe comprises a sequence complementary to the sequence of the nucleic acid template. [0022] Additionally disclosed herein is a composition comprising a nucleic acid epitype probe comprising: a nucleic acid sequence complementary to a sequence of a nucleic acid template derived from bisulfite converted cell-free DNA obtained from a biological sample of a subject, wherein prior to conversion, the cell-free DNA comprises a sequence between 50-500 nucleotides, between 75-400 nucleotides, between 100-300 nucleotides, between 125-250 nucleotides, or between 150-200 nucleotides of a CpG island (CGI), and a binding moiety that binds to a solid support, a detection moiety, and/or a barcode. [0023] In various embodiments, the CpG island is selected from a CpG island shown in Tables 1-4. In various embodiments, the composition further comprises a hybridization solution. In various embodiments, the hybridization solution comprises tetramethylammonium chloride (TMAC). In various embodiments, the nucleic acid epitype probe comprises a binding moiety that binds to a solid support. In various embodiments, the binding moiety comprises a biotin moiety. In various embodiments, the nucleic acid epitype probe comprises a detection moiety. In various embodiments, the detection moiety comprises a fluorescent tag. In various embodiments, the nucleic acid epitype probe comprises a barcode. In various embodiments, the composition further comprises a bead non-covalently linked to the nucleic acid template. In various embodiments, the composition further comprises one or more additional nucleic acid epitype probes, wherein one of the additional nucleic acid epitype probe comprises a sequence that differs from the sequence of the nucleic acid epitype probe by one nucleotide. In various embodiments, the one nucleotide difference is a G Æ A substitution. In various embodiments, the one or more additional nucleic acid epitype probes are not hybridized with the nucleic acid template. In various embodiments, the one or more additional nucleic acid epitype probes comprise (2 ^ െ 1) additional nucleic acid epitype probes, wherein X represents a total number of CpG sites in the sequence of corresponding cell-free DNA. In various embodiments, each of the (2 ^ െ 1) additional nucleic acid epitype probes comprises a biotin moiety. In various embodiments, each of the (2 ^ െ 1) additional nucleic acid epitype probes comprises a fluorescent tag. In various embodiments, each of the (2 ^ െ 1) additional nucleic acid epitype probes comprises a barcode. BRIEF DESCRIPTION OF THE DRAWINGS [0024] These and other features, aspects, and advantages of the present invention will become better understood with regard to the following description and accompanying drawings. It is noted that wherever practicable, similar or like reference numbers may be used in the figures and may indicate similar or like functionality. For example, a letter after a reference numeral, such as “nucleic acid epitype probe 310A,” indicates that the text refers specifically to the element having that particular reference numeral. A reference numeral in the text without a following letter, such as “nucleic acid epitype probe 310,” refers to any or all of the elements in the figures bearing that reference numeral (e.g., “nucleic acid epitype probe 310” in the text refers to reference numerals “nucleic acid epitype probe 310A” and/or “nucleic acid epitype probe 310B” in the figures). [0025] Figure (FIG.) 1 depicts an overall flow process for detecting a nucleic acid epitype, in accordance with an embodiment. [0026] FIG.2A depicts an example conversion of nucleic acids, in accordance with an embodiment. [0027] FIG.2B shows the results of nitrite conversion on select nucleotides, in accordance with a second embodiment. Figure adapted from Li et al. (2022) Genome Biology 23:122. [0028] FIG.3A depicts an example provision of nucleic acid epitype probes, in accordance with an embodiment. [0029] FIG.3B depicts example hybridization of a nucleic acid epitype probe to a nucleic acid template, in accordance with an embodiment. [0030] FIGs.4A, 4B, and 4C depict example nucleic acid epitype probes, in accordance with different embodiments. [0031] FIG.5A depicts enrichment of the nucleic acid epitype probe hybridized to the nucleic acid template, in accordance with an embodiment. [0032] FIG.5B depicts an example dissociation of the nucleic acid epitype probe from the nucleic acid template, in accordance with an embodiment. [0033] FIG.5C depicts subsequent processing of a nucleic acid epitype probe, including amplification and sequencing of the nucleic acid epitype probe, in accordance with an embodiment. [0034] FIG.6 shows an example process for amplifying and detecting a nucleic acid epitype, in accordance with an embodiment. [0035] FIG.7 shows an example process for detecting a nucleic acid epitype. DETAILED DESCRIPTION Definitions [0036] Terms used in the claims and specification are defined as set forth below unless otherwise specified. [0037] The term “about” refers to a value that is within 10% above or below the value being described. For example, the term “about 5 nM” indicates a range of from 4.5 nM to 5.5 nM. [0038] The terms “subject,” “patient,” and “individual” are used interchangeably and encompass a cell, tissue, or organism, human or non-human, male or female. [0039] The term “sample” can include a single cell or multiple cells or fragments of cells or an aliquot of body fluid, such as a blood sample, taken from a subject, by means including venipuncture, excretion, ejaculation, massage, biopsy, needle aspirate, lavage sample, scraping, surgical incision, or intervention or other means known in the art. Examples of an aliquot of body fluid include amniotic fluid, aqueous humor, bile, lymph, breast milk, interstitial fluid, blood, blood plasma, cerumen (earwax), Cowper’s fluid (pre-ejaculatory fluid), chyle, chyme, female ejaculate, menses, mucus, saliva, urine, vomit, tears, vaginal lubrication, sweat, serum, semen, sebum, pus, pleural fluid, cerebrospinal fluid, synovial fluid, intracellular fluid, and vitreous humour. [0040] The term “epitype” or “nucleic acid epitype” refer to a region of nucleic acid (i.e., DNA or RNA) containing an epigenetic variation. For example, the epigenetic variation could be methylation or non-methylation of one or more nucleotides in a region of nucleic acid. For instance, in some embodiments the nucleotide that could be methylated or non-methylated may be a cytidine, e.g., at a CpG site (e.g., the nucleotide could be 5-methylcytidine or cytidine). Exemplary CpG sites may be found in, for example, CpG islands (CGIs) shown in Tables 1-4. CpG islands (CGIs) may be regions having a length greater than 200 bp, a GC content greater than 50% and a ratio of observed to expected CpG greater than 0.6. CpG islands are often found in promoter regions, where methylation is associated with transcriptional repression. Generally, a nucleic acid epitype containing one or more CpG sites may have a methylation pattern, such as any of fully non-methylated (e.g., none of the CpG sites in the epitype are methylated), partially methylated (e.g., at least one but not all of the CpG sites in the epitype are methylated), or fully methylated (e.g., all of the CpG sites in the epitype are methylated). In other embodiments, the nucleotide that could be methylated or non-methylated may be adenosine (e.g., the nucleotide could be N6-methyladenosine or adenosine). Overview [0041] Disclosed herein are methods and compositions useful for determining nucleic acid epitypes. As referred to herein, a nucleic acid epitype refers to a region of nucleic acid containing one or more epigenetic variations, such as methylation or non-methylation of one or more nucleotides, e.g., at cytidine residues within CpG sites. Thus, in various embodiments, methods and compositions disclosed herein are useful for determining statuses (e.g., methylation statuses) of the one or more CpG sites in the nucleic acid epitype. For example, methods and compositions disclosed herein can be used to determine whether a nucleic acid epitype includes one or more CpG sites that are fully non-methylated, partially methylated, or fully methylated. In various embodiments, determining a nucleic acid epitype can be useful for performing screens, e.g., for determining whether the sample obtained from a subject is at risk or not at risk for a health condition. In various embodiments, determining a nucleic acid epitype can be useful for detecting presence or absence of circulating tumor DNA in the sample obtained from a subject. [0042] In particular embodiments, disclosed herein are compositions comprising a nucleic acid epitype probe. In various embodiments, a nucleic acid epitype probe is designed to be complementary to a sequence of a converted nucleic acid epitype (e.g., bisulfite-converted nucleic acid epitype), the sequence comprising one or more CpG sites that, prior to conversion, were one of non-methylated, partially methylated, or fully methylated. In various embodiments, different nucleic acid epitype probes can be designed to be fully complementary to the sequence a converted nucleic acid epitype, depending on the prior methylation statuses of the one or more CpG sites of the converted nucleic acid epitype. For example, given ^ CpG sites in the converted nucleic acid epitype, 2 ^ different nucleic acid epitype probes can be designed such that one of the different nucleic acid epitype probes is fully complementary to the sequence of the ^ CpG sites of the converted nucleic acid epitype. Thus, by detecting the nucleic acid epitype probe that hybridized with the sequence of the converted nucleic acid epitype, the methylation statuses of the CpG sites of the nucleic acid epitype can be detected. [0043] FIG.1 depicts an overall flow process 100 for detecting a nucleic acid epitype, in accordance with an embodiment. Although FIG.1 shows the flow process in relation to a single subject 110, in various embodiments, the flow process can be performed for more than a single subject 110 (e.g., for thousands, millions, tens of millions, or hundreds of millions of subjects). [0044] As shown in FIG.1, step 115 involves obtaining a sample from the subject 110. In various embodiments, a sample is any of a blood sample, a stool sample, a urine sample, a mucous sample, or a saliva sample. In particular embodiments, a sample obtained from the subject 110 is a blood sample. The sample can be obtained by the subject or by a third party, e.g., a medical professional. Examples of medical professionals include physicians, emergency medical technicians, nurses, first responders, psychologists, phlebotomists, medical physics personnel, nurse practitioners, surgeons, dentists, and any other medical professional as would be known to one skilled in the art. In various embodiments, the one or more samples can be obtained from the subject 110 by a reference lab. [0045] In various embodiments, the sample obtained from the subject is a liquid biopsy sample. In various embodiments, the liquid biopsy sample may include various biomarkers, examples of which include proteins, metabolites, and/or nucleic acids. In particular embodiments, the liquid biopsy sample includes cell-free DNA (cfDNA). In particular embodiments, the cfDNA includes genomic sequences corresponding to CpG islands (CGIs) for which methylation states are informative of a health condition. In various embodiments, the cfDNA can be derived from tumor cells and is referred to herein as circulating tumor DNA (ctDNA). [0046] Step 120 involves converting the nucleic acid in the sample obtained from the subject. In various embodiments, converting the nucleic acid involves converting unmethylated nucleotides (e.g., cytosines) to another nucleotide (a “converted nucleotide”, as used herein). In various embodiments, methylated cytosines are protected from conversion (e.g., deamination) during the conversion step. This enables subsequent downstream differentiation of methylated cytosines and unmethylated cytosines for determining nucleic acid epitypes. Further details of step 120 are described herein. [0047] Although not shown in FIG.1, in various embodiments, after conversion of nucleic acids, the converted nucleic acids undergo library construction. In various embodiments, converted nucleic acids can undergo end-repairing and/or addition of library or sequencing adapters. In various embodiments, converted nucleic acids can undergo biotinylation (e.g., addition of biotin moieties to converted nucleic acids). In various embodiments, barcodes can be incorporated into converted nucleic acids, thereby enabling subsequent sample demultiplexing (e.g., demultiplexing to identify sources of converted nucleic acids or demultiplexing to identify a common source from converted nucleic acids). As used herein, a “nucleic acid template” refers to a nucleic acid derived from the converted nucleic acid (e.g., any of a nucleic acid derived from a converted nucleic acid that underwent library construction, end-repairing, addition of library or sequencing adapters, biotinylation, barcode addition, or any combination thereof). [0048] Step 125 involves providing nucleic acid epitype probes. In various embodiments, nucleic acid epitype probes are designed to interrogate the full range of possible CpG methylation statuses of a nucleic acid epitype. For example, given X CpG sites within a nucleic acid epitype (each CpG site having a status of either methylated or non-methylated), then the full range of possible CpG methylation statuses of the nucleic acid epitype is 2 ^ . Thus, in various embodiments, step 125 involves providing at least 2 ^ nucleic acid epitype probes to nucleic acid templates derived from the converted nucleic acid. The particular nucleic acid epitype probe that hybridizes with a sequence of the nucleic acid template is indicative of the methylation statuses of the X CpG sites within the nucleic acid epitype. Further details of step 125 are described herein. [0049] Step 130 involves processing a nucleic acid template derived from the converted that is hybridized to a nucleic acid epitype probe. In various embodiments, processing a nucleic acid template in step 130 involves isolating the nucleic acid template hybridized to the nucleic acid epitype probe. In various embodiments, processing a nucleic acid template in step 130 involves enriching for the nucleic acid template hybridized to the nucleic acid epitype probe. In various embodiments, processing a nucleic acid template in step 130 involves dissociating the nucleic acid epitype probe from the nucleic acid template. In various embodiments, processing a nucleic acid template in step 130 involves amplifying the nucleic acid epitype probe. In various embodiments, processing a nucleic acid template in step 130 involves amplifying the nucleic acid template using the nucleic acid epitype probe as a primer. Further details of step 130 are described herein. [0050] Step 135 involves detecting the nucleic acid epitype by detecting the nucleic acid epitype probe that hybridized to the nucleic acid template. In various embodiments, detecting the nucleic acid epitype probe involves amplifying and sequencing the nucleic acid epitype probe. By determining the sequence of the nucleic acid epitype probe, the complementary sequence of the nucleic acid epitype, including the sequences of the CpG sites of the nucleic acid epitype, can be determined. Thus, this enables detection of the nucleic acid epitype, including the methylation statuses of the CpG sites of the nucleic acid epitype. In various embodiments, detecting the nucleic acid epitype probe involves detecting a signal of the nucleic acid epitype probe, such as a fluorescent signal. For example, with real-time PCR, fluorescent dyes of nucleic acid epitype probes can be used to label generated amplicons derived from the nucleic acid template. Thus, detection of the signal (e.g., fluorescent signal) is indicative of the presence of the generated amplicons derived from the nucleic acid template. Further details of step 135 are described herein. [0051] In various embodiments, detecting the nucleic acid epitype is useful for determining whether a subject is not at risk for a health condition. For example, given particular methylation statuses of CpG sites in a nucleic acid epitype, a subject can be determined to be at risk or not at risk for a health condition. In various embodiments, subjects that have not been identified as not at risk of the health condition can undergo additional analysis (e.g., reflex test). For example, subjects not identified as not at risk can be candidate subjects who are selected for enrollment in a clinical trial. Thus, methods disclosed herein enable the accurate identification of individuals (from amongst a large patient population) who may be at risk of having a health condition and therefore, meet the eligibility criteria for enrollment in a clinical trial. Example methods for converting nucleic acids [0052] As discussed herein, step 120 in FIG.1 involves converting nucleic acids from the obtained sample. In various embodiments, converting nucleic acids includes treating the nucleic acids to capture methylation modifications. In various embodiments, converting nucleic acids involves converting one or more unmethylated nucleotides (e.g., cytosines) to another nucleotide (a “converted nucleotide”, as used herein), e.g., using chemical or enzymatic means. In certain embodiments, one or more unmethylated cytosines are converted to a nucleotide that pairs with adenine (e.g., the unmethylated cytosine may be converted to uracil). In certain embodiments, one or more unmethylated adenines are converted to a base that pairs with cytosine (e.g., the unmethylated adenine may be converted to inosine (I)). In certain embodiments, one or more methylated cytosines (e.g., a 5-methylcytosine (5mC)) is converted to a thymine, which pairs with adenine. In certain embodiments, methylated cytosines are protected from conversion (e.g., deamination) during the conversion step. [0053] After a nucleic acid has been treated to convert unmethylated, or, in some cases, methylated nucleotides, into another nucleotide, the nucleic acid may be amplified. During amplification, the converted nucleotide pairs with its complementary nucleotide, and in the next round of amplification, the complementary nucleotide pairs with a replacement nucleotide. For example, following the conversion of an unmethylated cytosine to a uracil, the nucleic acid may be amplified such that an adenine pairs with the uracil in the first round of replication, and in the second round of replication, the adenine pairs with a thymine. Accordingly, the thymine replaces the uracil in the original nucleic acid sequence, and is referred to herein as a “replacement nucleotide”. [0054] In certain aspects, conversion of the nucleic acids involves selectively deaminating nucleotides. FIG. 2 depicts an example conversion of nucleic acids, in accordance with an embodiment. Selective deamination refers to a process in which unmethylated cytosine residues are selectively deaminated over methylated cytosine (5-methylcytosine) residues. In certain embodiments, deamination of cytosine forms uracil, effectively inducing a C to T point mutation to allow for detection of methylated cytosines. Methods of deaminating cytosine are known in the art, and include chemical conversion (e.g., bisulfite conversion) and enzymatic conversion. In certain embodiments, the enzymatic conversion comprises subjecting the nucleic acid to TET2, which oxidizes methylated cytosines, thereby protecting them, and subsequent exposure to APOBEC, which converts unprotected (i.e., unmethylated) cytosines to uracils. [0055] In some embodiments, the conversion, for example, bisulfite conversion or enzymatic conversion, uses commercially available kits. Bisulfite conversion can be performed using commercially available technologies, such as EZ DNA Methylation-Gold, EZ DNAMethylation- Direct or an EZ DNAMethylation-Lighting kit (Zymo Research Corp (Irvine, California)) or EpiTect Fast available from Qiagen (Germantown, MD). In another example a kit such as APOBECSeq (NEBiolabs) or OneStep qMethyl-PCR Kit (Zymo Research Corp (Irvine, California)) is used. i. Bisulfite conversion [0056] Bisulfite conversion is performed on DNA by denaturation using high heat, preferential deamination (at an acidic pH) of unmethylated cytosines, which are then converted to uracil by desulfonation (at an alkaline pH). Methylated cytosines remain unchanged on the single- stranded DNA (ssDNA) product. [0057] In some embodiments the methods include treatment of the sample with bisulfite (e.g., sodium bisulfite, potassium bisulfite, ammonium bisulfite, magnesium bisulfite, sodium metabisulfite, potassium metabisulfite, ammonium metabisulfite, magnesium metabisulfite and the like). Unmethylated cytosine is converted to uracil through a three-step process during sodium bisulfite modification. As shown in FIG. 2, the steps are sulphonation to convert cytosine to cytosine sulphonate, deamination to convert cytosine sulphonate to uracil sulphonate and alkali desulphonation to convert uracil sulphonate to uracil. Conversion on methylated cytosine is much slower and is not observed at significant levels in a 4-16 hour reaction. (See Clark et al., Nucleic Acids Res., 22(15):2990-7 (1994).) If the cytosine is methylated it will remain a methylated cytosine. If the cytosine is unmethylated it will be converted to uracil. When the modified strand is copied, for example, through extension of a locus specific primer, a random or degenerate primer or a primer to an adaptor, a G will be incorporated in the interrogation position (opposite the C being interrogated) if the C was methylated and an A will be incorporated in the interrogation position if the C was unmethylated and converted to U. When the double stranded extension product is amplified those Cs that were converted to Us and resulted in incorporation of A in the extended primer will be replaced by Ts during amplification. Those Cs that were not converted (i.e., the methylated Cs) and resulted in the incorporation of G will be replaced by unmethylated Cs during amplification. ii. Enzymatic conversion [0058] In certain embodiments, the enzymatic treatment with a cytidine deaminase enzyme is used to convert cytosine to uracil. Enzymatic conversion can include an oxidation step, in which Tet methylcytosine dioxygenase 2 (TET2) catalyzes the oxidation of 5mC to 5hmC to protect methylated cytosines from conversion by subsequent exposure to a cytidine deaminase. Other protection steps known in the art can be used in addition to or in place of oxidation by TET2. After the oxidation step, the nucleic acid is treated with the cytidine deaminase to convert one or more unmethylated cytosines to uracils. As with bisulfite conversion, when the modified strand is copied, a G will be incorporated in the interrogation position (opposite the C being interrogated) if the C was methylated and an A will be incorporated in the interrogation position if the C was unmethylated. When the double stranded extension product is amplified those Cs that were converted to Us and resulted in incorporation of A in the extended primer will be replaced by Ts during amplification. Those Cs that were not modified and resulted in the incorporation of G will remain as C. [0059] In certain embodiments the cytidine deaminase may be APOBEC. In certain embodiments the cytidine deaminase includes activation induced cytidine deaminase (AID) and apolipoprotein B mRNA editing enzymes, catalytic polypeptide-like (APOBEC). In certain embodiments, the APOBEC enzyme is selected from the human APOBEC family consisting of: APOBEC-1 (Apo1), APOBEC-2 (Apo2), AID, APOBEC-3A, -3B, -3C, -3DE, -3F, -3G, -3H and APOBEC-4 (Apo4). In certain embodiments, the APOBEC enzyme is APOBEC-seq. iii. Nitrite Conversion [0060] In certain embodiments, nitrite treatment is used to deaminate adenine and cytosine. As shown in FIG.2B, deamination of an A results in conversion to an inosine (I), which is read by a polymerase as a G, whereas deamination of a methylated A (N 6 -methyladenine (6mA)) results in a nitrosylated 6mA (6mA-NO), which causes the base to be read by a polymerase as an A. Deamination of a C results in conversion to a uracil, which is read by a polymerase as a T, whereas deamination of a N 4 -methylcytosine (4mC) to 4mC-NO or a 5-methylcytosine (5mC) to a T causes the base to be read by a polymerase as a C or a T, respectively. For 5mC bases, the C to T ratio at the 5mC position is about 40% higher than other cytosine positions, allowing 5mC to be differentiated from C. (See, Li et al. (2022) Genome Biology 23:122.) Example provision of nucleic acid epitype probes [0061] As discussed herein, step 125 in FIG.1 involves providing nucleic acid epitype probes (e.g., providing nucleic acid epitype probes to nucleic acid templates derived from converted nucleic acids). In various embodiments, a nucleic acid epitype probe refers to a nucleic acid sequence that is complementary to a sequence of a converted nucleic acid epitype, wherein the converted nucleic acid epitype comprises one or more CpG sites that, prior to conversion, were non-methylated, partially methylated, or fully methylated. In various embodiments, a nucleic acid epitype probe comprises at least 50 nucleotides, at least 100 nucleotides, at least 150 nucleotides, at least 200 nucleotides, at least 250 nucleotides, at least 300 nucleotides, at least 350 nucleotides, at least 400 nucleotides, at least 450 nucleotides, at least 500 nucleotides, at least 550 nucleotides, at least 600 nucleotides, at least 650 nucleotides, at least 700 nucleotides, at least 750 nucleotides, at least 800 nucleotides, at least 850 nucleotides, at least 900 nucleotides, at least 950 nucleotides, or at least 1000 nucleotides. In various embodiments, a nucleic acid epitype probe comprises between 10 and 1000 nucleotides, between 20 and 900 nucleotides, between 30 and 800 nucleotides, between 40 and 700 nucleotides, between 50 and 600 nucleotides, between 60 and 500 nucleotides, between 70 and 400 nucleotides, between 80 and 300 nucleotides, between 90 and 200 nucleotides, between 100 and 190 nucleotides, between 110 and 180 nucleotides, between 120 and 170 nucleotides, between 130 and 160 nucleotides, or between 140 and 155 nucleotides. [0062] In various embodiments, a nucleic acid template is derived from cell-free DNA that has undergone conversion. In particular embodiments, a nucleic acid template is derived from bisulfite converted cell-free DNA (e.g., obtained from a biological sample of a subject). For example, a nucleic acid template may comprise bisulfite converted cell-free DNA that underwent library construction (e.g., addition of one or more adapters) and/or biotinylation. In various embodiments, a sequence of the bisulfite converted cell-free DNA may match a sequence of the nucleic acid template, wherein the nucleic acid template further includes one or more adapters and/or a binding moiety (e.g., a biotin moiety). In some embodiments, a sequence of the bisulfite converted cell-free DNA may not exactly match a sequence of the nucleic acid template. For example, in a scenario where the bisulfite converted cell-free DNA undergoes amplification, replacement nucleotides may be incorporated such that uracil nucleobases in the bisulfite converted cell-free DNA are replaced by thymine nucleobases in the nucleic acid template. [0063] In various embodiments, prior to undergoing conversion (e.g., bisulfite conversion), the cell-free DNA comprises a sequence between 50-500 nucleotides of a CpG island (CGI) shown in Tables 1-4. In various embodiments, the cell-free DNA comprises a sequence between 75-400 nucleotides, between 100-300 nucleotides, between 125-250 nucleotides, or between 150-200 nucleotides of a CpG island (CGI) shown in Tables 1-4. [0064] In various embodiments, the cell-free DNA may comprise a sequence with X total CpG sites. In various embodiments, a region of the cell-free DNA (e.g., a nucleic acid epitype) may comprise a sequence with X total CpG sites. In various embodiments, the number of CpG sites, X, within a nucleic acid epitype comprises at least 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, or 100 CpG sites. In various embodiments, the number of CpG sites X within a nucleic acid epitype comprises at least 100, 110, 120, 130, 140, 150, 160, 170, 180, 190, 200, 225, 250, 275, 300, 350, 400, 450, 500, 550, 600, 650, 700, 750, 800, 850, 900, 950, 1000, 1500, 2000, or 2500 CpG sites. [0065] In various embodiments, after the cell-free DNA undergoes conversion (e.g., bisulfite conversion), between 0 and X cytosines of the sequence of the cell-free DNA are converted to a uracil. Thus, the resulting nucleic acid template may have between 0 and X uracil bases that were converted from cytosines. [0066] Generally, a sufficient number of different epitype probes are designed and provided to interrogate the full range of possible methylation statuses of CpG sites of a nucleic acid epitype. For example, if there are X CpG sites within a nucleic acid epitype, which gives rise to 2 ^ possible CpG methylation statuses, then 2 ^ nucleic acid epitype probes are provided. In various embodiments, CpG sites are found in CpG islands (CGI) which are regions with high frequency of CpG sites. Example CGIs include, but are not limited to, the CGIs shown in the accompanying tables (referred to herein as Tables 1-4) which lists, for each CGI, its respective location in the human genome. Additional example CGIs are disclosed in WO2018209361 (see Table 1) and WO2022133315 (see Table 2 entitled “TOO Methylation Sites” and Table 3 entitled “Pan Cancer Methylation Sites”), each of which is hereby incorporated by reference in its entirety. [0067] As one example, the number of CpG sites, X, in a nucleic acid epitype is 1. Therefore, at least 2 different nucleic acid epitype probes are provided to differentiate between a nucleic acid template corresponding to a methylated CpG site and a nucleic acid template corresponding to a non-methylated CpG site. In various embodiments, X is 3. Therefore, at least 8 different nucleic acid epitype probes are provided to differentiate between the 8 different possible methylation statuses of the 3 CpG sites (e.g., 8 possible statuses include M/M/M, M/M/U, M/U/M, U/M/M, M/U/U, U/M/U, U/U/M, or U/U/U where “M” indicates methylated and “U” indicates unmethylated). Here, the specific nucleic acid epitype probe that is fully complementary with a sequence of the converted nucleic acid is indicative of the methylation statuses of the X CpG sites within the nucleic acid epitype. [0068] In various embodiments, one out of the 2 ^ different nucleic acid epitype probes will be fully complementary to a sequence of the nucleic acid template. Put another way, a nucleic acid epitype probe comprises a nucleic acid sequence complementary to a sequence of a nucleic acid template derived from bisulfite converted cell-free DNA obtained from a biological sample of a subject. Here, prior to conversion, the cell-free DNA comprises a sequence between 50-500 nucleotides, between 75-400 nucleotides, between 100-300 nucleotides, between 125-250 nucleotides, or between 150-200 nucleotides of a CpG island (CGI) shown in Tables 1-4. [0069] Generally, as described above, nucleic acid epitype probes disclosed herein include a sequence complementary to a nucleic acid epitype comprising X CpG sites with a particular methylation status. In various embodiments, nucleic acid epitype probes further include a binding moiety that binds to a solid support. In various embodiments, a binding moiety refers to a biotin moiety that can bind to a solid support (e.g., a solid bead) via a corresponding streptavidin moiety on the solid support. In various embodiments, a nucleic acid epitype probe comprises a detection moiety. In various embodiments, a detection moiety comprises a tag, such as a fluorescent tag. In various embodiments, a nucleic acid epitype probe comprises a barcode. Inclusion of a barcode sequence on nucleic acid epitype probes can enable subsequent demultiplexing. In various embodiments, each nucleic acid epitype probe includes a unique barcode that differs from other barcodes of other nucleic acid epitype probes. Use of unique barcodes enables demultiplexing of different probes. In various embodiments, nucleic acid epitype probes provided to nucleic acid templates from a common sample all have a common barcode, for example, which is different from the barcodes of probes provided to nucleic acid templates in other samples. This enables subsequent demultiplexing of nucleic acids from different samples. [0070] In various embodiments, providing nucleic acid epitype probes involves contacting a nucleic acid template derived from converted cell-free DNA obtained from a biological sample of a subject with a nucleic acid epitype probe. In various embodiments, the nucleic acid template contacts a nucleic acid epitype probe in the presence of a hybridization solution. As used herein, a hybridization solution selectively raises the stability of A:T base pairs to substantially the same stability of G:C base pairs. Given that the nucleic acid template is derived from converted nucleic acids, there are likely higher concentrations of A:T base pairs (due to C deaminating to U). Therefore, use of the hybridization solution to improve the stability of A:T base pairs can, in some circumstances, assist in improving the accuracy of detection of nucleic acid epitype probes. [0071] In particular embodiments, the hybridization solution comprises a quaternary ammonium salt, such as tetramethylammonium chloride (TMAC). In various embodiments, the hybridization solution comprises tetramethylammonium chloride (TMAC) at a concentration between 10 mM and 6 M. In various embodiments, the hybridization solution comprises tetramethylammonium chloride (TMAC) at a concentration between 10 mM and 5 M, between 10 mM and 4 M, between 10 mM and 3 M, between 10 mM and 2 M, between 10 mM and 1 M, between 1 M and 6 M, between 2 M and 6 M, between 2 M and 5 M, between 2 M and 4 M, between 100 mM and 5 M, between 150 mM and 4 M, between 200 mM and 3 M, between 300 mM and 2 M, between 400 mM and 1 M, between 500 mM and 900 mM, between 600 mM and 800 mM, between 20 mM and 100 mM, between 30 mM and 90 mM, between 40 mM and 80 mM, between 50 mM and 70 mM, or between 55 mM and 65 mM. In various embodiments, the hybridization solution comprises tetramethylammonium chloride (TMAC) at a concentration of about 10 mM, about 15 mM, about 20 mM, about 25 mM, about 30 mM, about 35 mM, about 40 mM, about 45 mM, about 50 mM, about 55 mM, about 60 mM, about 65 mM, about 70 mM, about 75 mM, about 80 mM, about 85 mM, about 90 mM, about 95 mM, about 100 mM, about 150 mM, about 200 mM, about 250 mM, about 300 mM, about 350 mM, about 400 mM, about 450 mM, about 500 mM, about 600 mM, about 700 mM, about 800 mM, about 900 mM, about 1 M, about 1.5 M, about 2 M, about 2.5 M, about 3 M, about 3.5 M, about 4 M, about 4.5 M, about 5M about 5.5 M, or about 6 M. [0072] In various embodiments, methods disclosed herein involve providing a nucleic acid epitype probe designed to be complementary to a converted nucleic acid epitype, wherein the converted nucleic acid epitype comprises one or more CpG sites that, prior to conversion, were non-methylated, partially methylated, or fully methylated; and contacting a nucleic acid template derived from converted cell-free DNA obtained from a biological sample of a subject with the nucleic acid epitype probe, wherein the epitype probe hybridizes to the nucleic acid template if the epitype probe is complementary to the nucleic acid template. In various embodiments, methods disclosed herein further involve providing one or more additional nucleic acid epitype probes, wherein one of the additional nucleic acid epitype probe comprises a sequence that differs from the sequence of the nucleic acid epitype probe by one nucleotide. In various embodiments, an additional nucleic acid epitype probe differs from the nucleic acid epitype probe by a single nucleotide, such as a G Æ A substitution. Due to the single nucleotide difference, the additional nucleic acid epitype probe does not hybridize with the nucleic acid template. In various embodiments, the one or more additional nucleic acid epitype probes comprise (2 ^ െ 1) additional nucleic acid epitype probes, wherein X represents a total number of CpG sites in a sequence of the cell-free DNA. In various embodiments, each of the (2 ^ െ 1) additional nucleic acid epitype probes comprises one or more of a biotin moiety, a fluorescent tag, or a barcode. In various embodiments, providing the nucleic acid epitype probe and providing one or more additional nucleic acid epitype probes occurs simultaneously. For example, the nucleic acid epitype probe and the one or more additional nucleic acid epitype probes can be substantially mixed together and then provided together e.g., to a nucleic acid template derived from converted cell-free DNA. [0073] Reference is now made to FIG.3A, which depicts an example provision of nucleic acid epitype probes, in accordance with an embodiment. FIG.3A depicts a nucleic acid template 305 derived from converted nucleic acids. In various embodiments, the nucleic acid template 305 previously underwent library construction. The nucleic acid template 305 may include one or more adapters, a biotin moiety, a barcode, or any combination thereof. [0074] Nucleic acid epitype probes 310 are provided to contact the nucleic acid template 305. FIG. 3A shows individual nucleic acid epitype probes (e.g., 310A, 310B, 310C, etc.). In total, there may be 2 ^ total nucleic acid epitype probes where X refers to the total number of sites in the nucleic acid template 305 that correspond to CpG sites of the nucleic acid epitype. In the example shown in FIG. 3A, there may be two total sites in the nucleic acid template 305 corresponding to CpG sites of the nucleic acid epitype. In other embodiments, there may be fewer or additional sites in the nucleic acid template 305 corresponding to CpG sites of the nucleic acid epitype. For example, example CGIs described herein in Tables 1-4 may have more than two CpG sites. In the example shown in FIG.3A, the total number of sites X in the nucleic acid template 305 corresponding to CpG sites of the nucleic acid epitype is 2, and therefore, a total of 4 nucleic acid epitype probes (e.g., 310A, 310B, 310C, 310D) are provided. [0075] Specifically, nucleic acid epitype probe 310A can be designed to hybridize with a complementary template sequence in which both site 302A and 302B correspond to methylated CpG sites. As methylated cytosines will remain unaffected by the conversion process and will remain cytosine nucleobases, then the nucleic acid epitype probe 310A will include a first guanine nucleobase at a position corresponding to site 302A and a second guanine nucleobase at a position corresponding to site 302B. Nucleic acid epitype probe 310B can be designed to hybridize with a complementary template sequence in which site 302A corresponds to a methylated CpG site and site 302B corresponds to an unmethylated CpG site. Thus, the nucleic acid epitype probe 310B will include a guanine nucleobase at a position corresponding to site 302A and an adenine nucleobase at a position corresponding to site 302B. Nucleic acid epitype probe 310C can be designed to hybridize with a complementary template sequence in which site 302A corresponds to an unmethylated CpG site and site 302B corresponds to a methylated CpG site. Thus, the nucleic acid epitype probe 310C will include an adenine nucleobase at a position corresponding to site 302A and a guanine nucleobase at a position corresponding to site 302B. Nucleic acid epitype probe 310D can be designed to hybridize with a complementary template sequence in which both sites 302A and 302B correspond to unmethylated CpG sites. Thus, the nucleic acid epitype probe 310D will include a first adenine nucleobase at a position corresponding to site 302A and a second adenine nucleobase at a position corresponding to site 302B. [0076] As further shown in FIG. 3A, the nucleic acid epitype probes 310 are provided to contact the nucleic acid template 305 in the presence of a hybridization solution 320. In particular embodiments, the hybridization solution 320 comprises tetramethylammonium chloride (TMAC). [0077] FIG.3B depicts example hybridization of a nucleic acid epitype probe 310A to a nucleic acid template, in accordance with an embodiment. In this example, nucleic acid epitype probe 310A is fully complementary to a sequence of the nucleic acid template 305. Given that nucleic acid epitype probe 310A was designed to hybridize with a complementary template sequence in which both site 302A and 302B correspond to methylated CpG sites, this indicates that the nucleic acid epitype is fully methylated (e.g., both CpG sites are methylated). Here, although the sequences of the other nucleic acid epitype probes 310B, 310C, and 310D may only differ from the sequence of the nucleic acid epitype probe 310A by a limited number of nucleotides (e.g., 1 or 2 nucleotides at most), nucleic acid epitype probe 310A is able to successfully hybridize with the sequence of the nucleic acid template 305. [0078] Reference is now made to FIGs. 4A, 4B, and 4C, each of which depicts example nucleic acid epitype probes, in accordance with different embodiment. Although FIGs.4A, 4B, and 4C is described in reference to a single nucleic acid epitype probe (e.g., 310A), the description is equally relevant to additional nucleic acid epitype probes (e.g., 310B, 310C, 310D as shown in FIGs. 3A and 3B). [0079] In the embodiment shown in FIG. 4A, the nucleic acid epitype probe 310A may include a sequence 415A that is designed to hybridize with a complementary template sequence. For example, as described above in reference to FIG. 3B, the nucleic acid epitype probe 310A includes a sequence 415A with a first guanine nucleobase at a position corresponding to site 302A and a second guanine nucleobase at a position corresponding to site 302B of the nucleic acid template 305. As shown in FIG.4A, the nucleic acid epitype probe 310A may further include a barcode sequence 410A. Inclusion of a barcode sequence on nucleic acid epitype probes can enable subsequent demultiplexing. In various embodiments, the length of the barcode sequence is between 3 and 20 nucleotides. In various embodiments, the length of the barcode sequence is between 4 and 17 nucleotides, between 5 and 14 nucleotides, between 6 and 11 nucleotides, or between 7 and 8 nucleotides, inclusive. In various embodiments, the length of the barcode sequence is 8 nucleotides. [0080] FIG.4B shows a second embodiment of the nucleic acid epitype probe 310A including a sequence 415A and a detection moiety 420A. In various embodiments, the detection moiety 420A is a fluorescent tag that enables detection of the nucleic acid epitype probe 310A. For example, if performing PCR (e.g., real-time PCR), accumulation of amplicons comprising a sequence of the nucleic acid epitype probe 310A or hybridized to a sequence of the nucleic acid epitype probe 310A will result in detection of signal deriving from fluorescent tag 420A. In various embodiments, the detection moiety 420A may uniquely distinguish the nucleic acid epitype probe 310A from other nucleic acid epitype probes (e.g., the other nucleic acid epitype probes may have other distinguishable detection moieties). [0081] FIG.4C shows a third embodiment of the nucleic acid epitype probe 310A including a sequence 415A and a binding moiety 425A. Here, the binding moiety 425A can enable the nucleic acid epitype probe 310A to couple or bind to a solid support. As described in further detail herein, the binding of the nucleic acid epitype probe 310A to a corresponding solid support can be useful for isolating and enriching the nucleic acid epitype probe 310A. In various embodiments, the binding moiety 425A comprises a biotin moiety. Thus, the biotin moiety can bind to a corresponding streptavidin moiety, e.g., on the solid support. [0082] Although FIGs.4A-4C show three different embodiments in which the nucleic acid epitype probe 310A includes one of a barcode 410A, detection moiety 420A, and binding moiety 425A, in various embodiments, the nucleic acid epitype probe 310A can include combinations of the barcode 410A, detection moiety 420A, and binding moiety 425A. For example, the nucleic acid epitype probe 310A can include a barcode 410A and a detection moiety 420A, but need not include a binding moiety 425A. As another example, the nucleic acid epitype probe 310A can include a barcode 410A and binding moiety 425A, but need not include a detection moiety 420A. As yet another example, the nucleic acid epitype probe 310A can include a detection moiety 420A and binding moiety 425A, but need not include a barcode 410A. In various embodiments, the nucleic acid epitype probe 310A includes each of a barcode 410A, detection moiety 420A, and binding moiety 425A. Example processing and detecting of nucleic acid epitype probe hybridized to nucleic acid template [0083] As discussed herein, step 130 in FIG.1 involves processing a nucleic acid template hybridized to a nucleic acid epitype probe. Reference will be made to FIGs.5A-5C which depict a first embodiment of processing a nucleic acid template hybridized to a nucleic acid epitype probe. Reference will additionally be made to FIG.6, which depicts a second embodiment of processing a nucleic acid template hybridized to a nucleic acid epitype probe. [0084] In various embodiments, processing a nucleic acid template hybridized to a nucleic acid epitype probe involves one or more of isolating the nucleic acid template hybridized to the nucleic acid epitype probe, enriching for the nucleic acid template hybridized to the nucleic acid epitype probe, and dissociating the nucleic acid epitype probe from the nucleic acid template. In various embodiments, processing a nucleic acid template hybridized to a nucleic acid epitype probe involves each of isolating the nucleic acid template hybridized to the nucleic acid epitype probe, enriching for the nucleic acid template hybridized to the nucleic acid epitype probe, and dissociating the nucleic acid epitype probe from the nucleic acid template. [0085] In various embodiments, isolating the nucleic acid template hybridized to the nucleic acid epitype probe comprises exposing a binding moiety to the solid support. Examples of solid supports include solid beads, a slide (e.g., a glass slide), or a plate (e.g., plate comprising wells). In particular embodiments, the solid support is a solid bead (e.g., a polystyrene solid bead). In various embodiments, the binding moiety may be a moiety located on the nucleic acid template, and therefore, the nucleic acid template is bound to the solid support via the binding moiety. As another example, the binding moiety may be a moiety located on the nucleic acid epitype probe, and therefore, the nucleic acid epitype probe is bound to the solid support via the binding moiety. In various embodiments, the binding moiety is a biotin moiety. Thus, the biotin moiety can bind to a corresponding streptavidin moiety located on the solid support. [0086] In various embodiments, isolating the nucleic acid nucleic acid template hybridized to the nucleic acid epitype probe comprises separating the nucleic acid template hybridized to the nucleic acid epitype probe bound to the solid support from non-specifically associated nucleic acids. In various embodiments, the separation can involve manually separating or removing the solid support bound to the nucleic acid template or nucleic acid epitype probe. In various embodiments, isolating the nucleic acid template hybridized to the nucleic acid epitype probe comprises performing a centrifugation or filtration. [0087] In various embodiments, enriching for the nucleic acid template hybridized to the nucleic acid epitype probe comprises performing one or more washes to remove non-specifically associated nucleic acids. For example, the nucleic acid template hybridized to the nucleic acid epitype probe bound to the solid support can undergo one or more washes (e.g., buffer wash) to remove other unbound nucleic acids (e.g., other nucleic acid epitype probes). In various embodiments, enriching for the nucleic acid template hybridized to the nucleic acid epitype probe comprises performing a centrifugation or filtration to remove other unbound nucleic acids (e.g., other nucleic acid epitype probes). [0088] FIG.5A depicts enrichment of the nucleic acid epitype probe hybridized to the nucleic acid template, in accordance with an embodiment. FIG.5A is an exemplary illustration of a pull-down process for isolating and enriching the nucleic acid template 305 hybridized to a nucleic acid epitype probe 310A. FIG.5A further introduces a solid support 502 and a binding moiety 504. Here, the binding moiety 504 may be a biotin moiety linked to the nucleic acid template 305. Thus, the binding moiety 504 may bind to the solid support 502 via a streptavidin moiety. At this stage, the composition including the solid support 502, binding moiety 504, nucleic acid template 305, and nucleic acid epitype probe 310A can undergo enrichment via one or more washes, centrifugation, or filtration. This removes other additional nucleic acid epitype probes (e.g., 310B, 310C, and 310D) that are not bound to the solid support 502. [0089] Following isolation and enrichment, FIG.5B depicts an example dissociation of the nucleic acid epitype probe from the nucleic acid template, in accordance with an embodiment. In various embodiments, dissociating the nucleic acid epitype probe from the nucleic acid template comprises exposing the nucleic acid epitype probe and nucleic acid template to an elevated temperature. In various embodiments, the elevated temperature is above 40 o C, above 41 o C, above 42 o C, above 43 o C, above 44 o C, above 45 o C, above 46 o C, above 47 o C, above 48 o C, above 49 o C, above 50 o C, above 51 o C, above 52 o C, above 53 o C, above 54 o C, above 55 o C, above 56 o C, above 57 o C, above 58 o C, above 59 o C, above 60 o C, above 61 o C, above 62 o C, above 63 o C, above 64 o C, above 65 o C, above 66 o C, above 67 o C, above 68 o C, above 69 o C, above 70 o C, above 71 o C, above 72 o C, above 73 o C, above 74 o C, above 75 o C, above 76 o C, above 77 o C, above 78 o C, above 79 o C, above 80 o C, above 81 o C, above 82 o C, above 83 o C, above 84 o C, above 85 o C, above 86 o C, above 87 o C, above 88 o C, above 89 o C, above 90 o C, above 91 o C, above 92 o C, above 93 o C, above 94 o C, above 95 o C, above 96 o C, above 97 o C, above 98 o C, above 99 o C, or above 100 o C. In various embodiments, the elevated temperature is between 40 o C and 100 o C. In various embodiments, the elevated temperature is between 45 o C and 95 o C, between 50 o C and 90 o C, between 55 o C and 90 o C, between 60 o C and 85 o C, between 65 o C and 80 o C, between 70 o C and 75 o C, between 45 o C and 75 o C, between 50 o C and 70 o C, between 55 o C and 65 o C, or between 58 o C and 62 o C. [0090] In various embodiments, dissociating the nucleic acid epitype probe from the nucleic acid template comprises exposing the nucleic acid epitype probe and nucleic acid template to an elevated pH. In various embodiments, the elevated pH is above 7.0, 7.1, 7.2, 7.3, 7.4, 7.5, 7.6, 7.7, 7.8, 7.9, 8.0, 8.1, 8.2, 8.3, 8.4, 8.5, 8.6, 8.7, 8.8, 8.9, 9.0, 9.1, 9.2, 9.3, 9.4, 9.5, 9.6, 9.7, 9.8, 9.9, 10.0, 10.1, 10.2, 10.3, 10.4, 10.5, 10.6, 10.7, 10.8, 10.9, 11.0, 11.1, 11.2, 11.3, 11.4, 11.5, 11.6, 11.7, 11.8, 11.9, 12.0, 12.1, 12.2, 12.3, 12.4, 12.5, 12.6, 12.7, 12.8, 12.9, 13.0, 13.1, 13.2, 13.3, 13.4, 13.5, 13.6, 13.7, 13.8, or 13.9. In various embodiments, the elevated pH is between 7.0 and 13.0, between 7.5 and 12.5, between 8.0 and 12.0, between 8.5 and 11.5, between 9.0 and 11.0, between 9.5 and 10.5, between 9.8 and 10.2, between 7.0 and 10.0, between 7.5 and 9.5, between 8.0 and 9.0, between 10.0 and 13.0, between 10.5 and 12.5, between 11.0 and 12.0, or between 11.3 and 11.7. [0091] In various embodiments, dissociating the nucleic acid epitype probe from the nucleic acid template comprises exposing the nucleic acid epitype probe and nucleic acid template to a combination of an elevated temperature and elevated pH. In various embodiments, the combined elevated temperature and elevated pH is at least 50 o C and at least pH = 8.0. In various embodiments, the combined elevated temperature and elevated pH is at least 60 o C and at least pH = 9.0. In various embodiments, the combined elevated temperature and elevated pH is at least 60 o C and at least pH = 10.0. [0092] After the nucleic acid epitype probe is dissociated, FIG.5C depicts subsequent processing of the nucleic acid epitype probe 310A, including amplification and sequencing of the nucleic acid epitype probe, in accordance with an embodiment. The amplification 510 step includes providing amplification primers and reagents to amplify the nucleic acid epitype probe 310A. In various embodiments, amplification primers and reagents can be selectively provided to amplify the nucleic acid epitype probe 310A. For example, in various embodiments, the nucleic acid epitype probe 310A may include a detection moiety (e.g., such as detection moiety 420A described in FIG.4B). The detection moiety may uniquely distinguish the nucleic acid epitype probe 310A from other nucleic acid epitype probes. Thus, by detecting the detection moiety, the identity of the nucleic acid epitype probe 310A can be identified, and appropriate amplification primers (e.g., primers specific for sequences of the nucleic acid epitype probe 310A) can be provided for amplification. [0093] In various embodiments, nucleic acid epitype probe 310A shown in FIG.5C can be pooled with other nucleic acid epitype probes. In various embodiments, the other nucleic acid epitype probes may have been dissociated from other nucleic acid templates that underwent the same processing as nucleic acid template 305 shown in FIGs.3A and 3B. For example, each of the other nucleic acid templates may have been exposed to 2 different nucleic acid epitype probes that were designed to interrogate the full range of possible CpG methylation statuses of the nucleic acid epitype of the other nucleic acid template. Thus, each of the other nucleic acid epitype probes that are pooled with nucleic acid epitype probe 310A may have previously hybridized with another nucleic acid template. By pooling the nucleic acid epitype probes, this enables bulk amplification 510 and bulk sequencing 520 of large numbers of nucleic acid epitype probes that were, at one point, hybridized with a corresponding nucleic acid template. Thus, high throughput screening of various samples can be performed simultaneously through bulk amplification 510 and sequencing 520. [0094] After amplification 510, the amplicons are sequenced. Specifically, sequencing 520 involves sequencing the nucleic acid epitype probe (e.g., nucleic acid epitype probe 310A) to determine the identity of the nucleic acid epitype. For example, returning to the prior example, nucleic acid epitype probe 310A may include a first guanine nucleobase at a first position corresponding to a first CpG site of the nucleic acid epitype, and a second guanine nucleobase at a second position corresponding to a second CpG site nucleic acid epitype. Thus, by sequencing the nucleic acid epitype probe 310A, the nucleic acid epitype can be determined to have a cytosine at a first position corresponding to the first CpG site and a cytosine at a second position corresponding to the second CpG site. These two cytosines were likely methylated in the original cfDNA, because they underwent conversion (e.g., bisulfite conversion) and remained unaffected. Thus, by sequencing the nucleic acid epitype probe 310A, the nucleic acid epitype can be determined to have included a first methylated cytosine at a first CpG site and a second methylated cytosine at a second CpG site. Here, the nucleic acid epitype may be deemed fully methylated (e.g., since all CpG sites were methylated) as opposed to being partially methylated or non-methylated. Further details of sequencing, such as performance of next generation sequencing, are described herein. [0095] In various embodiments, after sequencing 520 nucleic acid epitypes in bulk, the method may involve demultiplexing sequencing data from the nucleic acid epitype probe and other nucleic acid epitype probes. In various embodiments, demultiplexing the sequencing data can be performed using differing barcodes (e.g., barcode 410A described in FIG. 4A) of the nucleic acid epitype probe and barcodes of the additional nucleic acid epitype probes. [0096] Reference is now made to FIG.6, which shows an example process for amplifying and detecting a nucleic acid epitype, in accordance with another embodiment. FIG. 6 introduces the nucleic acid template 305 hybridized to a nucleic acid epitype probe 310A, as was shown following FIG. 3B. FIG. 6 further shows an embodiment in which the nucleic acid epitype probe 310A includes a detection moiety 420A. In such embodiments, processing a nucleic acid template hybridized to a nucleic acid epitype probe involves amplifying the nucleic acid template. Here, the nucleic acid epitype probe 310A hybridized to the nucleic acid template 305 serves as a primer, such as an amplification primer, for amplifying the nucleic acid template 305. In various embodiments, amplification of the nucleic acid template involves performing polymerase chain reaction (PCR). Example PCR assays include, but are not limited to real-time PCR assays, quantitative real-time PCR (qPCR) assays, digital PCR (dPCR), allele-specific PCR assays, reverse-transcription PCR assays and reporter assays. [0097] As shown in FIG.6, Z cycles of nucleic acid amplification can be performed. In various embodiments, Z is between 20 and 80 cycles. In various embodiments, Z is between 25 and 70 cycles or between 30 and 60 cycles. In various embodiments, Z is between 30 and 50 cycles. In various embodiments, Z cycles of nucleic acid amplification is calculated according to when a signal from the detection moiety 420A is detected. For example, as shown in FIG. 6, at step 610, Z can refer to the number of amplification cycles until detection of a signal from the detection moiety 420A. The number of amplification cycles until detection of the signal is hereafter referred to as the cycle threshold (Ct) value. Here, detection of the signal from the detection moiety 420A can be indicative of presence of an amplification product, such as presence of an amplicon derived from the nucleic acid template. [0098] Step 615 involves detecting the nucleic acid epitype. In various embodiments, detecting the nucleic acid epitype involves correlating the detected signal in step 610 to a sequence of a nucleic acid epitype probe and/or a sequence of a nucleic acid template. For example, according to the embodiment shown in FIG.6, the signal may be derived from the detection moiety 420A that is associated with the nucleic acid epitype probe 310A. Generally, signals from different detection moieties may be sufficiently unique to distinguish each detection moiety. Thus, detecting the signal derived from detection moiety 420A indicates the presence of amplicons comprising a sequence of the nucleic acid epitype probe 310A. [0099] In various embodiments, step 615 involves determining a methylation status of the nucleic acid epitype. The methylation status of the nucleic acid epitype is one of non- methylated, partially methylated, or fully methylated. As an example, nucleic acid epitype probe 310A associated with detection moiety 420A may include a first guanine nucleobase at a first position corresponding to a first CpG site of the nucleic acid epitype, and a second guanine nucleobase at a second position corresponding to a second CpG site nucleic acid epitype. Thus, detecting a signal from the detection moiety 420A indicates the presence of amplicons comprising a sequence of nucleic acid epitype 310A, and the nucleic acid epitype can be determined to have a cytosine at a first position corresponding to the first CpG site and a cytosine at a second position corresponding to the second CpG site. These two cytosines were likely methylated in the original cfDNA, because they underwent conversion (e.g., bisulfite conversion) and remained unaffected. Thus, by detecting a signal from a detection moiety associated with nucleic acid epitype probe 310A, the nucleic acid epitype can be determined to have included a first methylated cytosine at a first CpG site and a second methylated cytosine at a second CpG site. Here, the nucleic acid epitype may be deemed fully methylated (e.g., since all CpG sites were methylated) as opposed to being partially methylated or non-methylated. [00100] Step 620 involves comparing the Z number of amplification cycles (Ct value) to a corresponding Ct value for a control sample. In various embodiments, the control sample is a negative control sample (e.g., a sample obtained from a subject known to not have a health condition). In various embodiments, the control sample is a positive control sample (e.g., a sample obtained from a subject known to have a health condition). In various embodiments, step 620 involves comparing the Z number of amplification cycles (Ct value) to a corresponding Ct value for a negative control sample and further comparing to a corresponding Ct value for a positive control sample. Thus, the difference in Ct values (e.g., delta-Ct value) between negative control and the target sample, as well as between the positive control and the sample, can be informative for determining presence of absence of the health condition in the target sample. Health Conditions [00101] The disclosure provides methods for detecting a nucleic acid epitype, which can be useful for screening one or more subjects for a presence or absence of a health condition. In various embodiments, after detecting a nucleic acid epitype, a more complex diagnostic tool can be implemented to confirm the detected nucleic acid epitype. In various embodiments, the patient may be suspected of having a health condition, but may not have been previously diagnosed with a health disorder. In various embodiments, the patient is healthy and is not yet suspected of having a health condition. [00102] In various embodiments, the health condition can be a disease or disorder. Examples of diseases and/or disorders can include, for example, a cancer, inflammatory disease, neurodegenerative disease, autoimmune disorder, neuromuscular disease, metabolic disorder (e.g., diabetes), cardiac disease, or fibrotic disease (e.g., idiopathic pulmonary fibrosis). [00103] In particular embodiments, the health condition is a cancer. In various embodiments, the cancer is an early stage cancer. In various embodiments, the cancer is a preclinical phase cancer. In various embodiments, the cancer is a stage I cancer. In various embodiments, the cancer is a stage II cancer. Thus, the methods disclosed herein enable the screening and diagnosis of an individual for an early stage or preclinical stage cancer. [00104] In various embodiments, the cancer is any of an acute lymphoblastic leukemia, acute myeloid leukemia, adrenocortical carcinoma, soft tissue sarcoma, lymphoma, anal cancer, gastrointestinal cancer, brain cancer, skin cancer, bile duct cancer, bladder cancer, bone cancer, breast cancer, lung cancer, cardiac cancer, central nervous system cancer, cervical cancer, chronic lymphocytic leukemia, chronic myelogenous leukemia, chronic myeloproliferative neoplasms, colorectal cancer, uterine cancer, esophageal cancer, head and neck cancer, eye cancer, fallopian tube cancer, gallbladder cancer, gastric cancer, germ cell tumor, gestational trophoblastic cancer, hairy cell leukemia, liver cancer, Hodgkin lymphoma, intraocular melanoma, pancreatic cancer, kidney cancer, leukemia, mesothelioma, metastatic cancer, mouth cancer, multiple endocrine neoplasia syndromes, multiple myeloma neoplasms, myelodysplastic neoplasms, ovarian cancer, parathyroid cancer, penile cancer, pheochromocytoma, pituitary cancer, plasma cell neoplasm, primary peritoneal cancer, prostate cancer, rectal cancer, retinoblastoma, sarcoma, small intestine cancer, testicular cancer, throat cancer, thymoma and thymic carcinoma, thyroid cancer, urethral cancer, uterine cancer, vaginal cancer, and vulvar cancer. [00105] In various embodiments, the inflammatory disease can be any one of acute respiratory distress syndrome (ARDS), acute lung injury (ALI), alcoholic liver disease, allergic inflammation of the skin, lungs, and gastrointestinal tract, allergic rhinitis, ankylosing spondylitis, asthma (allergic and non-allergic), atopic dermatitis (also known as atopic eczema), atherosclerosis, celiac disease, chronic obstructive pulmonary disease (COPD), chronic respiratory distress syndrome (CRDS), colitis, dermatitis, diabetes, eczema, endocarditis, fatty liver disease, fibrosis (e.g., idiopathic pulmonary fibrosis, scleroderma, kidney fibrosis, and scarring), food allergies (e.g., allergies to peanuts, eggs, dairy, shellfish, tree nuts, etc.), gastritis, gout, hepatic steatosis, hepatitis, inflammation of body organs including joint inflammation including joints in the knees, limbs or hands, inflammatory bowel disease (IBD) (including Crohn's disease or ulcerative colitis), intestinal hyperplasia, irritable bowel syndrome, juvenile rheumatoid arthritis, liver disease, metabolic syndrome, multiple sclerosis, myasthenia gravis, neurogenic lung edema, nephritis (e.g., glomerular nephritis), non-alcoholic fatty liver disease (NAFLD) (including non-alcoholic steatosis and non-alcoholic steatohepatitis (NASH)), obesity, prostatitis, psoriasis, psoriatic arthritis, rheumatoid arthritis (RA), sarcoidosis sinusitis, splenitis, seasonal allergies, sepsis, systemic lupus erythematosus, uveitis, and UV-induced skin inflammation. [00106] In various embodiments, the neurodegenerative disease can be any one of Alzheimer's disease, Parkinson's disease, traumatic CNS injury, Down Syndrome (DS), glaucoma, amyotrophic lateral sclerosis (ALS), frontotemporal dementia (FTD), and Huntington’s disease. [00107] Exemplary metabolic disorders include, for example, diabetes, insulin resistance, lysosomal storage disorders (e.g., Gaucher’s disease, Krabbe disease, Niemann Pick disease types A and B, multiple sclerosis, Fabry’s disease, Tay Sachs disease, and Sandhoff Variant A, B), obesity, cardiovascular disease, and dyslipidemia. Sequencing and Read Alignment [00108] Disclosed herein are methods for sequencing nucleic acid epitype probes e.g., to determine the identity of a nucleic acid epitype. Sequencing can be performed using commercially available next generation sequencing (NGS) platforms, including platforms that perform any of sequencing by synthesis, sequencing by ligation, nanopore sequencing, pyrosequencing, using reversible terminator chemistry, using phospholinked fluorescent nucleotides, or real-time sequencing. As an example, amplicons (e.g., amplicons comprising a sequence of a nucleic acid epitype probe) may be sequenced on an Illumina MiSeq platform. [00109] Nanopore sequencing refers to real-time sequencing of nucleic acids by detecting changes in electrical current as nucleic acids pass through a protein nanopore. Here, nucleic acids need not undergo amplification (e.g., PCR amplification) or labeling. Depending on the various factors of the nucleotide base that causes the electrical change, such as geometry, size, and chemical composition, nanopore sequencing enables real-time readout of nucleotide bases that make up a nucleic acid. Additional details for nanopore sequencing are found in US Patent No.10,480,027, which is incorporated by reference in its entirety. [00110] On the Solexa / Illumina platform, sequencing data is produced in the form of short readings. In this method, fragments of a library of NGS fragments are captured on the surface of a flow cell that is coated with oligonucleotide anchor molecules. An anchor molecule is used as a PCR primer, but due to the length of the matrix and its proximity to other nearby anchor oligonucleotides, elongation by PCR leads to the formation of a “vault” of the molecule with its hybridization with the neighboring anchor oligonucleotide and the formation of a bridging structure on the surface of the flow cell. These DNA loops are denatured and cleaved. Straight chains are then sequenced using reversibly stained terminators. The nucleotides included in the sequence are determined by detecting fluorescence after inclusion, where each fluorescent and blocking agent is removed prior to the next dNTP addition cycle. Additional details for sequencing using the Illumina platform are found in Voelkerding et al., Clinical Chem., 55: 641- 658, 2009; MacLean et al., Nature Rev. Microbiol., 7: 287-296; US Patent No. 6,833,246; US Patent No.7,115,400; US Patent No.6,969,488; each of which is hereby incorporated by reference in its entirety. [00111] Sequencing of nucleic acid molecules using SOLiD technology includes clonal amplification of the library of NGS fragments using emulsion PCR. After that, the granules containing the matrix are immobilized on the derivatized surface of the glass flow cell and annealed with a primer complementary to the adapter oligonucleotide. However, instead of using the indicated primer for 3 'extension, it is used to obtain a 5' phosphate group for ligation for test probes containing two probe-specific bases followed by 6 degenerate bases and one of four fluorescent labels. In the SOLiD system, test probes have 16 possible combinations of two bases at the 3 'end of each probe and one of four fluorescent dyes at the 5' end. The color of the fluorescent dye and, thus, the identity of each probe, corresponds to a certain color space coding scheme. After many cycles of alignment of the probe, ligation of the probe and detection of a fluorescent signal, denaturation followed by a second sequencing cycle using a primer that is shifted by one base compared to the original primer. In this way, the sequence of the matrix can be reconstructed by calculation; matrix bases are checked twice, which leads to increased accuracy. Additional details for sequencing using SOLiD technology are found in Voelkerding et al., Clinical Chem., 55: 641-658, 2009; MacLean et al., Nature Rev. Microbiol., 7: 287-296; US Patent No.5,912,148; US Patent No.6,130,073; each of which is incorporated by reference in its entirety. [00112] In particular embodiments, HeliScope from Helicos BioSciences is used. Sequencing is achieved by the addition of polymerase and serial additions of fluorescently-labeled dNTP reagents. Switching on leads to the appearance of a fluorescent signal corresponding to dNTP, and the specified signal is captured by the CCD camera before each dNTP addition cycle. The reading length of the sequence varies from 25-50 nucleotides with a total yield exceeding 1 billion nucleotide pairs per analytical work cycle. Additional details for performing sequencing using HeliScope are found in Voelkerding et al., Clinical Chem., 55: 641-658, 2009; MacLean et al., Nature Rev. Microbiol., 7: 287-296; US Patent No.7,169,560; US Patent No.7,282,337; US Patent No.7,482,120; US Patent No.7,501,245; US Patent No.6,818,395; US Patent No. 6,911,345; US Patent No.7,501,245; each of which is incorporated by reference in its entirety. [00113] In some embodiments, a Roche sequencing system 454 is used. Sequencing 454 involves two steps. In the first step, DNA is cut into fragments of approximately 300-800 base pairs, and these fragments have blunt ends. Oligonucleotide adapters are then ligated to the ends of the fragments. The adapter serves as primers for amplification and sequencing of fragments. Fragments can be attached to DNA-capture beads, for example, streptavidin-coated beads, using, for example, an adapter that contains a 5'-biotin tag. Fragments attached to the granules are amplified by PCR within the droplets of an oil-water emulsion. The result is multiple copies of cloned amplified DNA fragments on each bead. At the second stage, the granules are captured in wells (several picoliters in volume). Pyrosequencing is carried out on each DNA fragment in parallel. Adding one or more nucleotides leads to the generation of a light signal, which is recorded on the CCD camera of the sequencing instrument. The signal intensity is proportional to the number of nucleotides included. Pyrosequencing uses pyrophosphate (PPi), which is released upon the addition of a nucleotide. PPi is converted to ATP using ATP sulfurylase in the presence of adenosine 5 'phosphosulfate. Luciferase uses ATP to convert luciferin to oxyluciferin, and as a result of this reaction, light is generated that is detected and analyzed. Additional details for performing sequencing 454 are found in Margulies et al. (2005) Nature 437: 376-380, which is hereby incorporated by reference in its entirety. [00114] Ion Torrent technology is a DNA sequencing method based on the detection of hydrogen ions that are released during DNA polymerization. The microwell contains a fragment of a library of NGS fragments to be sequenced. Under the microwell layer is the hypersensitive ion sensor ISFET. All layers are contained within a semiconductor CMOS chip, similar to the chip used in the electronics industry. When dNTP is incorporated into a growing complementary chain, a hydrogen ion is released that excites a hypersensitive ion sensor. If homopolymer repeats are present in the sequence of the template, multiple dNTP molecules will be included in one cycle. This results in a corresponding amount of hydrogen atoms being released and in proportion to a higher electrical signal. This technology is different from other sequencing technologies that do not use modified nucleotides or optical devices. Additional details for Ion Torrent Technology is found in Science 327 (5970): 1190 (2010); US Patent Application Publication Nos.20090026082, 20090127589, 20100301398, 20100197507, 20100188073, and 20100137143, each of which is incorporated by reference in its entirety. [00115] In various embodiments, sequencing reads obtained from the NGS methods can be filtered by quality and grouped by barcode sequence e.g., to enable demultiplexing of sequences from different samples. In some embodiments, a given sequencing read may be discarded if more than about 20% of its bases have a quality score (Q-score) less than Q20, indicating a base call accuracy of about 99%. In some embodiments, a given sequencing read may be discarded if more than about 5%, about 10%, about 15%, about 20%, about 25%, about 30% have a Q-score less than Q10, Q20, Q30, Q40, Q50, Q60, or more, indicating a base call accuracy of about 90%, about 99%, about 99.9%, about 99.99%, about 99.999%, about 99.9999%, or more, respectively. [00116] In some embodiments, sequencing reads associated with a barcode containing less than 50 reads may be discarded to ensure that all barcode groups, representing individual samples, contain a sufficient number of high-quality reads. In some embodiments, all sequencing reads associated with a barcode containing less than 30, less than 40, less than 50, less than 60, less than 70, less than 80, less than 90, less than 100 or more may be discarded to ensure the quality of the barcode groups representing individual samples. [00117] In various embodiments, sequence reads with common barcode sequences (e.g., meaning that sequence reads originated from the same sample) may be aligned to a reference genome using known methods in the art to determine alignment position information. For example, sequence reads can be aligned to a range of positions of a reference genome. The alignment position information may indicate a beginning position and an end position of a region in the reference genome that corresponds to a beginning nucleotide base and end nucleotide base of a given sequence read. In various embodiments, a region in the reference genome may be associated with a particular genomic region, such as a CGI shown in any of Tables 1-4. Example Kit Embodiments [00118] Also disclosed herein are kits for performing the methods disclosed herein (e.g., for detecting a nucleic acid epitype and/or for detecting circulating tumor DNA in a biological sample of a subject). Such kits can include reagents for performing the methods disclosed herein, such as reagents for converting nucleic acids (e.g., via bisulfite conversion) from obtained samples and/or reagents comprising nucleic acid epitype probes. In particular embodiments, a kit includes reagents comprising one or more nucleic acid epitype probes designed to be complementary to a converted nucleic acid epitype, wherein the converted nucleic acid epitype comprises one or more CpG sites that, prior to conversion, were non-methylated, partially methylated, or fully methylated. [00119] In various embodiments, a kit includes reagents comprising a plurality of nucleic acid epitype probes that are sufficient for interrogating a full range of possible CpG methylation statuses of a nucleic acid epitype. For example, a kit may include reagents comprising 2௫ nucleic acid epitype probes, where X refers to the total number of CpG sites of the nucleic acid epitype. [00120] In various embodiments, a kit can include instructions for use of a set of reagents. For example, a kit can include instructions for converting nucleic acids from an obtained sample e.g., by performing bisulfite conversion. In various embodiments, a kit can include instructions for providing a nucleic acid epitype probe designed to be complementary to a converted nucleic acid epitype, wherein the converted nucleic acid epitype comprises one or more CpG sites that, prior to conversion, were non-methylated, partially methylated, or fully methylated. In various embodiments, a kit can include instructions for contacting a nucleic acid template derived from converted cell-free DNA obtained from a biological sample of a subject with the nucleic acid epitype probe, wherein the epitype probe hybridizes to the nucleic acid template if the epitype probe is complementary to the nucleic acid template. In various embodiments, a kit can include instructions for detecting the nucleic acid epitype by detecting the nucleic acid epitype probe that hybridized to the nucleic acid template. [00121] In various embodiments, the instructions of the kit can be present in a variety of forms, one or more of which can be present in the kit. One form in which these instructions can be present is as printed information on a suitable medium or substrate, e.g., a piece or pieces of paper on which the information is printed, in the packaging of the kit, in a package insert, etc. Yet another means would be a computer readable medium, e.g., diskette, CD, hard-drive, network data storage, etc., on which the information has been recorded. Yet another means that can be present is a website address which can be used via the internet to access the information at a removed site. Any convenient means can be present in the kits. EXAMPLES [00122] Below are examples of specific embodiments for carrying out the present invention. The examples are offered for illustrative purposes only and are not intended to limit the scope of the present invention in any way. Efforts have been made to ensure accuracy with respect to numbers used (e.g., percentages, etc.), but some experimental error and deviation should be allowed for. Example 1: Example Library Preparation Prepare target specimen [00123] The target specimen type (e.g., DNA, RNA) is isolated from a patient’s biological source (e.g., tissue, blood, plasma, serum, saliva, feces, etc.). That specimen can be isolated by a contract research organization, private or service laboratory or hospital, or isolated using an internal procedure. All target specimens are assayed for quality and quantity measurements. Convert Unmethylated Cytosines to Uracils [00124] Bisulfite conversion is performed on DNA by denaturation using high heat, preferential deamination (at an acidic pH) of unmethylated cytosines, which are then converted to uracil by desulfonation (at an alkaline pH). Methylated cytosines remain unchanged on the single- VWUDQGHG^'1$^^VV'1$^^SURGXFW^ௗௗ Generate library [00125] The bisulfite converted ssDNA undergoes Adaptase® technology from Swift Biosciences, which is an enzymatic reaction resulting in unbiased addition of a truncated adapter. The Adaptase® enzymatic reaction performs end-repairing, tailing of 3’ ends and ligation of first truncated adapter complement to 3’ ends simultaneously. A uracil-free reverse complement to the bisulfite converted ssDNA is then generated using the truncated adapter to prime and extend. A solid-phase reversible immobilization (SPRI) selection is performed to remove unwanted ssDNA fragments, excess adapters and molecules. A ligation reaction is performed, adding truncated P5 adapter to the 3’ end of the uracil-free reverse complement fragment. A solid-phase reversible immobilization (SPRI) selection is performed to remove unwanted ssDNA fragments, excess adapters and molecules. Indexing PCR amplification is performed with a high fidelity DNA polymerase and unique, known 8-bp barcodes. Indices allow for sample multiplex for the downstream assay. The product is a bisulfite converted dsDNA library with full length adapters. Post-PCR, a SPRI selection is done to remove unwanted ssDNA fragments, excess primers, excess adapters and excess molecules. After library construction, the library quality and quantity are evaluated using the Agilent TapeStation and Qubit™ Fluorometer, respectively. Example 2: Example Epitype screening by Allele-specific Real-Time PCR [00126] Constructed libraries, as described in Example 1, undergo quality control checks. Libraries that pass all quality control checks move forward to epitype screening. Allele-specific real-time PCR is performed by combining library DNA with PCR reagents and primers specific for target epitype sequences 1 . The primers (e.g., nucleic acid epitype probes) are designed to have single-base discrimination between tumor and non-tumor sequences. Methods involve performing real-time PCR (or digital PCR) for 30-50 cycles and monitoring the output for signal via fluorescence from amplified target DNA or probe sequence. Cycle threshold values (Ct) are recorded and exported for analysis. The delta-Ct between negative control, positive control, and sample are calculated to determine presence or absence of target tumor sequences. Slight modifications of this protocol allows for end-point PCR detection of RNA or DNA of tumor sequences 2,3,4 . This screening tool is further confirmed by a more complex diagnostic tool. Example 3: Example Epitype screening by Hybridized Probe Sequencing [00127] FIG.7 shows an example process for detecting a nucleic acid epitype. FIG. 7 shows a first step of obtaining bisulfite converted nucleic acids (e.g., bisulfite converted cell free DNA). As described in Example 1, the bisulfite converted cfDNA undergoes library construction to generate a biotinylated library. Constructed libraries undergo quality control checks. Libraries that pass all quality control checks move forward to epitype screening. [00128] Nucleic acids of the library (e.g., nucleic acid templates) are pulled down via a streptavidin probe. Libraries are hybridized to a custom, epitype specific, barcoded, biotinylated probe. Nucleic acid epitype probes are provided in the presence of a hybridization solution including tetramethylammonium chloride (TMAC). Here, presence of TMAC drives complete hybridization 6,7 , which specifically increases the stability of A:T base pairs to be similar to G:C base pairs, resulting in a stabilized hybridization temperature regardless of probe sequence composition 8 . [00129] The library fragment hybridized to the biotinylated probe is pulled down by streptavidin beads, thereby enriching for the target regions of interest. The streptavidin bead-bound library is sequentially washed with buffers to remove non-specifically associated library fragments. Following washes and recovery of captured libraries, samples are enriched for on target fragments and depleted for off-target fragments. The bead-bound epitype target probe then undergoes dissociation from the hybridization to the library fragment DNA through high temperature and high pH conditions. Probes with non-overlapping barcodes are pooled to multiplex for shallow sequencing. Sequencing is completed on an iSeq using paired end 150x150 base sequencing with a 10% PhiX spike-in. Sequencing data generated is then demultiplexed utilizing the assigned barcode, aligned to the human genome and trimmed to enrich for epitype specific data only. This cleaned-up data is then processed through a quality pipeline to collapse duplicate reads and evaluate the sequencing data generated. A report is then generated with the specific epitype probe that was hybridized per library, showing positive enrichment for that specific cancer signal. This screening tool is further confirmed by a more complex diagnostic tool. References 1. Lang et al., 2011. J. Mol. Diag: 13 (1), 23-28. 2. Mitchell et al., 2008. PNAS:105 (30), 10513–10518. 3. Chubarov et al., 2020. Diagnostics: 10, 872-886. 4. Fox et al., 1998. British J. Cancer: 77(8),1267-1274. 5. Corey et al., 1997. Int. J. Cancer:71,1019–1028. 6. Shuber et al., 1997. Hum. Mol Genet: 6(3),337-347. 7. Öhrmlam et al., 2010. Nucleic Acids Research: (38)21,e195. 8. Shuber et al., 1993. Hum. Mol. Genet: 2(2),153-158. 9. Swift Biosciences. Accel-NGS® Methyl-Seq DNA Library Kit Protocol. Cat. No 30024/30096. www.swiftbiosci.com

TABLE^ϭ^^^List^of^CGIs Reference Pos^(hg19^coordinates) 1 chr13:108518334^108518633 2 chr6:137242315^137245442 3 chr2:177016416^177016632 4 chr5:2738953^2741237 5 chr4:111553079^111554210 6 chr15:96909815^96910030 7 chr6:42072032^42072701 8 chr10:123922850^123923542 9 chr16:86612188^86613821 10 chr19:47151768^47153125 11 chr1:110610265^110613303 12 chr5:3594467^3603054 13 chr9:126773246^126780953 14 chr3:138656627^138659107 15 chr4:4859632^4860191 16 chr10:118895963^118898037 17 chr7:103086344^103086840 18 chr19:407011^409511 19 chr10:22764708^22767050 20 chr16:86549069^86550512 21 chr9:96713326^96718186 22 chr8:139508795^139509774 23 chr2:73143055^73148260 24 chr8:26721642^26724566 25 chr9:129386112^129389231 26 chr12:49483601^49484255 27 chr16:54325040^54325703 28 chr8:72468560^72469561 29 chr18:70533965^70536871 30 chr9:98111364^98112362 31 chr1:50882997^50883426 32 chr10:88122924^88127364 33 chr11:31839363^31839813 34 chr10:101290025^101290338 35 chr6:41528266^41528900 36 chr16:51183699^51188763 37 chr5:140346105^140346931 38 chr9:23820691^23822135 39 chr20:690575^691099 40 chr1:177133392^177133846 41 chr5:45695394^45696510 42 chr2:45395869^45398186 43 chr20:48184193^48184833 44 chr6:6002471^6005125 45 chr14:101192851^101193499 chr8:4848968^4852635 chr8:53851701^53854426 chr12:186863^187610 chr5:54519054^54519628 chr6:108485671^108490539 chr3:157815581^157816095 chr11:626728^628037 chr2:177012371^177012675 chr17:59531723^59535254 chr16:55364823^55365483 chr8:99960497^99961438 chr7:42267546^42267823 chr17:14202632^14203258 chr10:102891010^102891794 chr5:174158680^174159729 chr14:33402094^33404079 chr2:177036254^177037213 chr10:106399567^106402812 chr6:166579973^166583423 chr11:123066517^123066986 chr11:44327240^44327932 chr14:95237622^95238211 chr9:102590742^102591303 chr15:76630029^76630970 chr4:24801109^24801902 chr8:97169731^97170432 chr3:6902823^6903516 chr22:48884884^48887043 chr15:45408573^45409528 chr9:100610696^100611517 chr4:174448333^174448845 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Table 3: Additional Example CGIs Table 4: Additional Example CGIs