Targeted sequencing technique for whole genome DNA methylation
First Claim
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1. A method for detection of nucleic acid methylation status, wherein said nucleic acid is double-stranded, said method comprises:
- (1) treating the nucleic acid double strands with a polymerase with 3′
→
5′
cleavage function or a 3′
→
5′
exonuclease, so that there is a deletion of 80 to 200 bases at the 3′
end of both strands;
(2) adding dNTP, wherein cytosine (C) is methylated cytosine (5mC), so that the deletion at the 3′
end of both strands is end-filled and cytosine thereof is methylated cytosine;
(3) treating the double strands in step (2), so that un-methylated cytosine is converted into uracil (U) while the methylated cytosine remains unchanged;
(4) PCR amplifying and sequencing the nucleic acid to determine the methylation status of the nucleic acid, wherein the un-methylated cytosine has been converted into thymine in a portion of a sequence for determining a methylation site;
the other portion of the sequence is the same as the original nucleic acid sequence because the cytosine has been methylated.
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Abstract
This invention is directed to a guide positioning sequencing technology of whole-genome DNA methylation. The invention provides a new detection method of nucleic acid methylation. In particular, a concept of “positioning” in the detection of nucleic acid methylation is provided. Specifically, a portion of a sequence is used for genome wide positioning and the other portion of the sequence is used for methylation detection in sequencing, thereby solving/defeating previously existing challenges in methylation detection and bioinformatics analysis of a genome.
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14 Claims
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1. A method for detection of nucleic acid methylation status, wherein said nucleic acid is double-stranded, said method comprises:
-
(1) treating the nucleic acid double strands with a polymerase with 3′
→
5′
cleavage function or a 3′
→
5′
exonuclease, so that there is a deletion of 80 to 200 bases at the 3′
end of both strands;(2) adding dNTP, wherein cytosine (C) is methylated cytosine (5mC), so that the deletion at the 3′
end of both strands is end-filled and cytosine thereof is methylated cytosine;(3) treating the double strands in step (2), so that un-methylated cytosine is converted into uracil (U) while the methylated cytosine remains unchanged; (4) PCR amplifying and sequencing the nucleic acid to determine the methylation status of the nucleic acid, wherein the un-methylated cytosine has been converted into thymine in a portion of a sequence for determining a methylation site;
the other portion of the sequence is the same as the original nucleic acid sequence because the cytosine has been methylated. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification