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Ligation of a hairpin oligonucleotide to genomic DNA prior to bisulfite conversion and PCR amplification physically links the two complementary DNA strands. This additional step in the conversion procedure overcomes the limitations of conventional bisulfite sequencing where information of the cytosine methylation status is only obtained from one of the two strands of an individual DNA molecule. Sequences derived from hairpin bisulfite PCR products reveal the dynamics of this epigenetic memory system on both strands of individual DNA molecules. The chapter describes a reliable step-by-step procedure to generate hairpin-linked DNA. It also provides a guide for efficient bisulfite conversion that is suitable for both conventional and hairpin bisulfite sequencing approaches.


Reinhard Stöger. Hairpin-Bisulfite PCR. Methods in molecular biology (Clifton, N.J.). 2021;2198:287-299

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PMID: 32822039

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