MethylTarget™ assays were performed by Genesky BioTech (Shanghai, China) [12 (link), 23 (link)]. Briefly, we used an EZ DNA Methylation™-GOLD Kit (ZYMO RESEARCH) to transform all unmethylated cytosines to uracils. The samples with a bisulfite conversion rate < 98% were first filtered out. After the target CpG regions were amplified, separated, and purified by a gel extraction kit (Vazyme Biotech), a CpG island methylation assay was performed with an Illumina Hiseq/Miseq 2000 according to the manufacturer's protocol.
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