Epigenetics include two main forms: histone acetylation and DNA methylation, histone acetylation and DNA hypomethylation can promote gene expression,otherwise, they will inhibite gene expression.

• 表观遗传修饰主要包括组蛋白乙酰化和DNA甲基化,组蛋白乙酰化和DNA低甲基化可促进基因表达,反之,则可抑制基因表达。