Histone lysine methylation has important functions in many biological processes that include gene expression,X-chromosome inactivation,gene imprinting and DNA repair.

• 组蛋白赖氨酸甲基化作为共价修饰的一种在基因表达调控、X染色体失活、基因组印迹、DNA修补等生物学过程中起重要作用。