EZH2
组蛋白-離氨酸N-甲基转移酶EZH2是一个由人类EZH2基因所编码的酶[1][2]。已鉴定该基因转录出的两种转录物变异体编码不同的亚型[3]。
功能
该基因编码的蛋白属于多梳家族(PcG)成员。PcG家族成员相互结合形成多聚蛋白复合物,这种复合物涉及到在细胞世代间维持基因的转录抑制状态。EZH2主要通过将三个甲基基团加到组蛋白3的27号赖氨酸(H3K27)上行使基因沉默者的角色,三甲基化H3K27是维持染色质凝聚的一种重要修饰[4]。
该蛋白与胚胎外胚层发育蛋白(EED)、癌蛋白VAV1和X连锁核蛋白(XNP)之间关系密切。EZH2蛋白可能在造血系统和中枢神经系统中起到重要作用[3]。
临床意义
EZH2基因中的突变导致韦弗综合征[5]。miR-101在正常情况下阻止编码EZH2的mRNA进入翻译阶段。因此这一微RNA的基因一旦缺失就会导致产生过量的EZH2[6]。EZH2过多表达可能导致癌症形成,这是因为过多地组蛋白甲基化抑癌基因将导致其表达沉默。一种靶向EZH2药物的临床前模型显示其能够抑制脑癌及前列腺癌的进展[7][8]。
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