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解开MLL1-融合白血病:来自iPS细胞点突变的表观遗传启示

Laila Kobrossy¹, Weiyi Xu², Chunling Zhang³

¹Department of Biochemistry and Molecular Biology, SUNY Upstate Medical University, Syracuse, New York, United States.

The Journal of biological chemistry

|September 29, 2024

概括

混合血统白血病-1 (MLL1) 基因活性的丧失,而不是转位,通过改变基因素甲基化来驱动某些白血病. 准SETd1a为MLL1相关的白血病提供了一个新的治疗策略.

科学领域:

分子生物学分子生物学
表观遗传学在表观遗传学中,表观遗传学是指表观遗传学.
癌症研究癌症研究

背景情况:

急性白血病病理与涉及MLL1基因的11q23染色体转位有关.
MLL1-融合蛋白与白血病发生有关,但MLL1-融合白血病干细胞中H3K4三甲基化增加的机制尚不清楚.

研究的目的:

研究MLL1的酶活性在调节H3K4三甲基化和白血病干细胞表型中的作用.
在没有MLL1的催化SET域的情况下阐明H3K4三甲基化机制.

主要方法:

在人类诱导的多能干细胞中引入MLL1的同胞性功能丧失点突变.
分析了基因组甲基化模式,基因表达 (HoxA9-A13,Meis1,HOTTIP) 和上皮-介质细胞过渡标记 (ZEB1,SNAI2,HIC-5) 的分析.

主要成果:

在没有转位的情况下,MLL1突变模仿了MLL1融合白血病干细胞表型.
H3K4三甲基标记的全基因组再分配和白血病干细胞维护基因的上调.
增加了表皮-介质细胞过渡标记,细胞迁移和侵入性.

结论:

MLL1的酶活性对于抑制H3K4三甲基化和相关的表观遗传变化至关重要.
在没有MLL1活动的情况下,SETd1a可能催化H3K4三甲基化.
MLL1-融合白血病可能是MLL1对甲基转移酶活性的主导负效应的结果,这表明SETd1a是治疗点.

关键词:

在EMT中,EMT是EMT.甲基化H3K4的方法在MLL1中,MLL1是MLL1 这就是SETd1AA的意义.这是WDR5的WDR5.表观遗传性可塑性表观遗传性可塑性 iPS 细胞细胞 iPS 细胞在白血病干细胞中,精准医学是一门精准医学.

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