Nature:组蛋白H1缺失破坏染色质3D结构,驱动淋巴瘤发展 

2020-12-10 haibei MedSci原创

研究人员还确立了H1作为一种真正的肿瘤抑制因子,并表明H1的突变主要通过三维基因组重组驱动恶性转化,从而导致表观遗传学重编程和发育沉默基因的去抑制。

链接体组蛋白H1蛋白与核小体结合,帮助染色质紧密结构的形成。但是我们对其生物学功能还不甚了解。编码H1蛋白的亚型B-E(H1B,H1C,H1D和H1E;也分别称为H1-5,H1-2,H1-3和H1-4)的基因突变在B细胞淋巴瘤中高度复发,但这些突变与癌症的致病相关性以及所涉及的机制是未知的。

最近,研究人员在Nature杂志发文表明,淋巴瘤相关的H1等位基因是淋巴瘤的基因驱动突变。H1功能的破坏会导致基因组的深刻结构重塑,其特点是染色质从紧缩状态到松弛状态的大规模而又集中的转变。

这种解构推动了表观遗传状态的独特变化,主要是由于组蛋白H3在赖氨酸36处的二甲基化(H3K36me2)的获得和/或赖氨酸27处的抑制性H3三甲基化(H3K27me3)的丧失。这些变化解锁了干细胞基因的表达,这些基因通常在早期发育过程中被沉默。

在小鼠中,H1c和H1e(也分别称为H1f2和H1f4)的丢失赋予了生殖中心B细胞更强的适应性和自我更新的特性,最终导致了侵袭性淋巴瘤的再繁殖潜力增加。

总的来说,该研究的数据表明,H1蛋白通常需要将早期发育基因封存到结构上不可及的基因组隔室中。研究人员还确立了H1作为一种真正的肿瘤抑制因子,并表明H1的突变主要通过三维基因组重组驱动恶性转化,从而导致表观遗传学重编程和发育沉默基因的去抑制。

 

原始出处:

Nevin Yusufova et al. Histone H1 loss drives lymphoma by disrupting 3D chromatin architecture. Nature (2020). 

 

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    2021-10-19 liye789132251
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    2020-12-12 xqptu
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    2020-12-11 Jessie Zhang

    研究人员还确立了H1作为一种真正的肿瘤抑制因子,并表明H1的突变主要通过三维基因组重组驱动恶性转化,从而导致表观遗传学重编程和发育沉默基因的去抑制。

    0

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    2020-12-11 938641834

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