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ATRX可以防止中细胞前代细胞的异常分化

Yan Fang^1,2, Douglas Barrows³, Yakshi Dabas²

¹Department of Medicine, Memorial Sloan Kettering Cancer Center, New York, NY10065.

bioRxiv : the preprint server for biology

|August 23, 2023

概括

中细胞前代细胞中ATRX蛋白质的损失会引发异常分化成脂肪细胞. 这一发现揭示了ATRX变异如何促进肉瘤的发展.

科学领域:

表观遗传学在表观遗传学中,表观遗传学是指表观遗传学.
癌症生物学癌症生物学
细胞分化细胞分化

背景情况:

瘤抑制剂ATRX的变化在癌症,特别是瘤中很常见.
在表观遗传调节中,ATRX起着至关重要的作用,包括维护异染色素和转录调节.
了解ATRX的功能对于理解肉瘤的发病过程至关重要.

研究的目的:

为了研究ATRX在调节中酶体前代细胞分化中的功能.
阐明ATRX损失诱导差异化背后的表观遗传机制.
探讨这些发现对肉瘤病原学的影响.

主要方法:

利用小鼠介质原生细胞 (MPC) 来研究Atrx缺乏症.
分析了关键脂肪原转录因子 (Pparγ,Cebpα) 的基因表达.
评估了染色体可访问性,活性染色体标记和异染色体在特定基因谱系附近.
在可转移元素中检查的H3K9me3水平.

主要成果:

在MPCs中Atrx的缺乏导致中酶体差异化程序的异常激活,特别是脂肪生成.
失去ATRX诱导了脂肪生成因子的表达和增强的分化.
表观遗传变化包括失去了异染色质,增加了染色质的可访问性,并在调节元素上获得了活性标记.
在可转移元素中H3K9me3的耗尽导致它们的脱压,可能充当调节元素.

结论:

ATRX 作为一个关键的缓冲器,防止介质细胞前代细胞的分化.
失去ATRX功能,通过促进异常分化,有助于肉瘤的发展.
这些发现提供了关于ATRX相关癌症的表观遗传机制的见解.

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