新型白血病衍生的突变TET2酶诱导基因组不稳定性通过基底转移从5-甲基酸到胺
Guang-Bo Jin1, Shao-Qin Rong1, Dong-Rui Yin1
1Shanghai Key Laboratory of Medical Epigenetics, Institutes of Biomedical Sciences, Chinese Academy of Medical Sciences (RU069) and Zhongshan-Xuhui Hospital, Medical College of Fudan University, Shanghai 200032, China.
概括
在白血病患者中,某些十-十一转位2 (TET2) 突变获得了新的功能,氧化胺而不是5-甲基细胞因. 这种新型活动有助于DNA损伤和白血病发生.
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.
- 分子生物学分子生物学
- 癌症研究 癌症研究
背景情况:
- 十-十一转位 (TET) 酶通过氧化DNA中的5-甲基细胞素 (mC) 来调节基因转录.
- 在血液癌症中,TET2的突变很常见,但它们的全部功能影响仍然不清楚.
研究的目的:
- 研究白血病患者中发现的TET2突变的功能后果.
- 探索这些突变是否会改变TET2的基质特异性,并导致新的活动.
主要方法:
- 对改变基质特异性的患者衍生TET2突变的分析.
- 使用重组TET2蛋白检测胺氧化物的生物化学测试.
- 细胞研究涉及HEK293T和小鼠胚胎干细胞中突变TET2的外源表达和内源敲入.
- 评估DNA损伤反应和突变积累在表达突变TET2.2细胞中的突变.
主要成果:
- 一个TET2突变的子集改变了基质的特异性,使胺能够氧化为5-基甲基 (hmU) 和5-甲基 (fU).
- 突变的TET2 (例如N1387T) 表达导致hmu积累,DNA损伤和DNA损伤反应基因的转录激活.
- 具有敲定突变TET2的细胞表现出更高的突变率和对ATR抑制的敏感性.
结论:
- 特定的患者衍生的TET2突变获得了新型的功能获取活动,氧化了thyine而不是mC.
- 这种新的活动有助于DNA损伤和基因组不稳定性,为TET2突变性白血病发生提供了新的见解.
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