Usp7通过调节Histone H2B单双基因化调节质谱细胞特异转录因子
Dong-Ho Kim1, Sammy L Kim2, Vijai Singh3
1Graduate School of Biomedical Science and Engineering, Hanyang University, Seoul, Korea.
International journal of stem cells
|July 2, 2024
概括
在神经元分化过程中,泛基因特异性蛋白酶 Usp7 负面调节了组织素 H2B 单聚基因化 (H2Bub1). Usp7功能的丧失增强了H2Bub1并促进了小鼠细胞中的质生成.
科学领域:
- 表观遗传学和翻译后修改
- 干细胞生物学和分化
- 癌症生物学和表观遗传学
背景情况:
- 基因组H2B单双化 (H2Bub1) 是一个关键的表观遗传标记,参与DNA损伤反应和转录调节.
- 异常的H2Bub1与瘤发育有关,但在干细胞分化中的H2B二维基因化机制尚未完全理解.
- 脱化酶 (DUBs) 在调节H2Bub1方面发挥作用,影响细胞过程.
研究的目的:
- 调查DUBs在干细胞分化过程中调节H2Bub1中的作用.
- 为了识别涉及H2B二氧化脱氧化的特定DUB.
- 阐明确定DUBs在神经元和质谱系差异化中的功能.
主要方法:
- 选用于针对H2B单流化的DUB.
- 使用CRISPR/Cas9基因编辑来创建USP7功能丧失突变.
- 利用视网酸诱导小鼠胚胎癌细胞中的神经元分化.
- 分析H2Bub1水平的变化和差异化标记物的基因表达.
主要成果:
- Usp7被确定为一种特定于泛素的蛋白酶,可以负面调节H2B泛素化.
- 在视网膜酸诱导的分化过程中,USP7功能丧失导致H2Bub1水平增加.
- Usp7淘汰赛显著提高了神经元分化基因的调节,包括天体细胞和寡细胞标记物.
- 质谱转录因子 (Olig2,GFAP,Sox10) 的表达显著增加.
结论:
- 在神经元分化过程中,USP7作为H2B单基化的负调节剂.
- Usp7在促进小鼠胚胎癌细胞中的质生成中发挥了新且重要的作用.
- 准USP7可能为癌症和干细胞分化中的表观遗传失调提供新的治疗策略.
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