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由SMCHD1损失介导的DNMT3B拼接失调有助于DUX4过度表达和FSHD病原体
Eden Engal1,2,3, Aveksha Sharma2, Uria Aviel1,4
1The Lautenberg Center for Immunology and Cancer Research, The Institute for Medical Research Israel-Canada, Faculty of Medicine, The Hebrew University of Jerusalem, Jerusalem 9112102, Israel.
染色体的结构维护灵活的链域含有1 (SMCHD1) 损失扰乱了基因拼接,通过导致DUX4过度表达,导致面肌缩症 (FSHD). 这项研究揭示了SMCHD1.
科学领域:
- 表观遗传学和分子生物学
- 遗传学和基因组学 遗传学和基因组学
- 细胞和发育生物学
背景情况:
- 染色体结构维护灵活的链域含有1 (SMCHD1) 是一个表观遗传调节器.
- 在SMCHD1的突变与facioscapulohumeral肌肉发育不良 (FSHD) 的发病有关.
- 在基因调节,特别是替代拼接中SMCHD1的作用仍然不完全理解.
研究的目的:
- 研究SMCHD1在替代拼接中的作用.
- 阐明SMCHD1损失导致FSHD的分子机制.
- 为了确定关键的拼接因素和受SMCHD1功能障碍影响的途径.
主要方法:
- 对FSHD患者肌肉活检和Smchd1缺乏细胞的RNA测序分析.
- 拼接因子的高通量选.拼接因子的高通量选.
- RNA免疫沉降试验. 检测.
主要成果:
- SMCHD1损失导致数百个基因的广泛错误拼接,包括DNMT3B.
- DNMT3B错误拼接导致D4Z4区域的DNA低甲基化.
- SMCHD1对于将拼接因子RBM5招募到DNMT3B至关重要.
- DNMT3B的错误拼接导致DUX4过度表达,这是FSHD的标志.
结论:
- SMCHD1是替代拼接的关键调节器.
- 由于SMCHD1损失导致的DNMT3B错误拼接是FSHD病变的关键驱动因素.
- 针对SMCHD1介导的拼接缺陷为FSHD提供了一个潜在的治疗策略.
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