MYOD可以抑制非E-box基因的基因表达.
Chiara Nicoletti1, Jimmy Massenet1, Andreas P Pintado-Urbanc2,3
1Development, Aging, and Regeneration Program, Sanford Burnham Prebys Medical Discovery Institute, La Jolla, California 92037, USA.
Genes & development
|August 6, 2025
概括
MYOD是一种基因调节剂,可以通过独立于E盒序列的结合染色质来抑制基因表达. 这种新发现的抑制功能对于体细胞转化为骨肌肉的转化至关重要.
科学领域:
- 分子生物学分子生物学
- 发展生物学 发展生物学
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
背景情况:
- 肌原因子D (MYOD) 是骨肌肉发育中的一个关键的转录因子.
- 传统的理解认为MYOD主要是通过E-box结合来激活肌肉特异性基因表达的激活剂.
- 在调节染色质可访问性和基因抑制方面,MYOD在调节染色质可访问性和基因抑制方面的作用仍然不太清楚.
研究的目的:
- 识别MYOD的新特性,超出其作为转录激活器的正规作用.
- 在体细胞转基因分化过程中研究MYOD介导的基因抑制机制.
- 探索E盒独立染色体结合在MYOD功能中的作用.
主要方法:
- 人体纤维细胞中MYOD的宫外表达和肌肉干细胞 (MuSCs) 中的内源诱导.
- 染色体可访问性测定和基因表达分析.
- 对MYOD突变体的分析,以剖析抑制的分子机制.
- 评估基因组修饰 (H3K27ac,H4 Kacme) 和CTCF介导的色素相互作用.
主要成果:
- 发现MYOD通过E盒独立的染色质结合抑制基因表达,降低了染色质在调节元素中的可访问性.
- 由MYOD介导的抑制与染色质紧缩和特定的基因素修饰模式 (减少的H4卡克米) 相关,与正规激活不同.
- 抑制机制各不相同:促进体对生长反应基因的结合和超增强体 (SE) 对谱系特定基因的退役,涉及不同的MYOD域和CTCF相互作用.
结论:
- MYOD具有以前未知的基因抑制器功能,独立于E-box序列运作.
- 通过替代色素招募 (依赖E盒或独立),影响基因表达和色素结构,MYOD表现出功能多功能性.
- 这些发现扩大了MYOD已知的生物特性,揭示了细胞重编程和肌肉发育中的复杂调节作用.
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