通过LIBR-BRD4轴对不对称细胞分裂的表观遗传调节
Hsiao-Fan Chen1, Chia-Ting Chang2,3, Kai-Wen Hsu2
1Graduate Institute of Biomedical Sciences, China Medical University, Taichung 406, Taiwan.
Nucleic acids research
|November 21, 2023
概括
BRD4和LIBR lncRNA调节干细胞不对称的分裂. 抑制BRD4可能会通过促进对称细胞分裂而恶化癌症,从而影响治疗耐药性.
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.
- 干细胞生物学 干细胞生物学
- 分子生物学分子生物学
背景情况:
- 非对称的细胞分裂 (ACD) 对于干细胞的维持至关重要,但其表观遗传调节的理解很少.
- 像BRD4这样的BET域蛋白与乙化组织蛋白相互作用,可能在ACD中发挥作用.
- 了解这些表观遗传机制对于干细胞研究和癌症治疗至关重要.
研究的目的:
- 阐明干细胞中控制不对称细胞分裂 (ACD) 的表观遗传机制.
- 确定参与ACD的关键调节分子.
- 评估BRD4调节ACD对癌症治疗的影响.
主要方法:
- 研究了BRD4的作用及其与H3K56Ac在ACD中的相互作用.
- 在ACD的背景下分析了BRD4对ITGB1的调节.
- 描述了长非编码RNA LIBR (抑制BRD4的LncRNA) 在调节BRD4水平和ACD中的功能.
- 研究了通过RCK招募和多体结合抑制对BRD4LIBR介导的转化抑制的机制.
主要成果:
- 与H3K56Ac一起,BRD4被分离成子细胞并调节ACD.
- 通过控制ITGB1的表达,BRD4调节了ACD.
- lncRNA LIBR与BRD4 mRNA直接相互作用,抑制BRD4转化,并减少接受ACD的干细胞的比例.
- LIBR招募翻译抑制剂RCK,防止BRD4mRNA与多体结合.
结论:
- 确定BRD4和lncRNA LIBR作为不对称细胞分裂的关键表观遗传调节剂.
- 这些发现表明,BRD4在通过ACD维持干细胞种群方面发挥着重要作用.
- BRD4 抑制剂在癌症治疗中可能存在局限性,因为它们可以促进对称的细胞分裂,可能导致瘤的进展和治疗抵抗.
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