超强增强器驱动的核心转录因子FOXP1通过相分离介导的SESN3激活延迟内皮细胞衰老
Lushuang Mao1,2, Zhao-Fu Liao1,2, Dong Tang1,2
1Guangdong Provincial Key Laboratory of Medical Immunology and Molecular Diagnostics, The First Dongguan Affiliated Hospital, Guangdong Medical University, Dongguan 523808, P.R. China.
在超强增强剂中,FOXP1蛋白经历液-液相分离 (LLPS),通过激活SESN3和抑制mTORC1信号,延迟内皮细胞衰老并抑制动脉样硬化.
科学领域:
- 表观遗传学和分子生物学
- 细胞衰老 细胞衰老
- 心血管疾病的研究研究.
背景情况:
- 内皮细胞衰老驱动内皮功能障碍和动脉样硬化进展.
- 超级增强剂是调节疾病中的基因转录的关键表观遗传元素.
- 连接超级增强剂与内皮细胞衰老的机制尚未完全理解.
研究的目的:
- 研究超强增强剂和液体液相分离 (LLPS) 在内皮细胞衰老中的作用.
- 为了确定参与调节内皮细胞衰老的核心转录因子.
- 阐明FOXP1影响内皮细胞衰老和动脉样硬化的分子机制.
主要方法:
- 超级增强剂,染色质可访问性和转录组 (CUT&Tag-seq, ATAC-seq, RNA-seq) 的全基因组分析.
- 使用Coltron算法进行生物信息分析,以确定核心转录因子.
- 实验验证FOXP1相分离特性 (FRAP,CRISPRi,Optodroplet测定) 和对内皮细胞衰老的功能影响.
主要成果:
- FOXP1被确定为一种超强增强器驱动的核心转录因子,延迟内皮细胞衰老并抑制动脉样硬化.
- 为了保持其延迟衰老的功能,FOXP1通过其内在无序区域的介导而经历LLPS.
- FOXP1激活SESN3并通过LLPS抑制mTORC1信号传递,这对于延迟内皮细胞衰老至关重要.
- 临床证据表明FOXP1和SESN3可能会防止动脉样硬化.
结论:
- 在超级增强剂中,FOXP1形成相分离的冷凝物,招募协活性剂.
- 这些凝结物增强SESN3促进体结合并抑制mTORC1信号传递,从而延迟内皮细胞衰老.
- 通过FOXP1介导的LLPS代表了调节内皮细胞衰老和动脉样硬化进展的新机制.
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