通过G-四重复结合的Ewing瘤蛋白质对端粒重复含有RNA的转录调节
Luthfi Lulul Ulum1, Wakana Matsudaira2, Maiko Yamanashi2
1Graduate School of Science and Technology, Shizuoka University, Shizuoka, Shizuoka, 422-8529, Japan.
Scientific reports
|December 27, 2025
概括
尤文肉瘤蛋白 (EWS) 结合了端粒DNA和RNA的G四重复合体. EWS促进端粒重复含有RNA (TERRA) 转录,具有竞争性结合调节TERRA水平.
科学领域:
- 分子生物学分子生物学
- 遗传学 遗传学 是一个
- 癌症研究 癌症研究
背景情况:
- 端粒位于染色体末端,在癌症发育中至关重要.
- 端粒长度由端粒酶和替代延长途径维持.
- 端粒重复含有RNA (TERRA) 影响端粒延伸,并与端粒DNA形成G-四重复 (G4) 结构.
研究的目的:
- 研究G-四重复结构与TERRA转录调节之间的相关性.
- 阐明Ewing瘤 (EWS) 蛋白在端粒维护和TERRA转录中的作用.
主要方法:
- 在体外结合测试以评估EWS与G4DNA和TERRA的相互作用.
- 使用EWS突变体进行细胞研究,分析端粒结合和H3K27Ac丰富.
- 在不同的EWS表达条件下对TERRA转录水平的定量分析.
主要成果:
- EWS蛋白具有竞争性地与端粒DNA和TERRA G四重复结构结合.
- EWS与端粒的结合由其RGG域和N终端区域介导,影响H3K27Ac.
- EWS促进TERRA转录,而特定的突变会破坏这种功能.
- 突变的EWS变体显示了改变的G4结合亲和力,影响了TERRA转录水平.
结论:
- EWS蛋白在促进TERRA转录方面发挥着重要作用.
- TERRA和端粒DNA与EWS的竞争性结合对于维持TERRA转录水平至关重要.
- 研究结果表明,TERRA的新型监管机制涉及EWS和G-quadruplex结构.
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