通过SS18::SSX进行BAF复合体独立基因激活:
bioRxiv : the preprint server for biology
|February 9, 2026
概括
这项研究表明,突肉瘤中的致癌性SS18::SSX融合蛋白可以独立于BAF复合体驱动转录. 针对EP300等联合激活剂为融合驱动的癌症提供了新的治疗策略.
科学领域:
- 在瘤学瘤学.
- 分子生物学分子生物学
- 癌症遗传学 癌症遗传学
背景情况:
- 突肉瘤是由SS18::SSX融合蛋白驱动的,它改变了BAF复合体的功能.
- 据认为,BAF复合体对于SS18::SSX驱动的基因激活至关重要.
研究的目的:
- 调查BAF活动对突肉瘤细胞存活率和SS18::SSX转录的要求.
- 为了确定SS18::SSX介导的瘤转录的替代机制.
主要方法:
- 针对BAF子单元的有针对性的降解和遗传删除.
- 对SS18::SSX目标基因表达的分析.
- 使用域特定的SS18::SSX突变.
- 药理上抑制EP300/CREBBP的作用.
主要成果:
- BAF复合体的丧失对瘤细胞活力和SS18::SSX向基因表达的影响很小.
- SS18::SSX 独立于 BAF 激活转录,依赖其 C 终端 QPGY 丰富的域.
- SS18::SSX与EP300相互作用以促进转录.
- EP300/CREBBP抑制抑制了SS18::SSX驱动的转录和减少了细胞存活率.
结论:
- 在突肉瘤中SS18::SSX介导的转录激活中,BAF活性并不必不可少.
- 突肉瘤依赖于联合激活剂招募 (例如,EP300) 来进行瘤转录,独立于BAF.
- 向EP300/CREBBP代表了针对突肉瘤和其他融合驱动癌症的潜在治疗策略.
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