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通过cBAF,pBAF和gBAF复合体对多结相关的基因素标记的微分调制
Mary Bergwell1, JinYoung Park1,2, Jacob G Kirkland3,2
1Cell Cycle and Cancer Biology Program, Oklahoma Medical Research Foundation, Oklahoma City, OK, USA.
Life science alliance
|August 29, 2024
概括
佳能BAF (cBAF) 综合体独特地去除了Nkx2-9位点上的压制性组织蛋白标记,与其他SWI/SNF变体不同. 这一发现凸显了cBAF在反对多相关修饰的特殊作用.
科学领域:
- 分子生物学分子生物学
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
- 染色体生物学 染色体生物学
背景情况:
- 染色体调节器通过改变染色体结构来控制基因转录.
- 哺乳动物SWI/SNF复合体是关键的ATP依赖的染色质重塑剂.
- 在小鼠胚胎干细胞中存在三个主要形式:cBAF,pBAF和gBAF.
研究的目的:
- 研究cBAF,pBAF和gBAF复合体在调节双价Nkx2-9位点中的不同作用.
- 为了确定特定的BAF复合体是否可以去除多镇压标记.
主要方法:
- 利用FIRE-Cas9用于dCas9介导的特定BAF复合物的诱导性招募到Nkx2-9位置.
- 分析了基因素修饰 (H3K27me3) 和多组蛋白占用率的变化.
- 评估核细胞占用率,以区分其作用与基因素标记去除.
主要成果:
- 招募cBAF复合体导致H3K27me3标记和相关的多蛋白显著减少.
- pBAF和gBAF复合物并没有导致这些压制性标记的类似损失.
- 仅核细胞占用率的变化无法解释观察到的组织蛋白修饰的损失.
结论:
- 规范性BAF (cBAF) 复合体具有独特的功能,可以直接对抗多结相关的质子修饰.
- 这一功能并非由聚烯相关BAF (pBAF) 或GLTSCR相关BAF (gBAF) 复合体共享.
- 在对抗压制性标记方面cBAF的特定作用为染色体调节提供了新的见解.
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