促进剂平衡的Rpd3 HDAC复合体在营养过渡时协调全球染色体重编程
bioRxiv : the preprint server for biology
|February 27, 2026
概括
基因脱乙酶Rpd3在酵母中的营养转移期间重编程染色质,平衡基因表达. 这确保了适当的代谢适应,通过控制基因活性和维持细胞功能.
科学领域:
- 分子生物学分子生物学
- 酵母遗传学 酵母遗传学
- 染色体生物学 染色体生物学
背景情况:
- 在*Saccharomyces cerevisiae*中,代谢灵活性依赖于适应性转录性重新连接.
- 基因脱乙酶 (HDACs) 在调节基因表达方面发挥作用,但它们在代谢过渡期间的确切功能尚不清楚.
- 在活性促进剂中HDAC丰富的悖论需要解决.
研究的目的:
- 为了研究基因组脱乙酶Rpd3在调解营养依赖色素重编程中的作用.
- 了解Rpd3如何协调转录关闭和在代谢过渡期间的全球乙化平衡.
- 阐明HDACs作为代谢门卫的机制.
主要方法:
- 对染色体免疫沉降和基因表达的全基因组分析.
- 涉及缺乏Rpd3或其子单元Pho23.3的酵母突变体的研究.
- 评估基因素乙化水平 (H3K9ac) 和乙转移酶Gcn5.5的活性.
主要成果:
- Rpd3复合体在基因促进体和细胞中调节快速,可逆的基因素脱甲基化,微调转录.
- Rpd3,特别是Rpd3L复合体,定位在富含H3K9ac和Gcn5.5的活性基因促进体上.
- 营养物质的转移导致Gcn5脱离和Rpd3介导的脱乙基化,从而强制执行基因抑制.
- 失去Rpd3或Pho23会导致饥饿期间持续增长基因表达,以及通过葡萄糖抑制呼吸基因激活.
结论:
- 在酵母中,Rpd3充当了依赖营养素的染色质重编程的关键调解者.
- HDACs充当代谢守门员,将营养素的可用性与转录控制相结合.
- 这种机制确保了代谢过渡期间的转录忠实性,解决了HDAC丰富悖论.
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