一个可编程的命运决定格局是酵母单细胞衰老的基础
Yang Li1, Yanfei Jiang1, Julie Paxman1
1Section of Molecular Biology, Division of Biological Sciences, University of California San Diego, La Jolla, CA 92093, USA.
Science (New York, N.Y.)
|July 18, 2020
概括
细胞衰老包括染色体和线粒体的变化. 这些途径之间的相互作用创造了一个表观遗传景观,引导细胞进入不同的衰老状态,并通过基因工程延长寿命.
科学领域:
- 细胞和分子生物学
- 老龄化研究
- 酵母遗传学
背景情况:
- 细胞衰老的特征是保存过程,如染色体不稳定和线粒体衰退.
- 不同的信号通路控制着染色体和线粒体的功能,但它们在细胞衰老中的相互作用仍然不清楚.
研究的目的:
- 研究个体细胞中决定主导衰老过程 (染色体与线粒体) 的机制.
- 阐明染色体沉默和线粒体通路在塑造衰老过程中的作用.
- 探索利用这些途径延长细胞寿命的可能性.
主要方法:
- 使用定量模型来描述酵母复制衰老的表观遗传.
- 分析了染色体沉默和线粒体通路之间的相互作用.
- 使用基因工程策略以老化模式为指导,创造新的老化状态.
主要成果:
- 识别了具有多个平衡状态的表观遗传景观,代表了不同的终端衰老表型.
- 已证实景观结构驱动单细胞分化到生命早期的特定衰老状态.
- 证明这种命运决定是强大的并且对细胞内噪声不敏感.
- 成功设计了一个长寿的平衡状态.
结论:
- 染色体和线粒体路径之间的相互作用建立了一个表观遗传景观,决定了细胞衰老的轨迹.
- 细胞衰老的命运早已确立,
- 向表观遗传场景提供了一个可行的策略,
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