非致命的有害突变诱导的压力加速了细菌的衰老
Maryam Kohram1, Amy E Sanderson1, Alicia Loui1
1Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, PA 15260.
概括
在大肠杆菌中的功能丧失突变引发应激反应以适应. 某些突变,比如ATP合成酶,会导致生长速度减慢,但会显示个体细胞的"衰老成本",影响人口的弹性.
科学领域:
- 微生物学 微生物学
- 遗传学 是一个遗传学.
- 细胞生物学 细胞生物学
背景情况:
- 微生物适应依赖于随机突变发生,通常导致基因丢失.
- 有害的突变会触发细胞应激反应 (全静止) 以求生存.
研究的目的:
- 为了研究65个基因缺失对大肠杆菌在各种环境中的生长的影响.
- 分析特定突变的转录组变化和单细胞表型,包括ATP合成酶子单元缺失.
主要方法:
- 在三种环境中对65种单基因缺失突变菌在大肠杆菌中的系统选.
- 选择突变的转录组概况,重点关注腺三酸盐 (ATP) 合成酶子单元的删除.
- 在删除ATP合成酶α子单元 (ΔatpA) 细胞中的生长,增殖和衰老的单细胞分析.
主要成果:
- 突变者表现出环境和基因特异性的转录组重组.
- ΔatpA细胞表现出较高的代谢率,但比野生类型的细胞生长速度较慢.
- 单个DatpA细胞表现出早期衰老和后复制状态,尽管正常增殖.
结论:
- 细菌适应涉及到人口弹性和单个细胞之间的权衡.
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