在模拟的微重力和银压力下,Streptococcus mutans的自适应转录重塑揭示了人工环境中的进化创新
M C Fernander1, K R McClure1, B T Sanders1
1Department of Biology North Carolina A&T State University, Greensboro, NC USA.
概括
微生物对太空飞行条件有不同的适应. 模拟的微重力单独允许Streptococcus mutans的多样化的进化路径,而微重力与酸银有利于统一的生理变化.
科学领域:
- 微生物学 微生物学
- 进化生物学 进化生物学
- 天体生物学 天体生物学
背景情况:
- 了解微生物适应新的环境,如太空飞行至关重要.
- 太空飞行息地面临着独特的挑战:重力变化,氧化应激和消毒剂.
- 突变性链球菌 (Streptococcus mutans) 是一个相关的模型生物体,用于研究封闭环境中的适应性.
研究的目的:
- 调查Streptococcus mutans对模拟微重力 (sMG) 和与银酸盐 (sMGAg) 结合微重力的适应性反应.
- 整合基因组,转录组和表型数据,以了解在与太空飞行相关的条件下微生物进化.
主要方法:
- 在正常重力 (NG),sMG和sMGAg下100天内进化的Streptococcus mutans种群.
- 生成的转录和表型数据集.
- 整合了新的数据与先前的全基因组测序数据.
主要成果:
- sMG 种群表现出各种生理和转录变化,这些变化仅由基因组学无法预测,包括各种反应性氧物种 (ROS) 反应和减少碳水化合物代谢.
- sMGAg群体表现出与激活的氧化还原酶和金属处理通路,改变的ROS水平和增强的酸盐减少的融合进化.
- 没有单一的数据类型 (基因组,转录组或表型) 足以完全捕捉适应性反应.
结论:
- 不同的物理和化学压力因素在微生物中驱动着不同的进化轨迹.
- 微重力单独允许更广泛的适应策略,而微重力与酸银相结合则促进更均的生理状态.
- 综合的多层次数据集对于准确地描述微生物在极端或非陆地环境中的适应是必不可少的.
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