在多种类型的Saccharomyces cerevisiae菌株中,对保存的HOG通路具有惊人的调节可塑性
bioRxiv : the preprint server for biology
|January 9, 2026
概括
野生酵母菌株中的Hog1蛋白具有比以前已知的更广泛的应激保护作用,与实验室菌株不同. 这揭示了酵母菌应激反应途径的显著进化可塑性.
科学领域:
- 分子生物学分子生物学
- 酵母遗传学 酵母遗传学
- 信号传输 信号传输
背景情况:
- 甲基因激活蛋白激酶 (MAPKs) 在物种中表现出不同的调节作用.
- 在*Saccharomyces cerevisiae*中,高透性糖醇 (HOG) 网络通常被研究为透特异性.
- 其他生物体中的Hog1基因对多种压力类型做出反应,与实验室酵母菌株不同.
研究的目的:
- 为了研究Hog1在压力交叉保护和基因表达中的作用,在实验室和野生*Saccharomyces cerevisiae*菌株中.
- 要确定*S. cerevisiae* Hog1的透特异性是否是一种祖先特征或是特定于血统的适应.
- 为了发现实验室酵母菌株中丢失的潜在压力信号功能.
主要方法:
- 在实验室和野生的S. cerevisiae菌株中*hog1Δ*突变的表型分析.
- 对交叉应力保护反应的评估.
- 在各种压力条件下对基因表达的比较分析.
主要成果:
- 与实验室菌株相比,Hog1在野生酵母菌株中调解了扩展的交叉应力保护.
- 在野生菌株中发现了大量的Hog1依赖基因,用于非奥斯摩斯应激,实验室菌株中缺少.
- 野生菌株中Hog1的非奥斯摩斯应激调节因子与其奥斯摩斯应激反应不同,涉及非正规的细胞质功能.
结论:
- 在*Saccharomyces cerevisiae*中的Hog1 MAPK通路显示出相当大的物种内可塑性.
- 从专家向通用压力信号的进化过渡是可行的,在这个保存的路径.
- 野生酵母菌株提供了对可能在实验室菌株中丢失的压力信号机制的宝贵见解.
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