环境干扰增加了基因表达的变异性,并揭露了转录强度的遗传调节
bioRxiv : the preprint server for biology
|February 27, 2026
概括
环境压力增加了果的基因表达变异性,揭示了这一特征的遗传调节. 这种基因调节层与平均特征调节不同,具有独特的进化约束.
科学领域:
- 基因组学就是基因组学.
- 进化生物学 进化生物学
- 发展生物学 发展生物学
背景情况:
- 环境变化可以通过影响平均特征值及其可变性来改变生物的特征.
- 现型变异性 (环境强度) 的环境诱导变化的遗传基础尚未得到充分理解.
研究的目的:
- 调查基因表达变异性中环境诱导的变化是否受到遗传调节.
- 在 *Drosophila melanogaster* 中,在饮食压力下表达变异性的遗传结构的特征.
主要方法:
- 从Drosophila melanogaster*收集了近2000个匹配的基因组和转录组.
- 将人口暴露在高糖饮食中,以诱导饮食压力.
- 基因表达变异性的量化变化和识别的表达变异性的定量特征位点 (veQTLs).
主要成果:
- 饮食压力导致基因表达变异性的转录组范围的增加,除了关键的发育途径.
- 确定了表达变异性 (veQTLs) 的普遍遗传调节,这在很大程度上取决于环境.
- 发现这些veQTL与调节平均表达的位置相比,具有明显的功能和进化约束.
- 观察到,veQTLs赋予的过度强度在饮食干扰下可能是有害的.
结论:
- 基因表达的变异性是生物对环境变化反应的关键组成部分.
- 发现了一种独特的基因层调节表达变异性,与平均表达的调节分开.
- 这种表型调节层在进化上受到限制,并且在平均特征效应之外发挥着重要作用.
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