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对优化基因产品多样性的遗传和选择性约束

Daohan Jiang¹, Nevraj Kejiou², Yi Qiu²

¹Department of Quantitative and Computational Biology, University of Southern California, USA.

bioRxiv : the preprint server for biology

|August 2, 2024

概括

进化过程塑造了基因同型多样性. 一个新的数学模型显示,除了选择之外的因素,比如种群大小,会影响异构体的进化,这表明许多异构体可能来自非适应性过程.

科学领域:

进化生物学是进化的生物学.
遗传学是一个遗传学.
生物信息学是一种生物信息学.

背景情况:

由于转录后和翻译后的修改,基因产品可以存在于各种异构形式中.
绝大多数替代异构体的适应意义在很大程度上仍未知.
现有的理论框架不足以预测跨物种和基因的异形分布模式.

研究的目的:

开发一个数学模型,预测异构体的丰富分布.
研究塑造异形多样性的进化力量,包括突变,遗传漂移和选择.
为了确定异型分布是否与适应性或非适应性进化过程一致.

主要方法:

开发了一种数学模型,包括cis-acting loci,trans-acting factors,基因表达水平和异形衰变速率.
在不同种群大小,突变率和选择压力下模拟进化动态.
将模型预测与实证数据进行比较,特别是大肠杆菌中的A-to-IRNA编辑水平.

主要成果:

有效的种群大小和cis-acting loci的数量显著影响异构体的进化结果.
低于最佳的表型更有可能在小群体或具有众多cis作用位置的群体中演变.
对抗对 cis 和 trans 作用位点的选择压力可以限制基因产品多样性的优化.

结论:

基因异型的进化轨迹受直接选择之外的因素的影响.
非适应性解释可能解释了许多替代异构体的观察分布.
开发的理论框架为理解同类形态进化和多样性提供了基础.

关键词:

这是一个限制限制.进化论是一种进化论的理论.基因产品的多样性基因产品的多样性优化的优化优化优化.转录后的修改是转录后的修改.

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