在动物进化过程中,新陈代谢率是否会影响全基因组的氨基酸组成?
Wei Wang1, De-Xing Zhang1,2
1State Key Laboratory of Integrated Management of Pest Insects and Rodents, Institute of Zoology, Chinese Academy of Sciences, Beijing, China.
Evolution letters
|February 5, 2025
概括
动物的新陈代谢率影响蛋白质中的氨基酸频率,这表明能源效率推动了进化变化. 高代谢率与不同物种中使用低能量氨基酸的增加相关.
科学领域:
- 进化生物学 进化生物学
- 分子生物学分子生物学
- 生物化学 生化学
背景情况:
- 人们认为自然选择通过将蛋白质生物合成的能源成本降至最低来优化蛋白质体中的氨基酸使用.
- 现有的假设解释了物种内部的氨基酸频率变化,而不是跨物种的差异.
- 代谢率在塑造全基因组氨基酸频率的作用需要在不同的动物血统中进行研究.
研究的目的:
- 测试"代谢率假设",将代谢率与全基因组氨基酸频率联系起来.
- 为了调查代谢速率是否影响跨物种的氨基酸使用.
- 了解塑造动物蛋白质组中氨基酸频率的进化压力.
主要方法:
- 在蛋白质组和代谢速率数据上进行了综合类遗传学比较分析.
- 分析了来自130个类别的166个物种的数据.
- 研究了休息代谢率 (RMR) 和氨基酸频率之间的关系,并控制了基因组特征.
主要成果:
- 休息代谢率 (RMR) 与动物谱系中氨基酸频率变化有显著的相关性.
- 这种联系与基因组因素 (如GC含量和密码体使用偏差) 相似或更强.
- 具有较高RMR的物种表现出更高频率的低能耗氨基酸,支持代谢率假设.
结论:
- 代谢率是决定动物种类中氨基酸频率的一个重要因素.
- RMR和氨基酸频率的相关进化表明了适应性的进化驱动因素.
- 了解氨基酸频率需要将新陈代谢率与其他多层次特征整合起来,因为没有单一的预测因素足够.
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