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在生命树上的基因组分歧

Rowan Hart^1,2, Nancy A Moran³, Howard Ochman¹

¹Department of Molecular Biosciences, University of Texas at Austin, Austin, TX 78712.

Proceedings of the National Academy of Sciences of the United States of America

|February 27, 2025

概括

全基因组的序列分歧有助于识别物种. 细胞物种通常表现出<1%的分歧,而有1%分歧的核细胞物种仍然可以交配,表明它们是同一种物种.

科学领域:

基因组学就是基因组学.
进化生物学进化生物学
微生物学微生物学

背景情况:

核酸序列数据越来越多地用于物种识别,即使没有物理标本.
全基因组序列分歧和物种状况之间的关系尚不清楚,尤其是在真核生物之间.
Prokaryotic 和 eukaryotic 的基因流动机制有所不同,这可能会影响序列分离与生殖隔离的关系.

研究的目的:

探索基因组范围的序列分歧和真核生物中的物种界限之间的对应.
为了比较原核生物和真核生物之间的物种划分的基因组标准.

主要方法:

对已知的真核生物物种 (动物,植物,真菌) 的全基因组序列分离数据的分析.
基于同源基因交换的真核生物分歧水平与已建立的细菌物种定义的比较.
对序列分歧值的评估,以区分两种领域中的物种.

主要成果:

细胞物种表现出很低的物种内基因序列分歧 (在蛋白质编码区域<1%).
在某些情况下,真核生物姐妹物种之间的差异与同类物种之间的差异相似或小于差异.
与真核生物相比,细菌物种在物种内部和物种之间显示出明显更高的分歧水平.

结论:

>1%的全基因组序列分歧值可能表明在真核生物中存在单独的物种.
具有1%分歧的原生物种群仍然可以重组并被认为是相同的物种.
基因组分歧模式在原核生物和真核生物之间存在根本的差异,需要不同的物种划分方法.

关键词:

生物多样性生物多样性基因重组是基因重组的过程.基因组分歧基因组分歧种类的界限种类的界限

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