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从元基因组组装基因组估计有效种群大小的挑战

Xiaojun Wang¹, Xiaoyuan Feng^1,2

¹Shenzhen Research Institute of the Chinese University of Hong Kong, Shenzhen, China.

Frontiers in microbiology

|January 22, 2024

概括

基因组组装基因组 (MAGs) 经常低估有效种群大小 (N),因为遗传变异缺失. 研究人员建议在使用MAGs进行微生物进化研究时谨慎使用.

科学领域:

微生物生态学微生物生态学
进化生物学进化生物学
基因组学就是基因组学.

背景情况:

实际种群大小 (N) 对于理解微生物生态动态以及选择与漂移之间的平衡至关重要.
估计N通常需要来自密切相关的基因组的中性遗传多样性,但培养困难限制了许多 prokaryotes.
基因组组装基因组 (MAGs) 为基因组数据提供了高通量替代方案,但它们对N估计的准确性尚未得到验证.

研究的目的:

评估MAG的可靠性,以估计微生物种群中的有效种群大小 (N).
为了比较来自MAGs的N估计与传统的基于隔离物的方法.
确定导致MAG和分离物之间的N估计差异的因素.

主要方法:

使用66个孤立菌株和29个MAG检查了热球菌属.
在孤立和MAG群体之间比较了家族遗传分布和平均核酸标识 (ANI).
分析的N估计来自于多个细菌系的分离和MAG数据.

主要成果:

与Thermococcus属内的孤立种群相比,MAG种群的N估计总是较低.
这种N低估趋势也在其他三种细菌系的MAG种群中观察到.
低估可能是由于MAG中遗传变异的代表性不足,包括等位基因频率数据和可变基因组段.

结论:

由于捕捉遗传多样性的固有局限性,MAG可能会低估有效种群大小 (N).
在依赖精确的核酸水平多样性和基因组组合的进化研究中使用MAG时建议谨慎.
需要进一步的验证和方法改进,才能从MAG中得出可靠的进化推理.

关键词:

实际人口规模实际人口规模遗传漂移是一种遗传漂移.转基因组学是指转基因组学.微生物进化过程中的微生物.自然选择自然选择

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