Evolutionary rates are correlated between cockroach symbionts and mitochondrial genomes
Evolutionary rates are correlated between cockroach symbionts and mitochondrial genomes
复制标题
蟑螂共生体和线粒体基因组之间的进化速率相关
DOI：
10.1098/rsbl.2019.0702
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发表时间：
2020-01-29
期刊：
影响因子：
3.3
通讯作者：
Lo, Nathan
中科院分区：
文献类型：
--
作者：
Arab, Daej A.;Bourguignon, Thomas;Lo, Nathan
细菌内共生体在强烈的宿主驱动选择下进化。影响宿主进化的因素可能以类似的方式影响共生体，可能导致宿主和共生体的分子进化速率之间的相关性。虽然有证据表明线粒体和核基因之间的速率相关，但缺乏对宿主和共生体的类似研究。在这里，我们证明了一种内共生体（cuenoti blattabobacterium cuenoti）的基因组与其宿主（蟑螂）的线粒体基因组之间的分子率的相关性。利用多株库诺伊布氏蜚蠊的部分基因组数据，比较了55对蜚蠊/共生体的系统发育关系和进化速率。根据相同的母系和细胞质遗传模式，推断的库诺布氏螺旋体及其宿主的线粒体基因组的系统发育在很大程度上是一致的。通过比较根到尖端的距离和比较系统发育上独立的物种对的分支长度，我们发现了两个基因组的进化速率之间的相关性。我们的研究结果强调了长期共生对每个共生伙伴的生物学的深远影响。
Bacterial endosymbionts evolve under strong host-driven selection. Factors influencing host evolution might affect symbionts in similar ways, potentially leading to correlations between the molecular evolutionary rates of hosts and symbionts. Although there is evidence of rate correlations between mitochondrial and nuclear genes, similar investigations of hosts and symbionts are lacking. Here, we demonstrate a correlation in molecular rates between the genomes of an endosymbiont (Blattabacterium cuenoti) and the mitochondrial genomes of their hosts (cockroaches). We used partial genome data for multiple strains of B. cuenoti to compare phylogenetic relationships and evolutionary rates for 55 cockroach/symbiont pairs. The phylogenies inferred for B. cuenoti and the mitochondrial genomes of their hosts were largely congruent, as expected from their identical maternal and cytoplasmic mode of inheritance. We found a correlation between evolutionary rates of the two genomes, based on comparisons of root-to-tip distances and on comparisons of the branch lengths of phylogenetically independent species pairs. Our results underscore the profound effects that long-term symbiosis can have on the biology of each symbiotic partner.