350 My of Mitochondrial Genome Stasis in Mosses, an Early Land Plant Lineage
350 My of Mitochondrial Genome Stasis in Mosses, an Early Land Plant Lineage
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DOI：
10.1093/molbev/msu199
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发表时间：
2014-10-01
影响因子：
10.7
通讯作者：
Goffinet, Bernard
中科院分区：
文献类型：
--
作者：
Liu, Yang;Medina, Rafael;Goffinet, Bernard
在陆地植物中，被子植物具有结构上最不稳定的线粒体基因组。相比之下，所谓的早期陆地植物（如苔藓）似乎有完全静止的mt染色体。本研究收集了12种藓类植物的mt基因组，分析了陆地植物mt基因保守序列和序列的系统发育深度，以及离散序列重复序列与基因顺序稳定性的相关性。大多数苔藓的mt基因组约为100 kb，是陆地植物中最小的。根据分化时间的估计，苔藓mt基因组结构几乎冻结了350万年，在整个宏观进化树中只检测到两个独立的基因丢失和一个基因重新定位。这是迄今为止在植物谱系中发现的最长的mt基因组停滞期。完全缺乏基因间重复序列，被认为是基因组内重组所必需的，可能解释了苔藓mt基因组的进化稳定性。
Among land plants, angiosperms have the structurally most labile mitochondrial (mt) genomes. In contrast, the so-called early land plants (e.g., mosses) seem to have completely static mt chromosomes. We assembled the complete mt genomes from 12 mosses spanning the moss tree of life, to assess 1) the phylogenetic depth of the conserved mt gene content and order and 2) the correlation between scattered sequence repeats and gene order lability in land plants. The mt genome of most mosses is approximately 100 kb in size, and thereby the smallest among land plants. Based on divergence time estimates, moss mt genome structure has remained virtually frozen for 350 My, with only two independent gene losses and a single gene relocation detected across the macroevolutionary tree. This is the longest period of mt genome stasis demonstrated to date in a plant lineage. The complete lack of intergenic repeat sequences, considered to be essential for intragenomic recombinations, likely accounts for the evolutionary stability of moss mt genomes.