Endangered island endemic plants have vulnerable genomes.,Communications Biology

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Endangered island endemic plants have vulnerable genomes.
Communications Biology ( IF 5.2 ) Pub Date : 2019-06-27 , DOI: 10.1038/s42003-019-0490-7
Tomoko Hamabata ₁ , Gohta Kinoshita ₂ , Kazuki Kurita ₂ , Ping-Lin Cao ₁ , Motomi Ito ₃ , Jin Murata ₄ , Yoshiteru Komaki ₄ , Yuji Isagi ₂ , Takashi Makino ₁

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Loss of genetic diversity is known to decrease the fitness of species and is a critical factor that increases extinction risk. However, there is little evidence for higher vulnerability and extinction risk in endangered species based on genomic differences between endangered and non-endangered species. This is true even in the case of functional loci, which are more likely to relate to the fitness of species than neutral loci. Here, we compared the genome-wide genetic diversity, proportion of duplicated genes (P D), and accumulation of deleterious variations of endangered island endemic (EIE) plants from four genera with those of their non-endangered (NE) widespread congeners. We focused on exhaustive sequences of expressed genes obtained by RNA sequencing. Most EIE species exhibited significantly lower genetic diversity and P D than NE species. Additionally, all endangered species accumulated deleterious variations. Our findings provide new insights into the genomic traits of EIE species.

中文翻译：

濒危岛屿特有植物的基因组很脆弱。

众所周知，遗传多样性的丧失会降低物种的适应性，并且是增加灭绝风险的关键因素。然而，由于濒危物种和非濒危物种之间的基因组差异，几乎没有证据表明濒危物种具有更高的脆弱性和灭绝风险。即使在功能基因座的情况下也是如此，功能基因座比中性基因座更可能与物种的适应性相关。在这里，我们比较了四个属的濒危岛屿特有（EIE）植物与其非濒危（NE）广泛同源植物的全基因组遗传多样性、重复基因（PD）的比例以及有害变异的积累。我们重点关注通过 RNA 测序获得的表达基因的详尽序列。大多数 EIE 物种表现出比 NE 物种显着较低的遗传多样性和 PD。此外，所有濒临灭绝的物种都积累了有害的变异。我们的研究结果为 EIE 物种的基因组特征提供了新的见解。

更新日期：2019-06-27

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