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首页> 外文期刊>Evolution: International Journal of Organic Evolution >All-male asexuality: Origin and maintenance of androgenesis in the asian clam corbicula
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All-male asexuality: Origin and maintenance of androgenesis in the asian clam corbicula

机译：全雄性无性：亚洲蛤cor的雄激素形成和维持

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摘要

Androgenesis is a rare form of asexual male reproduction found in disparate taxa across the Tree of Life. Phylogenetic analyses of mitochondrial genes suggest that androgenesis has arisen repeatedly in the Asian clam genus Corbicula. Two of these androgenetic species have been introduced to North America. Multiple lines of genetic evidence suggest that although nuclear recombination between these two species is rare, mitochondrial genome capture is a frequent consequence of androgenetic parasitism of heterospecific eggs. Egg parasitism may also rarely result in partial nuclear genome capture between closely related species of Corbicula, which provides a mechanism for the otherwise clonal species to avoid the deleterious effects of asexuality. Egg parasitism among congeners may explain why androgenesis has been maintained in Corbicula after fixation and has not yet led to population extinction. This mechanism also provides an explanation for the apparent multiple origins of androgenesis in Corbicula as seen on the mitochondrial DNA phylogeny. We suggest that a single androgenetic lineage may have repeatedly captured mitochondrial genomes (as well as portions of nuclear genomes) from various sexual species, resulting in several distinct androgenetic species with distantly related mtDNA genomes and divergent morphologies.
机译：雄激素生成是在生命之树的不同分类单元中发现的无性繁殖的一种罕见形式。线粒体基因的系统发育分析表明，雄激素在亚洲蛤Cor科Corbicula中反复出现。这些雄激素物种中的两个已经引入北美。多种遗传证据表明，尽管这两个物种之间的核重组很少见，但线粒体基因组捕获是异种卵雄激素寄生的常见后果。卵寄生还可能很少导致紧密相关的Corbicula物种之间的部分核基因组捕获，这为否则为克隆物种避免无性的有害作用提供了一种机制。同源物之间的卵寄生现象可能解释了为什么固定后在Corbicula中维持了雄激素生成并且尚未导致种群灭绝。从线粒体DNA系统发育上可以看出，这种机制还可以解释Corbicula中明显的多种雄激素生成起源。我们建议，一个单一的雄激素谱系可能已经重复捕获了来自各种有性物种的线粒体基因组（以及核基因组的一部分），从而导致了具有不同的mtDNA基因组和不同形态的几种不同的雄激素物种。

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