Department of Marine Science, College of Natural Sciences, Incheon National University, Incheon 22012, South Korea.
Phyzen Genomics Institute, Seoul 08787, South Korea.
Sci Rep. 2017 Jan 10;7:40121. doi: 10.1038/srep40121.
The Kryptolebias marmoratus is unique because it is the only self-fertilizing hermaphroditic vertebrate, known to date. It primarily reproduces by internal self-fertilization in a mixed ovary/testis gonad. Here, we report on a high-quality genome assembly for the K. marmoratus South Korea (SK) strain highlighting the diversity and distribution of transposable elements (TEs). We find that K. marmoratus genome maintains number and composition of TEs. This can be an important genomic attribute promoting genome recombination in this selfing fish, while, in addition to a mixed mating strategy, it may also represent a mechanism contributing to the evolutionary adaptation to ecological pressure of the species. Future work should help clarify this point further once genomic information is gathered for other taxa of the family Rivulidae that do not self-fertilize. We provide a valuable genome resource that highlights the potential impact of TEs on the genome evolution of a fish species with an uncommon life cycle.
纹胸鮡是目前已知的唯一一种自行受精的雌雄同体脊椎动物，具有独特性。它主要通过混合卵巢/睾丸性腺中的内部自体受精进行繁殖。在这里，我们报告了韩国（SK）纹胸鮡的高质量基因组组装，重点介绍了转座元件（TEs）的多样性和分布。我们发现，纹胸鮡基因组保持了 TEs 的数量和组成。这可能是促进这种自交鱼类基因组重组的重要基因组属性，此外，除了混合交配策略外，它还可能代表一种有助于物种适应生态压力的进化机制。一旦为不进行自体受精的丽鱼科其他分类群收集了基因组信息，未来的工作应该有助于进一步阐明这一点。我们提供了一个有价值的基因组资源，突出了 TEs 对具有不常见生命周期的鱼类物种基因组进化的潜在影响。
