Biogeographic history and high-elevation adaptations inferred from the mitochondrial genome of Glyptosternoid fishes (Sisoridae, Siluriformes) from the southeastern Tibetan Plateau.
Biogeographic history and high-elevation adaptations inferred from the mitochondrial genome of Glyptosternoid fishes (Sisoridae, Siluriformes) from the southeastern Tibetan Plateau.
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DOI：
10.1186/s12862-015-0516-9
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发表时间：
2015-10-28
影响因子：
3.4
通讯作者：
He S
中科院分区：
文献类型：
--
作者：
Ma X;Kang J;Chen W;Zhou C;He S
中华沟塘鳢的分布仅限于青藏高原及其周边地区的河流，特别是藏东南部的流域。因此，Glyptosternoid鱼类是理想的重建地质历史的西藏东南部的排水模式和线粒体遗传适应高海拔。我们的系统发育结果支持单系的Sisoridae和Glyptosternoid鱼类。重建的祖先地理分布表明，早在中新世晚期（约2000年），古雕胸龙类广泛分布于喜马拉雅山东部雅鲁藏布江流域和青藏高原地区。5.5 Ma）。我们发现，Glyptosternoid鱼类谱系有一个较高的比率，非同义同义替换比那些发现在非Glyptosternoids。另外，COX 1的ωpss值为10.73，显著高于1（p值0.0002），表明在中国雕茎鱼类共同祖先分支中存在正选择。我们还在特化物种的分支中发现了正选择的其他特征。这些结果意味着线粒体遗传适应高海拔的Glyptosternoids。我们重建了一个可能的情况下，西藏东南部的排水模式的基础上，适应地理分布的中国Glyptosternoids在这个流域。Glyptosternoids可能在线粒体基因中经历了加速的进化速率，这是由正选择驱动的，以更好地适应青藏高原的高海拔环境。本文的在线版本（doi：10.1186/s12862-015-0516-9）包含补充材料，可供授权用户使用。
The distribution of the Chinese Glyptosternoid catfish is limited to the rivers of the Tibetan Plateau and peripheral regions, especially the drainage areas of southeastern Tibet. Therefore, Glyptosternoid fishes are ideal for reconstructing the geological history of the southeastern Tibet drainage patterns and mitochondrial genetic adaptions to high elevations. Our phylogenetic results support the monophyly of the Sisoridae and the Glyptosternoid fishes. The reconstructed ancestral geographical distribution suggests that the ancestral Glyptosternoids was widely distributed throughout the Brahmaputra drainage in the eastern Himalayas and Tibetan area during the Late Miocene (c. 5.5 Ma). We found that the Glyptosternoid fishes lineage had a higher ratio of nonsynonymous to synonymous substitutions than those found in non-Glyptosternoids. In addition, ωpss was estimated to be 10.73, which is significantly higher than 1 (p-value 0.0002), in COX1, which indicates positive selection in the common ancestral branch of Glyptosternoid fishes in China. We also found other signatures of positive selection in the branch of specialized species. These results imply mitochondrial genetic adaptation to high elevations in the Glyptosternoids. We reconstructed a possible scenario for the southeastern Tibetan drainage patterns based on the adaptive geographical distribution of the Chinese Glyptosternoids in this drainage. The Glyptosternoids may have experienced accelerated evolutionary rates in mitochondrial genes that were driven by positive selection to better adapt to the high-elevation environment of the Tibetan Plateau. The online version of this article (doi:10.1186/s12862-015-0516-9) contains supplementary material, which is available to authorized users.