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首页> 外文期刊>Polar biology >Mitochondrial genome diversity and population mitogenomics of polar cod (Boreogadus saida) and Arctic dwelling gadoids
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Mitochondrial genome diversity and population mitogenomics of polar cod (Boreogadus saida) and Arctic dwelling gadoids

机译：极鳕鱼（Boreogadus）和北极居住毒素的线粒体基因组多样性和群体毒蛛

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High-latitude fish typically exhibit a narrow thermal tolerance window, which may pose challenges when coping with temperatures that shift outside of a species' range of tolerance. Due to its role in aerobic metabolism and energy balance, the mitochondrial genome is likely critical for the acclimation and adaptation to differing temperature regimes in marine ectotherms. As oceans continue to warm, there is growing need to understand the ability of organisms to respond to changing environmental conditions given evidence that some species, in particular cold-water species, may already be experiencing difficulties. To assess how Arctic gadids in Alaska have responded to differential thermal preferences in the past and how regions are interconnected, we sequenced complete mitochondrial genomes for four Arctic gadids to determine the distribution of mitochondrial diversity and population-level structure as well as to detect signatures of selection acting on the mitochondrial genome. We found little population-level structure within all four species with the clear exception of Gulf of Alaska saffron cod (Eleginus gracilis). Northern localities exhibited higher levels of genetic diversity and primarily northern lineages were observed within polar cod (Boreogadus saida) and saffron cod, likely reflecting asymmetrical dispersal and potentially admixture of distinct lineages via ocean currents. The main evolutionary force shaping the evolution of the mitogenome appears to be purifying selection, but we also identified potential positive selection of candidate amino acid replacements primarily in complex I (ND genes) in polar cod. The high levels of mitochondrial diversity observed in our study and large population size may provide this species with the ability to respond evolutionarily (i.e. long-term) to a changing environment.
机译：高纬度鱼通常呈现窄的热容窗，这可能在应对围绕物种耐受范围之外的温度时姿态姿态。由于其在有氧代谢和能量平衡中的作用，线粒体基因组可能对加适应和适应对海洋疗法的不同温度制度至关重要。随着海洋继续温暖，越来越需要了解有机体对改变环境条件的能力，因为有证据表明某些物种，特别是冷水物种，可能已经存在困难。为了评估阿拉斯加的北极毒素在过去的差​​异热偏好以及区内互连的差异热偏好程度，我们测序了四个北极粘膜的完全线粒体基因组，以确定线粒体多样性和人口水平结构的分布以及检测签名作用于线粒体基因组的选择。我们在所有四种物种中发现了小人物级结构，清晰的Alaska Saffron Cod（egeginus Gracilis）的清楚。北方地区在极鳕鱼（Boreogadus Seena）和藏红花鳕鱼中，观察到更高水平的遗传多样性，主要观察到北部血管分析，这可能反映了通过海洋电流的不对称分散和潜在的独特谱系的混合物。形成促催化剂的进化的主要进化力似乎是纯化的选择，但我们还确定了主要在极鳕鱼中的复合I（ND基因）中的候选氨基酸置换的潜在阳性选择。在我们的研究中观察到的高水平线粒体多样性和大群人的大小可以提供这种物种，具有响应进化的能力（即长期）到不断变化的环境。

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