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<p>Despite most eel gobies (Gobionellidae: Amblyopinae) have inhabited brackish or marine waters, few species (such as <i>Taenioides</i> sp.) have been found to invade multiple inland freshwaters via artificial water transfer projects. The habitat transfers from brackish water to freshwater zones of <i>Taenioides</i> sp. have caused severe damage to Chinese aquatic ecosystems in recent years. Unfortunately, the molecular mechanism underlying freshwater invasion remains poorly understood. Considering changes of environmental factors, especially salinity, are bound to adjust the demands for energy affected by mitochondria via oxidative phosphorylation, 13 Amblyopinae mitogenomes were compared, including the newly assembled <i>Taenioides</i> sp. mitogenome in this study. Comparative mitogenomic analyses revealed a highly conserved structure, composition and arrangements, with the exception of variable control region (CR). All of the CRs possessed tandem repeat sequences except <i>Trypauchenopsis</i> sp. G341, differing in motifs and number of copies, which was the dominant factor resulting in length heterogeneity of CR. The phylogenetic trees reconfirmed the paraphyletic origin of Amblyopinae with respect to Oxudercinae, supporting that these two subfamilies should be merged as an expansion of phenotypic variation within the “terrestrial goby” clade. Furthermore, four protein coding genes (<i>COI</i>, <i>ND3</i>, <i>ND5</i> and <i>Cyt b</i>) in <i>Taenioides</i> sp. mitogenome have experienced adaptive evolution, indicating their important roles in enhancing the efficiency of ATP production to cope with the osmotic regulation adjustment and reach its current widespread distribution in multiple inland freshwaters of China. These results revealed the functional importance of mitochondrial genes, and provided fresh insights into the molecular mechanisms underlying the freshwater invasion. Also, our results may provide critical reference value for the future control of other invasive species.</p>

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Comparative mitogenomes of Amblyopinae (Gobiiformes: Gobionellidae) and freshwater adaptation in Taenioides sp.

  • 期刊论文

  • 发表日期：

    2025年5月1日

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  • Li Gong,
  • Kaixin Wang,
  • Tianwei Liu,
  • An Xu,
  • Nannan Zhang,
  • Wenchao Wu,
  • Liqin Liu,
  • Jing Liu,
  • Fenghui Li,
  • Zhenming Lü

摘要

Despite most eel gobies (Gobionellidae: Amblyopinae) have inhabited brackish or marine waters, few species (such as Taenioides sp.) have been found to invade multiple inland freshwaters via artificial water transfer projects. The habitat transfers from brackish water to freshwater zones of Taenioides sp. have caused severe damage to Chinese aquatic ecosystems in recent years. Unfortunately, the molecular mechanism underlying freshwater invasion remains poorly understood. Considering changes of environmental factors, especially salinity, are bound to adjust the demands for energy affected by mitochondria via oxidative phosphorylation, 13 Amblyopinae mitogenomes were compared, including the newly assembled Taenioides sp. mitogenome in this study. Comparative mitogenomic analyses revealed a highly conserved structure, composition and arrangements, with the exception of variable control region (CR). All of the CRs possessed tandem repeat sequences except Trypauchenopsis sp. G341, differing in motifs and number of copies, which was the dominant factor resulting in length heterogeneity of CR. The phylogenetic trees reconfirmed the paraphyletic origin of Amblyopinae with respect to Oxudercinae, supporting that these two subfamilies should be merged as an expansion of phenotypic variation within the “terrestrial goby” clade. Furthermore, four protein coding genes (COI, ND3, ND5 and Cyt b) in Taenioides sp. mitogenome have experienced adaptive evolution, indicating their important roles in enhancing the efficiency of ATP production to cope with the osmotic regulation adjustment and reach its current widespread distribution in multiple inland freshwaters of China. These results revealed the functional importance of mitochondrial genes, and provided fresh insights into the molecular mechanisms underlying the freshwater invasion. Also, our results may provide critical reference value for the future control of other invasive species.