Mitochondrial OXPHOS genes provides insights into genetics basis of hypoxia adaptation in anchialine cave shrimps

Huayun Guo; Hao Yang; Yitao Tao; Dan Tang; Qiong Wu; Zhengfei Wang; Bo-Ping Tang

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자료유형: 학술저널

저자정보: Huayun Guo (Yancheng Teachers University) Hao Yang (Yancheng Teachers University) Yitao Tao (Yancheng Teachers University) Dan Tang (Yancheng Teachers University) Qiong Wu (Yancheng Teachers University) Zhengfei Wang (Yancheng Teachers University) Bo-Ping Tang (Yancheng Teachers University)

저널정보: 한국유전학회 Genes & Genomics Genes & Genomics Vol.40 No.11

발행연도: 2018.1

수록면: 1,169 - 1,180 (12page)

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Cave shrimps from the genera Typhlatya, Stygiocaris and Typhlopatsa (TST complex) comprises twenty cave-adapted taxa, which mainly occur in the anchialine environment. Anchialine habitats may undergo drastic environmental fluctuations, including spatial and temporal changes in salinity, temperature, and dissolved oxygen content. Previous studies of crustaceans from anchialine caves suggest that they have possessed morphological, behavioral, and physiological adaptations to cope with the extreme conditions, similar to other cave-dwelling crustaceans. However, the genetic basis has not been thoroughly explored in crustaceans from anchialine habitats, which can experience hypoxic regimes. To test whether the TST shrimpcomplex hypoxia adaptations matched adaptive evolution of mitochondrial OXPHOS genes. The 13 OXPHOS genes from mitochondrial genomes of 98 shrimps and 1 outgroup were examined. For each of these genes was investigated and compared to orthologous sequences using both gene (i.e. branch-site and Datamonkey) and protein (i.e. TreeSAAP) level approaches. Positive selection was detected in 11 of the 13 candidate genes, and the radical amino acid changes sites scattered throughout the entire TST complex phylogeny. Additionally, a series of parallel/convergent amino acid substitutions were identified in mitochondrial OXPHOS genes of TST complex shrimps, which reflect functional convergence or similar genetic mechanisms of cave adaptation. The extensive occurrence of positive selection is suggestive of their essential role in adaptation to hypoxic anchialine environment, and further implying that TST complex shrimps might have acquired a finely capacity for energy metabolism. These results provided some new insights into the genetic basis of anchialine hypoxia adaptation.

참고문헌 (51)

참고문헌 신청

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