Evolutionary divergence of mitochondrial genomes in two Tetranychus species distributed across different climates

作者：Jing‐Tao Sun, Peng‐Yu Jin, Ary A. Hoffmann, Xing‐Zhi Duan, Junjie Dai, Gao Hu, Xiao–Feng Xue, Xiao‐Yue Hong · 发表于：Insect Molecular Biology · 年份：2018 · DOI：10.1111/imb.12501 · 被引用次数：45 · 研究领域：Insect-Plant Interactions and Control、Genomics and Phylogenetic Studies、Evolution and Genetic Dynamics

Abstract There is increasing evidence that mitochondrial genomes (mitogenomes) can be under selection, whereas the selective regimes shaping mitogenome evolution remain largely unclear. To test for mitogenome evolution in relation to the climate adaptation, we explored mtDNA variation in two spider mite ( Tetranychus ) species that distribute across different climates. We sequenced 26 complete mitogenomes of Tetranychus truncates , which occurs in both warm and cold regions, and nine complete mitogenomes of Tetranychus pueraricola , which is restricted to warm regions. Patterns of evolution in the two species’ mitogenomes were compared through a series of d N / d S methods and physicochemical profiles of amino acid replacements. We found that: (1) the mitogenomes of both species were under widespread purifying selection; (2) elevated directional adaptive selection was observed in the T. truncatus mitogenome, perhaps linked to the cold climates adaptation of T. truncatus ; and (3) the strength of selection varied across genes, and diversifying positive selection detected on ND4 and ATP6 pointed to their crucial roles during adaptation to different climatic conditions. This study gained insight into the mitogenome evolution in relation to the climate adaptation.