首页|Novel evolutionary insights into nemacheilid cavefish:evidence from comparative analysis of mitochondrial genomes
Novel evolutionary insights into nemacheilid cavefish:evidence from comparative analysis of mitochondrial genomes
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国家科技期刊平台
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Cavefish can be important models for understanding the relationships among evolution,adaptation,and development in extreme environments.However,cavefish remain poorly studied,particularly at the genome level.Here,we sequenced the complete mitogenome of three cavefish in the family Nemacheilidae(Paranemachilus pingguoensis,Oreonectes polystigmus,and Heminoemacheilus longibarbatus),which were collected from karst caves in South China.The mitogenomes each contained 37 genes(13 protein coding,22 tRNA,and two rRNA genes)and a single control region,with the same genetic arrangement and distribution as those found in vertebrates.The non-synonymous/synonymous mutation ratios(Ka/Ks)of the mitogenomes indicated that the protein-coding genes(PCGs)of the three cavefish evolved under purifying selection.The mitogenomes of the three cavefish exhibit nucleotide composition biases for PCGs,tRNAs,rRNAs,and the whole genome,indicating that the mitochondrial DNA might have been subjected to evolutionary selection in response to extreme cave environments.Divergence time and evolutionary history analyses suggested that the speciation and diversification of the cavefish coincided with the Miocene uplift of the southern Qinghai-Tibet Plateau,which greatly changed cave habitats.Overall,our study sheds light on the mitogenomes,phylogeny,and evolutionary history of nemacheilid cavefish.
Lei ZHOU、Shihui HUANG、Qing WANG、Zhenhai LI、Zongyang LI、Anyou HE、Jiehu CHEN、Li LIU、Keshu ZOU
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Joint Laboratory of Guangdong Province and Hong Kong Region on Marine Bioresource Conservation and Exploitation,College of Marine Sciences,South China Agricultural University,Guangzhou 510642,China
Guangxi Key Laboratory of Aquatic Genetic Breeding and Healthy Aquaculture,Guangxi Academy of Fishery Sciences,Nanning 530021,China
Science Corporation of Gene,Guangzhou 510000,China
Open Fund of Guangxi Key Laboratory of Aquatic Genetic Breeding and Healthy AquacultureNational Natural Science Foundation of ChinaChina-ASEAN Maritime Cooperation Fund
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