CHINESE JOURNAL OF PARASITOLOGY AND PARASITIC DISEASES ›› 2017, Vol. 35 ›› Issue (3): 280-287.

• Original Articles • Previous Articles     Next Articles

Mitochondrial DNA sequence analysis of cytochrome oxidase subunit Ⅰ gene from 28 mosquito species in China

Yu-yan GUO1, Lei LUO2, Zhang-yao SONG1, Xue-li ZHENG1,*()   

  1. 1 Department of Etiobiology, School of Public Health, South Medical University, Guangzhou 510515, China
    2 Department of Disinfection and Pesticide, Guangzhou Center for Disease Control and Prevention, Guangzhou 510440, China
  • Received:2017-02-24 Online:2017-03-30 Published:2017-09-07
  • Contact: Xue-li ZHENG E-mail:mzhengxueli2001@126.com
  • Supported by:
    Supported by the National Natural Science Foundation of China(No. 31630011), Scientific and Technological Projects of Guangdong Province (No. 2013B021800042) and Provincial Natural Science Fund of Guangdong(No. 2015A030313784)

Abstract: Objective To perform mitochondrial DNA sequence analysis of cytochrome oxidase subunit Ⅰ (COⅠ) gene from 28 species of mosquitoes in China and to explore the potential use of COⅠ as a molecular marker to distinguish mosquito species. Methods Mosquito larvae were collected from mosquito breeding grounds in 12 Provinces/Municipalities/Autonomous Regions including Hainan, Guangdong, Guangxi, Yunnan, Fujian, Zhejiang, Henan, Shanxi, Jilin, Heilongjiang, Tianjin and Inner Mongolia, from April 2015 to October 2016, and were grown into mosquitoes. The human trap and light trap methods were used to collect adult mosquitoes. After morphological identification, genomic DNA was extracted individually from the mosquitoes, and the 5′ fragment of mitochondrial COⅠ gene was amplified by PCR using international Diptera primers and sequenced. Alignment of multiple sequences was performed with Clustal 1.83 and MEGA 5.05 softwares. DNAMAN 9.0 software was used to calculate the identity among sequences and Mega 5.05 software was used to analyze sequence characteristics and calculate the genetic distance. The phylogenetic tree was constructed by Neighbor-Joining (NJ) method based on 1-4 sequences randomly selected for each species. Results A total of 301 mosquitoes were collected, belonging to 28 species, six genera, three subfamilies. The 28 species included 5 species of the Aedes genus, 6 species of the Anopheles genus, 14 species of the Culex genus, as well as species of Armigeres subalbatus, Mansonia uniformis, and Toxorhynchites splendens. The amplification of COⅠ gene in the 28 mosquito species produced bands of ~711 bp, but the final length of sequence for analysis after sequence alignment was 651 bp. The COⅠ sequence identity among different species ranged 97.85%-99.97%. The intraspecies and interspecies K2P genetic distances were 0.15%-2.89% and 0.25%-14.5%, respectively. There were 153 mutational sites and 131 parsimony-informative sites in the COⅠ sequence among the 6 species of the Anopheles genus, with average T + A content of 67.7%, and the encoded 217 amino acids had 206 conserved ones (94.9%). The nucleotide homology among the 6 species was 98.31%-99.72%, and intraspecies and interspecies K2P genetic distances were 0.41%-1.56% and 1.07%-14.5%, respectively. Phylogenetic tree constructed on the 60 COⅠ sequences of 28 species showed clustering of Cx. pipiens, Cx. pipiens pallens and Cx. quinquefasciatus, as well as clustering of An. albitarsis and An. vagus. The other 23 species were clustered within each species. Conclusion COⅠ gene may be used as a molecular marker to distinguish between some mosquito species in some regions of China, but it cannot serve to distinguish between closely-related species.

Key words: Mosquito, Mitochondrial DNA cytochrome oxidase subunit Ⅰ, Molecular marker

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