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Phylogenetic relationships in Demodex mites (Acari: Demodicidae) based on mitochondrial 16S rDNA partial sequences

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Abstract

To confirm phylogenetic relationships in Demodex mites based on mitochondrial 16S rDNA partial sequences, mtDNA 16S partial sequences of ten isolates of three Demodex species from China were amplified, recombined, and sequenced and then analyzed with two Demodex folliculorum isolates from Spain. Lastly, genetic distance was computed, and phylogenetic tree was reconstructed. MEGA 4.0 analysis showed high sequence identity among 16S rDNA partial sequences of three Demodex species, which were 95.85 % in D. folliculorum, 98.53 % in Demodex canis, and 99.71 % in Demodex brevis. The divergence, genetic distance, and transition/transversions of the three Demodex species reached interspecies level, whereas there was no significant difference of the divergence (1.1 %), genetic distance (0.011), and transition/transversions (3/1) of the two geographic D. folliculorum isolates (Spain and China). Phylogenetic trees reveal that the three Demodex species formed three separate branches of one clade, where D. folliculorum and D. canis gathered first, and then gathered with D. brevis. The two Spain and five China D. folliculorum isolates did not form sister clades. In conclusion, 16S mtDNA are suitable for phylogenetic relationship analysis in low taxa (genus or species), but not for intraspecies determination of Demodex. The differentiation among the three Demodex species has reached interspecies level.

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Acknowledgments

This work was supported by the National Natural Science Foundation of China (30872199) and Natural Science Foundation of Shaanxi Province (2006C247), China.

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None declared.

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Authors and Affiliations

  1. Department of Immunology and Pathogen Biology, Xi’an Jiaotong University College of Medicine, No.76 Yanta West Road, Xi’an, China, 710061

    Ya-E Zhao & Li-Ping Wu

  2. Department of Clinical Laboratory, Chengdu First People’s Hospital, Chengdu, 610041, China

    Li-Ping Wu

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  1. Ya-E Zhao
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  2. Li-Ping Wu
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Correspondence to Ya-E Zhao.

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Zhao, YE., Wu, LP. Phylogenetic relationships in Demodex mites (Acari: Demodicidae) based on mitochondrial 16S rDNA partial sequences. Parasitol Res 111, 1113–1121 (2012). https://doi.org/10.1007/s00436-012-2941-7

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  • DOI: https://doi.org/10.1007/s00436-012-2941-7

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