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Discrimination between Demodex folliculorum(Acari:Demodicidae) isolates from China and Spain based on mitochondrial cox1 sequences

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2013年第9期14卷 829-836页

作者： Ya-e ZHAO Jun-xian MA Li HU Li-ping WU Manuel DE ROJAS Department of Immunology and Pathogen Biology Xi'an Jiaotong University College of Medicine Department of Microbiology and Parasitology Faculty of PharmacyUniversity of Sevilla

For a long time,classification of Demodex mites has been based mainly on their hosts and phenotypic characteristics.A new subspecies of Demodex folliculorum has been proposed,but not ***,cox1 partial sequences of nine isolates of three Demodex species from two geographical sources(China and Spain) were studied to conduct molecular identification of *** showed that the mitochondrial cox1 fragments of five *** isolates from the facial skin of Chinese individuals were 429 bp long and that their sequence identity was 97.4%.The average sequence divergence was 1.24% among the five Chinese isolates,0.94% between the two geographical isolate groups(China(5) and Spain(1)),and 2.15% between the two facial tissue sources(facial skin(6) and eyelids(1)).The genetic distance and rate of third-position nucleotide transition/transversion were 0.0125,2.7(3/1) among the five Chinese isolates,0.0094,3.1(3/1) between the two geographical isolate groups,and 0.0217,4.4(3/1) between the two facial tissue *** trees showed that *** from the two geographical isolate groups did not form sister clades,while those from different facial tissue sources *** to the molecular characteristics,it appears that subspecies differentiation might not have occurred and that *** isolates from the two geographical sources are of the same ***,population differentiation might be occurring between isolates from facial skin and eyelids.

关键词： Demodex folliculorum cox1 partial sequences Divergence Genetic relationship Phylogenetic tree

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