title: Population genetic structure of Gasterophilus pecorum in the Kalamaili Nature Reserve, Xinjiang, based on mitochondrial cytochrome oxidase (COI) gene sequence.
abstract: Gasterophilosis is a significant threat to equids in the desert steppe of Xinjiang, China, where Gasterophilus pecorum (Fabricius) (Diptera: Gasterophilidae) is the dominant botfly species. A population analysis was conducted on 195 individual G. pecorum larvae from three host species, Przewalski's horse, the domestic horse and the Asiatic wild ass. The distribution of haplotypes of the maternally inherited mitochondrial cytochrome oxidase subunit I (COI) gene was analysed to assess the population differentiation of G. pecorum. High haplotype diversity was observed among G. pecorum populations from all host species, indicating that the G. pecorum infecting one host had multiple maternal ancestors. A phylogenetic tree showed six clades, suggesting a high degree of genetic differentiation. A constructed haplotype network described both the origin of the haplotypes and the population structure. The findings indicated that G. pecorum infections within Przewalski's horses were mainly transmitted from Asiatic wild asses. Clade 1 was found to be the most primitive group and to have evolved to be highly adaptable to the desert steppe. Clade 2 originated from Clade 1, potentially as a result of the annual migration of domestic horses. Revealing the differentiation of the G. pecorum population is important for elucidating the aetiology of Gasterophilus infection in Xinjiang and for planning appropriate control measures.
authors.affiliation: Key Laboratory of Non-Invasive Research Technology for Endangered Species, College of Nature Conservation, Beijing Forestry University, Beijing, China.
authors.forename: W
authors.initials: W
authors.lastname: Wang
authors.forename: D
authors.initials: D
authors.lastname: Zhang
authors.forename: D
authors.initials: D
authors.lastname: Hu
authors.forename: H
authors.initials: H
authors.lastname: Chu
authors.forename: J
authors.initials: J
authors.lastname: Cao
authors.forename: M
authors.initials: M
authors.lastname: Ente
authors.forename: G
authors.initials: G
authors.lastname: Jiang
authors.forename: K
authors.initials: K
authors.lastname: Li
mesh_terms: D000818:Animals; D002681:China; D003247:Conservation of Natural Resources; D004175:Diptera / Q000235:genetics* / Q000254:growth & development / Q000502:physiology; D003576:Electron Transport Complex IV / Q000235:genetics*; D018397:Equidae; D006239:Haplotypes; D006734:Horse Diseases / Q000469:parasitology*; D006736:Horses; D019476:Insect Proteins / Q000235:genetics; D007303:Insect Vectors / Q000235:genetics* / Q000254:growth & development / Q000502:physiology; D007411:Intestinal Diseases, Parasitic / Q000469:parasitology / Q000662:veterinary*; D007814:Larva / Q000235:genetics / Q000502:physiology; D024101:Mitochondrial Proteins / Q000235:genetics; D009198:Myiasis / Q000469:parasitology / Q000662:veterinary*; D010802:Phylogeny; D013045:Species Specificity
chemical_list: D019476:Insect Proteins; D024101:Mitochondrial Proteins; D003576:Electron Transport Complex IV
keywords: COI; Gasterophilus pecorum; equids; population genetic structure