Population Genetics of Benzimidazole-resistant Haemonchus Contortus and Haemonchus Placei from Buffalo and Cattle: Implications for the Emergence and Spread of Resistance Mutations

Overview

Journal Parasitol Res

Specialty Parasitology

Date 2018 Aug 26

PMID 30143871

Citations 5

Authors

Qasim Ali

Imran Rashid

Muhammad Zubair Shabbir

Kashif Shahzad

Kamran Ashraf

Neil D Sargison

Umer Chaudhry

Affiliations

Soon will be listed here.

Abstract

The population genetics of nematode parasites are poorly understood with practical reference to the selection and spread of anthelmintic resistance mutations. Haemonchus species are important to study the nematode population genetics due to their clinical importance in ruminant livestock, and the availability of genomic resources. In the present study, it has been examined that Haemonchus contortus and Haemonchus placei populations from three buffalo and nine cattle hosts. Seventy-three individual adult worms of H. contortus and 148 of H. placei were analysed using a panel of seven microsatellite markers. The number of alleles per locus in H. contortus and H. placei indicated that all populations were polymorphic for the microsatellites used in the present study. Genetic diversity parameters included high levels of allelic richness and heterozygosity, indicating effective population sizes, high mutation rates and high transmission frequencies in the area. Genetic structure parameters revealed low genetic differentiation between and high levels of genetic variation within H. contortus and H. placei populations. Population dynamic analyses showed an absence of heterozygosity excess in both species, suggesting that there was no deviation from genetic drift equilibrium. Our results provide a proof of concept for better understanding of the consequences of specific control strategies, climatic change or management strategies on the population genetics of anthelmintic resistance alleles in Haemonchus spp. infecting co-managed buffalo and cattle.

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