P-glycoprotein-like protein, a possible genetic marker for ivermectin resistance selection in Onchocerca volvulus

Molecular and Biochemical Parasitology
C BourguinatRoger K Prichard

Abstract

Ivermectin (IVM) is the only safe drug for mass-treatment of onchocerciasis. IVM resistance has been reported in gastrointestinal nematode parasites of animals. A reduction in response to IVM in Onchocerca volvulus could have significant consequences for the onchocerciasis control programs. We have found evidence that, in O. volvulus, repeated IVM treatment selects for specific alleles, of P-glycoprotein-like protein (PLP), a half-sized ABC transporter. In this study, O. volvulus samples were derived from a clinical trial in Cameroon, in which patients were sampled before, and following 3 years (1994-1997) of IVM treatments. There were four treatment groups: 150 microg/kg (1 x p.a. or 4 x p.a.) and 800 microg/kg (1 x p.a. or 4 x p.a.). DNA of O. volvulus macrofilariae was genotyped over a 476bp region of the PLP gene and at two control genes. Of the six polymorphic positions found in the PLP amplicon, three of them showed significant selection after 4 x p.a. treatment with IVM (total of 13 IVM treatments) in female worms, and one of the same single nucleotide polymorphisms (SNPs) showed significant selection in the male worms. One of the selected SNPs in the female worms caused an amino acid coding change in the putative protei...Continue Reading

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