First identification of the benzimidazole resistance-associated F200Y SNP in the beta-tubulin gene in Ascaris lumbricoides

Autoři: Luis Fernando Viana Furtado aff001;  Celi da Silva Medeiros aff001;  Luciana Werneck Zuccherato aff001;  William Pereira Alves aff001;  Valéria Nayara Gomes Mendes de Oliveira aff001;  Vivian Jordania da Silva aff001;  Guilherme Silva Miranda aff001;  Ricardo Toshio Fujiwara aff001;  Élida Mara Leite Rabelo aff001
Působiště autorů: Departamento de Parasitologia, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil aff001
Vyšlo v časopise: PLoS ONE 14(10)
Kategorie: Research Article
doi: 10.1371/journal.pone.0224108


The main control strategy for Ascaris lumbricoides is mass drug administration (especially with benzimidazoles), which can select strains of parasites resistant to treatment. Mutations in the beta-tubulin isotype-1 gene at codons 167, 198 and 200 have been linked to benzimidazole resistance in several nematodes. The mutation in codon 200 is the most frequent in different species of parasites, as previously observed in Necator americanus and Trichuris trichiura; however, this mutation has never been found in populations of A. lumbricoides. This study aimed to screen for single nucleotide polymorphisms (SNPs) in the beta-tubulin isotype-1 gene at codon 200 in A. lumbricoides. We developed a technique based on an amplification refractory mutation system (ARMS-PCR) for the analysis of 854 single A. lumbricoides eggs collected from 68 human stool samples from seven Brazilian states. We detected the mutation in codon 200 at a frequency of 0.5% (4/854). This is the first report of this mutation in A. lumbricoides. Although the observed frequency is low, its presence indicates that these parasite populations have the potential to develop high levels of resistance in the future. The methodology proposed here provides a powerful tool to screen for the emergence of anthelmintic resistance mutations in parasitic nematode populations.

Klíčová slova:

Helminths – Mutation detection – Polymerase chain reaction – Ascaris lumbricoides – Amplification-refractory mutation system analysis – Benzimidazoles – Genetic annealing – Veterinary parasitology


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2019 Číslo 10