Since the past 2 decades, an increasing number of resistance to the Benzimidazoles (BZs) have been reported in nematode parasites of livestock. More recently, detection of single-nucleotide polymorphisms (SNPs) at codons of 167, 198 or 200 of the β-tubulin gene has been attributed to the occurrence of resistance. In the present study, we investigated the presence of those SNPs in the β-tubulin isotype-1 gene in different isolates of in horse. Also, the mitochondrial (mt) and ribosomal genes were sequenced for species confirmation of the isolates. The analysis of sequences inferred from COII gene confirmed that those isolates were . The distance between mt genes obtained here and several ascarid species in equids and other hosts suggests the need for the combination of more genetic data with morphologic and other diagnostic measures. The analysis on β-tubulin isotype-1 gene revealed no resistance-related SNPs or substitutions at the expected codon positions and selection pressure with BZs has not occurred for worms. Although the molecular data showed the susceptibility of isolates against BZs, other mechanisms of resistance should be also investigated to confirm the validity of molecular results.
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| http://dx.doi.org/10.1007/s12639-019-01146-y | DOI Listing |
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