GEPHE SUMMARY
Gephebase Gene
Entry Status
Published
GepheID
GP00001820
Main curator
Courtier
PHENOTYPIC CHANGE
Trait Category
Trait State in Taxon A
sensitive
Trait State in Taxon B
resistant
Ancestral State
Taxon A
Taxonomic Status
Taxon A
Common Name
barber pole worm
Synonyms
barber pole worm; red stomach worm; Haemonchus contortus (Rudolphi, 1803)
Rank
species
Lineage
cellular organisms; Eukaryota; Opisthokonta; Metazoa; Eumetazoa; Bilateria; Protostomia; Ecdysozoa; Nematoda; Chromadorea; Strongylida; Trichostrongyloidea; Haemonchidae; Haemonchus
NCBI Taxonomy ID
is Taxon A an Infraspecies?
No
Taxon B
Common Name
barber pole worm
Synonyms
barber pole worm; red stomach worm; Haemonchus contortus (Rudolphi, 1803)
Rank
species
Lineage
cellular organisms; Eukaryota; Opisthokonta; Metazoa; Eumetazoa; Bilateria; Protostomia; Ecdysozoa; Nematoda; Chromadorea; Strongylida; Trichostrongyloidea; Haemonchidae; Haemonchus
NCBI Taxonomy ID
is Taxon B an Infraspecies?
No
GENOTYPIC CHANGE
Presumptive Null
No
Molecular Type
Aberration Type
SNP
SNP Coding Change
Nonsynonymous
Molecular Details of the Mutation
Glu198Ala
Experimental Evidence
Taxon A Taxon B Position
Codon - - -
Amino-acid Glu Ala 198
Authors
Ghisi M; Kaminsky R; Mäser P
Abstract
In order to monitor and eventually control the spread of drug-resistant Haemonchus contortus, knowledge of the molecular mechanisms underlying resistance is essential. Here we phenotypically and genotypically characterize three multidrug-resistant H. contortus field isolates from Australia and South Africa. All were significantly less susceptible to thiabendazole than a sensitive reference strain in an in vitro egg-hatch assay. The sensitivity was further reduced in a surviving population after treatment of infected sheep with albendazole. The beta-tubulin genes were amplified from genomic DNA of the H. contortus isolates, cloned, and sequenced. There was a high degree of sequence variation. The known mutation phenylalanine-200 to tyrosine (F200Y) occurred in 60% of the sequences from resistant isolates, but not in the sensitive reference. Interestingly, 90% of the beta-tubulin sequences from resistant isolates lacking tyrosine-200 carried another mutation nearby, glutamate-198 to alanine (E198A). This mutation was not found in the sensitive isolate, nor in sequences from resistant isolates carrying the mutation F200Y. However, the mutation E198A is known from benomyl-resistant isolates of phytopathogenic fungi such as Monilinia fructicola. The finding that alanine-198 correlates with thiabendazole resistance in H. contortus isolates from South Africa and Australia suggests that also in nematodes, the mutation E198A plays a role in benzimidazole resistance. Alanine-198 alleles of beta-tubulin can be detected by PCR-RFLP and we suggest to include this test in future surveys of H. contortus field populations.
Additional References
RELATED GEPHE
Related Genes
No matches found.
Related Haplotypes
2
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