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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
A polymerase chain reaction (PCR)-based rapid screening procedure was developed to test individual horn flies, Haematobia irritans irritans (L.), for the presence of a specific nucleotide substitution in the sodium channel gene sequence that has been associated with pyrethroid resistance. By a systematic optimization of reaction conditions and judicious choice of PCR primers differing in DNA sequence by a single nucleotide, we identified pyrethroid-susceptible or resistant sodium channel alleles in individual flies. Laboratory and field populations were examined by both the PCR assay and conventional filter paper bioassays with the pyrethroid cyhalothrin to verify that populations containing greater proportions of individuals with the resistant sodium channel allele DNA sequence also had higher bioassay LC50 values. The PCR assay for resistance alleles gave definitive information on the genotype of an individual fly and detected the presence of heterozygous individuals that might serve as reservoirs of resistance genes in field populations.[1]
