PMID: 11903631Mar 21, 2002Paper

Overproduction of a P450 that metabolizes diazinon is linked to a loss-of-function in the chromosome 2 ali-esterase (MdalphaE7) gene in resistant house flies

Insect Molecular Biology
C SabouraultR Feyereisen

Abstract

Up-regulation of detoxifying enzymes in insecticide-resistant strains of the house fly is a common mechanism for metabolic resistance. However, the molecular basis of this increased insecticide metabolism is not well understood. In the multiresistant Rutgers strain, several cytochromes P450 and glutathione S-transferases are constitutively overexpressed at the transcriptional level. Overexpression is the result of trans-regulation, and a regulatory gene has been located on chromosome 2. A Gly137 to Asp point mutation in alphaE7 esterase gene, leading to the loss of carboxylesterase activity, has been associated with organophosphate resistance in the house fly and the sheep blowfly. We show here that purified recombinant CYP6A1 is able to detoxify diazinon with a high efficiency. We also show that either the Gly137 to Asp point mutation in alphaE7 esterase gene or a deletion at this locus confer resistance and overproduction of the CYP6A1 protein. Based on these findings, we propose it is the absence of the wild-type Gly137 allele of the alphaE7 gene that releases the transcriptional repression of genes coding for detoxification enzymes such as CYP6A1, thereby leading to metabolic resistance to diazinon.

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Citations

Aug 14, 2003·Insect Biochemistry and Molecular Biology·Thibaud MartinDidier Fournier
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