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Updated: Jun 19, 2026

Functional Characterization of Carboxylesterases in Insecticide Resistant House Flies, Musca Domestica
Published on: August 23, 2018
Unveiling the Role of Two Rhodopsin-like GPCR Genes in Insecticide-Resistant House Flies, Musca domestica
Juanjuan Xin1, Dylan Brown1, Yifan Wang1
1Department of Entomology and Plant Pathology, Auburn University, Auburn, AL 36849, USA.
Two G-protein-coupled receptor (GPCR) genes were identified as key regulators of insecticide resistance in house flies. Overexpression of these genes enhanced insecticide detoxification by upregulating P450 enzymes, offering new targets for resistance management.
Area of Science:
- Entomology
- Molecular Biology
- Genetics
Background:
- Insecticide resistance poses a significant threat to pest control, often mediated by enhanced metabolic detoxification via P450 enzymes.
- The transcriptional regulation of P450 genes, crucial for insecticide resistance, is not fully understood, though G-protein-coupled receptors (GPCRs) are implicated.
Purpose of the Study:
- To investigate the role of GPCR genes in insecticide resistance in *Musca domestica*.
- To identify specific GPCRs involved in the regulation of P450-mediated insecticide detoxification.
Main Methods:
- Comparative gene expression analysis between resistant and susceptible *Musca domestica* strains.
- Gene mapping to identify the chromosomal location of candidate GPCR genes.
- Functional validation using transgenic *Drosophila melanogaster* to assess the impact of GPCR overexpression on insecticide resistance and P450 gene expression.
Main Results:
- Two rhodopsin-like GPCR genes, *ALHF_02706.g1581* and *ALHF_04422.g2918*, were significantly overexpressed in a resistant *M. domestica* strain.
- Both genes mapped to autosome 2, a region associated with resistance regulatory factors.
- Overexpression of these GPCRs in *Drosophila* conferred approximately two-fold permethrin resistance and modulated the expression of detoxification P450 genes (*CYP12D1*, *CYP6A2*, *CYP6A8*, *CYP6G1*).
Conclusions:
- Rhodopsin-like GPCRs on autosome 2 act as trans-regulatory factors for P450-mediated insecticide resistance in *M. domestica*.
- These GPCRs play a critical role in enhancing insecticide detoxification and contribute to the development of insecticide resistance.
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