Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
2009638 | Pesticide Biochemistry and Physiology | 2010 | 5 Pages |
Abstract
We found the A2â²N mutation (index number for M2 membrane spanning region) in the GABA receptor subunit of fipronil-resistant Sogatella furcifera, by analyzing DNA sequences amplified from fipronil-resistant and -susceptible S. furcifera. In order to confirm the role of A2â²N mutation in the fipronil resistance, we expressed the wild-type and A2â²N mutant Drosophila GABA receptors in Drosophila Mel-2 cells stably. Amino acid sequences of three membrane spanning regions (M1-M3), which are important for binding of fipronil, are conserved between Drosophila and S. furcifera. So the results of A2â²N mutant Drosophila GABA receptor suggest the role of A2â²N mutation in fipronil-resistant S. furcifera. The membrane potential assay showed that the A2â²N mutant Drosophila GABA receptor was not inhibited by fipronil at all, while the IC50 value of fipronil for wild-type Drosophila GABA receptor was 172Â nM. These results suggest that A2â²N mutation confers the resistance of fipronil in S. furcifera.
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Authors
Toshifumi Nakao, Atsuko Naoi, Nobuyuki Kawahara, Kangetsu Hirase,