Present address: Department of Entomology, New York State Agricultural Experiment Station, Cornell University, Geneva, NY 14456, USA.
Expression and induction of three family 4 cytochrome P450 (CYP4) genes identified from insecticide-resistant and susceptible western corn rootworms, Diabrotica virgifera virgifera*
Article first published online: 20 DEC 2001
Insect Molecular Biology
Volume 10, Issue 2, pages 139–146, April 2001
How to Cite
Scharf, M. E., Parimi, S., Meinke, L. J., Chandler, L. D. and Siegfried, B. D. (2001), Expression and induction of three family 4 cytochrome P450 (CYP4) genes identified from insecticide-resistant and susceptible western corn rootworms, Diabrotica virgifera virgifera. Insect Molecular Biology, 10: 139–146. doi: 10.1046/j.1365-2583.2001.00248.x
Sequences are deposited in GenBank under the accession numbers AF243506, AF243507 and AF257100.
- Issue published online: 20 DEC 2001
- Article first published online: 20 DEC 2001
- Received 27 July 2000; accepted after revision 7 November 2000.
- cytochrome P450;
- insecticide resistance;
We have previously determined that cytochrome P450-based oxidation is involved in resistance to the insecticides methyl parathion and carbaryl in geographically distinct Nebraska western corn rootworm populations. Three new family 4 cytochrome P450 (CYP4) gene fragments (CYP4AJ1, CYP4G18 and CYP4AK1) were cloned and sequenced from insecticide-resistant and -susceptible western corn rootworms. Insecticide bioassays indicated the resistant population employed in this study was significantly resistant to the insecticides methyl parathion and carbaryl. CYP4AJ1 and CYP4G18 were cloned from both genomic PCR and RT-PCR products, although only CYP4AJ1 contains an intronic region. Alignments of inferred amino acid sequences with other homologous insect CYP4 genes indicates a high degree of similarity. Northern analysis concurrently employing mixed probes representing each of the three rootworm CYP4 fragments identified increased mRNA transcript signals (i) in resistant rootworms and (ii) following induction by the P450 inducer pentamethyl benzene. These results support our previous documentation of P450-based insecticide resistance and suggest increased CYP4 transcript abundance can serve as a molecular resistance-associated marker.