Differential expression and induction of two Drosophila cytochrome P450 genes near the Rst(2)DDTlocus

A. Brandt, M. Scharf, J. H.F. Pedra, G. Holmes, A. Dean, M. Kreitman, B. R. Pittendrigh

Research output: Contribution to journalArticlepeer-review


Previous studies have shown that the major metabolic resistance locus in the insecticide-resistant Drosophila line Rst(2)DDTWisconsin maps between the markers cn and vg on chromosome 2. Six cytochrome P450 genes exist in this region. We investigated the expression levels of these P450 genes in DDT-resistant and -susceptible fly lines. We report: (i) DDT resistance is significant (> 30-fold) and dominant, (ii) resistance is reduced by the cytochrome P450 inhibitor PBO, (iii) there is constitutive over-expression relative to susceptible flies of two genes encoding cytochrome P450 enzymes within the cn-vg region (CYP6G1 = 4.3-fold; CYP12D1 = 6.0-fold), and (iv) exposure to DDT results in an increased expression of only one of these two P450 genes (CYP12D1 ≥ 6-fold above constitutive resistant fly baselines).

Original languageEnglish (US)
Pages (from-to)337-341
Number of pages5
JournalInsect Molecular Biology
Issue number4
StatePublished - 2002


  • CYP12D1
  • CYP6G1
  • Cytochrome
  • Drosophila
  • Induction
  • Insecticide
  • Melanogaster
  • P450
  • Pesticide
  • Resistance

ASJC Scopus subject areas

  • Molecular Biology
  • Genetics
  • Insect Science


Dive into the research topics of 'Differential expression and induction of two Drosophila cytochrome P450 genes near the Rst(2)DDTlocus'. Together they form a unique fingerprint.

Cite this