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

被引:82
作者
Brandt, A
Scharf, M
Pedra, JHF
Holmes, G
Dean, A
Kreitman, M
Pittendrigh, BR
机构
[1] Purdue Univ, Dept Entomol, W Lafayette, IN 47907 USA
[2] Purdue Univ, MPRINT, W Lafayette, IN 47907 USA
[3] Univ Chicago, Dept Ecol & Evolut, Chicago, IL 60637 USA
关键词
cytochrome; P450; Drosophila; melanogaster; induction; CYP6G1; CYP12D1; pesticide; resistance; insecticide;
D O I
10.1046/j.1365-2583.2002.00344.x
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
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: (1) 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 greater than or equal to6-fold above constitutive resistant fly baselines).
引用
收藏
页码:337 / 341
页数:5
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