World-wide survey of an Accord insertion and its association with DDT resistance in Drosophila melanogaster.
Previous work showed that insecticide resistance in Drosophila melanogaster is correlated with the insertion of an Accord-like element into the 5' region of the cytochrome P450 gene, Cyp6g1. Here, we study the distribution of the Accord-like element in 673 recently collected D. melanogaster lines from 34 world-wide populations. We also examine the extent of microsatellite variability along a 180-kilobase (kb) genomic region of chromosome II encompassing the resistance gene. We confirm a 100% correlation of the Accord insertion with insecticide resistance and a significant reduction in variability extending at least 20 kb downstream of the Cyp6g1 gene. The frequency of the Accord insertion differs significantly between East African (32-55%) and nonAfrican (85-100%) populations. This pattern is consistent with a selective sweep driving the Accord insertion close to fixation in nonAfrican populations as a result of the insecticide resistance phenotype it confers. This study confirms that hitchhiking mapping can be used to identify beneficial mutations in natural populations.
Catania
F
F
Institut für Tierzucht und Genetik, University of Wien, Josef Baumann Gasse 1, 1210 Wien, Austria.
Kauer
M O
MO
Daborn
P J
PJ
Yen
J L
JL
Ffrench-Constant
R H
RH
Schlotterer
C
C
D000704:Analysis of Variance; D000818:Animals; D003577:Cytochrome P-450 Enzyme System / Q000235:genetics*; D003634:DDT / Q000506:poisoning*; D017931:DNA Primers; D004251:DNA Transposable Elements / Q000235:genetics*; D029721:Drosophila Proteins / Q000235:genetics*; D004331:Drosophila melanogaster / Q000187:drug effects / Q000235:genetics*; D004351:Drug Resistance / Q000235:genetics*; D004587:Electrophoresis, Agar Gel; D005787:Gene Frequency; D006580:Genetic Carrier Screening; D014644:Genetic Variation; D018895:Microsatellite Repeats / Q000235:genetics; D009154:Mutation / Q000235:genetics; D016133:Polymerase Chain Reaction; D012641:Selection, Genetic
D017931:DNA Primers; D004251:DNA Transposable Elements; D029721:Drosophila Proteins; D003577:Cytochrome P-450 Enzyme System; D003634:DDT; C446928:Cyp6g1 protein, Drosophila