title: Recombination between two amplified esterase alleles in Culex pipiens.
abstract: Esterase gene amplification at the Ester superlocus provides organophosphate resistance in the mosquito Culex pipiens (L.). In this study we explored the possibility of recombination between two amplified esterase alleles, thus generating a composite amplified allele. To do that, females heterozygous for two distinct amplified alleles (Ester(2) and Ester(4)) were crossed with males homozygous for a third resistance allele (Ester(8)). Among analyzed offspring, one recombinant composite allele (Ester(2-4)) was detected, providing a rate of recombination of approximately 0.2%. This is the first report of a recombination between two distinct amplified esterase alleles. This phenomenon renders the predictability of allele evolution considerably more complex than was previously thought.
authors.affiliation: Team Genetics of Adaptation, Laboratoire Génétique et Environnement, Institut des Sciences de l'Evolution (UMR CNRS 5554), Université de Montpellier II (C.C. 065), F-34095 Montpellier cedex 05, France. berticat@isem.univ-montp2.fr
authors.forename: C
authors.initials: C
authors.lastname: Berticat
authors.forename: M
authors.initials: M
authors.lastname: Marquine
authors.forename: M
authors.initials: M
authors.lastname: Raymond
authors.forename: C
authors.initials: C
authors.lastname: Chevillon
mesh_terms: D000818:Animals; D003433:Crosses, Genetic; D003465:Culex / Q000201:enzymology / Q000235:genetics*; D004950:Esterases / Q000235:genetics*; D005260:Female; D005784:Gene Amplification; D017344:Genes, Insect; D008297:Male; D010641:Phenotype; D011995:Recombination, Genetic
chemical_list: D004950:Esterases