Selection of insensitive acetylcholinesterase as a resistance mechanism in Aedes aegypti (Diptera: Culicidae) from Santiago de Cuba.
A sample of Aedes aegypti (L.) (Diptera: Culicidae) from Santiago de Cuba, Cuba, with a high level of propoxur resistance compared with the reference susceptible Rockefeller strain (12.60 x at the 50% lethal concentration [LC50] and 18.08 at the 90% lethal concentration [LC90]), with a 4.3% frequency of insensitive acetylcholinesterase (AChE) frequency, was subjected to propoxur selection for 13 successive generations to increase the frequency of this resistance mechanism in Ae. aegypti. High resistance to propoxur was developed during this selection (41.73-fold), and the frequency of insensitive AChE mechanism was increased 13.25-fold. Other mechanisms (overproduced esterases, glutathione transferases, or monooxygenases) were not detected in the propoxur-selected strain. The selection of an insensitive AChE resistance mechanism in Ae. aegypti has important implications and will be a valuable resource for genetic studies and molecular characterization of the ace gene mutation(s) associated with insecticide resistance in Ae. aegypti.
Bisset
Juan
J
Vector Control Department, Institute of Tropical Medicine Pedro Kouri, Autopista Novia del Mediodfa Km 61/2, entre Autopista Nacional y Carretera Central, A. Postal 601, Marianao 13, Ciudad Habana, Cuba.
Rodríguez
María M
MM
Fernández
Ditter
D
D000110:Acetylcholinesterase / Q000378:metabolism*; D000330:Aedes / Q000235:genetics / Q000502:physiology*; D000818:Animals; D003462:Cuba; D007305:Insecticide Resistance / Q000235:genetics / Q000502:physiology*; D001074:Propoxur / Q000378:metabolism* / Q000633:toxicity; D012641:Selection, Genetic
D001074:Propoxur; D000110:Acetylcholinesterase