Insecticide resistance in Culex pipiens quinquefasciatus and Aedes albopictus mosquitoes from La Réunion Island

Resistance to insecticides was monitored on Culex pipiens quinquefasciatus mosquitoes collected in twelve localities of La Réunion, a geographically isolated island of the Indian Ocean. This mosquito is of medical concern in the region as a known vector for filariasis and a potential vector for West...

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Published in:	Insect biochemistry and molecular biology Vol. 40; no. 4; pp. 317 - 324
Main Authors:	Tantely, Michaël Luciano, Tortosa, Pablo, Alout, Haoues, Berticat, Claire, Berthomieu, Arnaud, Rutee, Abdoul, Dehecq, Jean-Sébastien, Makoundou, Patrick, Labbé, Pierrick, Pasteur, Nicole, Weill, Mylène
Format:	Journal Article
Language:	English
Published:	England Elsevier Ltd 01-04-2010 Elsevier
Subjects:	Acetylcholinesterase - genetics Aedes - genetics Aedes albopictus Alleles Animals Base Sequence Culex - genetics Culex pipiens quinquefasciatus Dieldrin Dieldrin resistance Female Gene Frequency Genes, Insect Insecticide resistance Insecticide Resistance - genetics Insecticides Life Sciences Male Molecular Sequence Data Organophosphates Pyrethrins Receptors, GABA - genetics Reunion Sequence Alignment Vector control Reunion ISW, Indian Ocean, Mascarene Is., Reunion Culex pipiens quinquefasciatus Aedes albopictus Insecticide resistance Vector control Dieldrin resistance Reunion Phosphoric Acid Esters Pyrethrins Insecticide Resistance Gene Frequency Genes Dieldrin Molecular Sequence Data Insecticides Male Culex Acetylcholinesterase Receptors Sequence Alignment Animals Base Sequence Alleles GABA Female AEDES Insect
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Summary:	Resistance to insecticides was monitored on Culex pipiens quinquefasciatus mosquitoes collected in twelve localities of La Réunion, a geographically isolated island of the Indian Ocean. This mosquito is of medical concern in the region as a known vector for filariasis and a potential vector for West Nile and Rift Valley Fever viruses. Our bioassays indicated the presence of resistance to all tested insecticides, i.e. organochlorides, organophosphates and pyrethroids. A molecular investigation revealed a higher frequency of resistance genes in the coastal areas compared to elevated rural sites, probably reflecting the different nature of insecticide pressures together with the genetic cost of resistance alleles. A simple molecular test was developed to detect Rdl R allele, encoding a γ-aminobutyric acid (GABA) receptor resistant to dieldrin. Unexpectedly high Rdl R frequencies were recorded over the whole island, despite this insecticide having been banned for over 15 years. This resistant allele was also detected for the first time in two samples of Aedes albopictus, a species recently involved in severe Chikungunya epidemics on the island. Rdl R selection in these two mosquito species discloses current insecticide pressures in urban areas, from unknown origins, that should be taken into account to develop vector control strategies.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	0965-1748 1879-0240
DOI:	10.1016/j.ibmb.2010.02.005