Publications scientifiques
Paulette Ndjeunia-Mbiakop
Autres affiliations : Organisation de Coordination pour la lutte contre les Endémies en Afrique Centrale
Abdou Talipouo
Autres affiliations : Organisation de Coordination pour la lutte contre les Endémies en Afrique Centrale
Idriss Nasser Ngangue-Siewe
Autres affiliations : Organisation de Coordination pour la lutte contre les Endémies en Afrique Centrale
Jean Arthur Mbida-Mbida
Nelly Armanda Kala-Chouakeu
Autres affiliations : Organisation de Coordination pour la lutte contre les Endémies en Afrique Centrale
Roland Bamou
Autres affiliations : Organisation de Coordination pour la lutte contre les Endémies en Afrique Centrale
Landre Djamouko-Djonkam
Autres affiliations : Organisation de Coordination pour la lutte contre les Endémies en Afrique Centrale
Timoléon Tchuinkam
John Vontas
Autres affiliations : Foundation for Research and Technology Hellas
Konstantinos Mavridis
Christophe Antonio‐Nkondjio* (Auteur correspondant)
Autres affiliations : Organisation de Coordination pour la lutte contre les Endémies en Afrique Centrale
Pathogens
The spread of pyrethroid resistance in malaria vectors is a major threat affecting the performance of current control measures. However, there is still not enough information on the resistance profile of mosquitoes to carbamates and organophosphates which could be used as alternatives. The present study assessed the resistance profile of Anopheles gambiae s.l. to bendiocarb and malathion, at the phenotypic and molecular levels, in different eco-epidemiological settings in Cameroon. Anopheles gambiae s.l. mosquitoes were collected from four eco-epidemiological settings across the country and their susceptibility level to bendiocarb and malathion was determined using WHO tubes bioassays. The ace-1 target site G119S mutation was screened by PCR. Reverse Transcription quantitative PCR 3-plex TaqMan assays were used to quantify the level of expression of eight genes associated with metabolic resistance. Resistance to malathion and/or bendiocarb was recorded in all study sites except in mosquitoes collected in Kaélé and Njombé. The Ace-1 (G119S) mutation was detected in high frequencies (>40%) in Kékem and Santchou. Both An. gambiae and An. coluzzii were detected carrying this mutation. The cytochrome P450s gene Cyp6p3 associated with carbamate resistance and the glutathione S-transferase gene Gste2 associated with organophosphate resistance were found to be overexpressed. Genes associated with pyrethroid (Cyp6m2, Cyp9k1, Cyp6p3) and organochlorine (Gste2, Cyp6z1, Cyp6m2) and cuticle resistance (Cyp4g16) were also overexpressed. The rapid spread of resistance to organophosphates and carbamates could seriously compromise future control strategies based on IRS. It is therefore becoming important to assess the magnitude of bendiocarb and malathion resistance countrywide.
