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anopheles coluzzii

Effects of insemination and blood-feeding on locomotor activity of wild-derived females of the malaria mosquito Anopheles coluzzii

September 8, 2021 - 17:21 -- Open Access
Author(s): 
Traoré AS, Porciani A, Moiroux N, Dabiré RK, Simard F, Costantini C, Mouline K
Reference: 
Parasit Vectors. 2021 Sep 7;14(1):457

Behavioural shifts in the canonical location and timing of biting have been reported in natural populations of anopheline malaria vectors following the implementation of insecticide-based indoor vector control interventions. These modifications increase the likelihood of human-vector contact and allow mosquitoes to avoid insecticides, both conditions being favourable to residual transmission of the malarial parasites. The biting behaviour of mosquitoes follows rhythms that are under the control of biological clocks and environmental conditions, modulated by physiological states. In this work we explore modifications of spontaneous locomotor activity expressed by mosquitoes in different physiological states to highlight phenotypic variability associated to circadian control that may contribute to explain residual transmission in the field.

Neuronal odor coding in the larval sensory cone of Anopheles coluzzii: Complex responses from a simple system

August 25, 2021 - 15:43 -- Open Access
Author(s): 
Sun H, Liu F, Baker AP, Honegger HW, Raiser G, Zwiebel LJ
Reference: 
Cell Rep. 2021 Aug 17;36(7):109555

Anopheles mosquitoes are the sole vectors of malaria. Although adult females are directly responsible for disease transmission and accordingly have been extensively studied, the survival of pre-adult larval stages is vital. Mosquito larvae utilize a spectrum of chemosensory and other cues to navigate their aquatic habitats to avoid predators and search for food.

Ecological plasticity to ions concentration determines genetic response and dominance of Anopheles coluzzii larvae in urban coastal habitats of Central Africa

August 10, 2021 - 17:13 -- Open Access
Author(s): 
Longo-Pendy NM, Tene-Fossog B, Tawedi RE, Akone-Ella O, Toty C, Rahola N, Braun JJ, Berthet N, Kengne P, Costantini C, Ayala D
Reference: 
Sci Rep. 2021 Aug 4;11(1):15781

In Central Africa, the malaria vector Anopheles coluzzii is predominant in urban and coastal habitats. However, little is known about the environmental factors that may be involved in this process. Here, we performed an analysis of 28 physicochemical characteristics of 59 breeding sites across 5 urban and rural sites in coastal areas of Central Africa. We then modelled the relative frequency of An. coluzzii larvae to these physicochemical parameters in order to investigate environmental patterns.

Cuticular hydrocarbons are associated with mating success and insecticide resistance in malaria vectors

July 28, 2021 - 12:55 -- Open Access
Author(s): 
Adams KL, Sawadogo SP, Catteruccia F, et al.
Reference: 
Commun Biol. 2021 Jul 26;4(1):911

Anopheles coluzzii females, important malaria vectors in Africa, mate only once in their lifetime. Mating occurs in aerial swarms with a high male-to-female ratio, where traits underlying male mating success are largely unknown. Here, we investigated whether cuticular hydrocarbons (CHCs) influence mating success in natural mating swarms in Burkina Faso.

NOT Open Access | Larval habitat selection by females of two malaria vectors in response to predation risk

June 23, 2021 - 14:27 -- NOT Open Access
Author(s): 
Sougué E, Dabiré RK, Roux O
Reference: 
Acta Trop. 2021 Jun 19:106016

For species lacking parental care, selection of a suitable habitat for their offspring, with a limited predation risk, is important. The ability of two African malaria mosquito females to detect a predation threat for their larvae was assessed through an oviposition choice test design. Our results suggest that gravid females of both Anopheles gambiae s.s. and An. coluzzii (Diptera, Culicidae) were able to detect the presence of a predator (Anisops jaczewskii, Notonectidae, Hemiptera; backswimmer).

The origin of island populations of the African malaria mosquito, Anopheles coluzzii

June 1, 2021 - 12:19 -- Open Access
Author(s): 
Campos M, Hanemaaijer M, Gripkey H, Collier TC, Lee Y, Cornel AJ, Pinto J, Ayala D, Rompão H, Lanzaro GC
Reference: 
Commun Biol. 2021 May 26;4(1):630

Anopheles coluzzii is a major malaria vector throughout its distribution in west-central Africa. Here we present a whole-genome study of 142 specimens from nine countries in continental Africa and three islands in the Gulf of Guinea. This sample set covers a large part of this species' geographic range. Our population genomic analyses included a description of the structure of mainland populations, island populations, and connectivity between them.

Anopheles coluzzii stearoyl-CoA desaturase is essential for adult female survival and reproduction upon blood feeding

May 25, 2021 - 14:08 -- Open Access
Author(s): 
Ferdous Z, Fuchs S, Behrends V, Trasanidis N, Waterhouse RM, Vlachou D, Christophides GK
Reference: 
PLoS Pathog. 2021 May 20;17(5):e1009486

Vitellogenesis and oocyte maturation require anautogenous female Anopheles mosquitoes to obtain a bloodmeal from a vertebrate host. The bloodmeal is rich in proteins that are readily broken down into amino acids in the midgut lumen and absorbed by the midgut epithelial cells where they are converted into lipids and then transported to other tissues including ovaries.

Transcriptomic analysis reveals pronounced changes in gene expression due to sub-lethal pyrethroid exposure and ageing in insecticide resistance Anopheles coluzzii

May 12, 2021 - 09:15 -- Open Access
Author(s): 
Ingham VA, Brown F, Ranson H
Reference: 
BMC Genomics. 2021 May 10;22(1):337

Malaria control is heavily reliant on the use of insecticides that target and kill the adult female Anopheline vector. The intensive use of insecticides of the pyrethroid class has led to widespread resistance in mosquito populations. The intensity of pyrethroid resistance in some settings in Africa means mosquitoes can contact bednets treated with this insecticide class multiple times with minimal mortality effects. Furthermore, both ageing and diel cycle have been shown to have large impacts on the resistance phenotype. Together, these traits may affect other aspects of vector biology controlling the vectorial capacity or fitness of the mosquito.

NOT Open Access | Ammonium transporter AcAmt mutagenesis uncovers reproductive and physiological defects without impacting olfactory responses to ammonia in the malaria vector mosquito Anopheles coluzzii

May 5, 2021 - 08:24 -- NOT Open Access
Author(s): 
Ye Z, Liu F, Ferguson ST, Baker A, Pitts RJ, Zwiebel LJ
Reference: 
Insect Biochem Mol Biol. 2021 Apr 29:103578

Anopheline mosquitoes are the sole vectors of malaria and rely on olfactory cues for host seeking in which ammonia derived from human sweat plays an essential role. To investigate the function of the Anopheles coluzzii ammonium transporter (AcAmt) in the mosquito olfactory system, we generated an AcAmt null mutant line using CRISPR/Cas9.

Multimodal synergisms in host stimuli drive landing response in malaria mosquitoes

April 6, 2021 - 13:50 -- Open Access
Author(s): 
Carnaghi M, Belmain SR, Hopkins RJ, Hawkes FM
Reference: 
Sci Rep. 2021 Apr 1;11(1):7379

Anopheles mosquitoes transmit malaria, which affects one-fifth of the world population. A comprehensive understanding of mosquito behaviour is essential for the development of novel tools for vector control and surveillance. Despite abundant research on mosquito behaviour, little is known on the stimuli that drive malaria vectors during the landing phase of host-seeking.

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