Related Experiment Video
Updated: Jul 10, 2025
Detecting Wolbachia Strain wAlbB in Aedes albopictus Cell Lines
Published on: June 1, 2022
Detection of Natural Wolbachia Strains in Anopheles Mosquitoes
1School of Life Sciences, University of Warwick, Coventry, UK. thomas.walker.1@warwick.ac.uk.
Abstract:
Wolbachia is an endosymbiotic bacterium that naturally infects many insect species, including mosquitoes that transmit human diseases. Wolbachia strains have been shown to inhibit the transmission of both arboviruses and malaria Plasmodium parasites. The existence of natural strains in wild Anopheles (An.) mosquitoes, the vectors of malaria parasites, in an endosymbiotic relationship is still to be fully determined. Although Wolbachia has been reported to be present in wild populations of the An. gambiae complex, the primary vectors of malaria in Sub-Saharan Africa, Wolbachia DNA sequence density and infection frequencies are low. As most studies have used highly sensitive nested PCR as the only detection method, more robust evidence is required to determine whether Wolbachia strains are established as endosymbionts in Anopheles species. Techniques such as fluorescent in situ hybridization, microbiome sequencing, and Wolbachia whole genome sequencing have provided concrete evidence for genuine Wolbachia strains in two mosquito species: An. moucheti and An. demeilloni. In this chapter, the current methodology used to determine if resident strains exist in Anopheles mosquitoes will be reviewed, including both PCR- and non-PCR-based protocols.
Insights
Wolbachia bacteria naturally infect insects, including disease-carrying mosquitoes. Research confirms established Wolbachia endosymbionts in Anopheles mosquitoes, crucial for malaria control strategies.
Area of Science:
- Microbiology
- Entomology
- Parasitology
Background:
- Wolbachia are endosymbiotic bacteria found in many insects.
- These bacteria can inhibit arboviruses and malaria parasites.
- Their presence in wild Anopheles mosquitoes, the primary malaria vectors, is not fully established.
Purpose of the Study:
- To review current methodologies for detecting Wolbachia in Anopheles mosquitoes.
- To provide robust evidence for established Wolbachia endosymbionts in Anopheles species.
Main Methods:
- Review of PCR-based detection protocols.
- Application of non-PCR methods like fluorescent in situ hybridization, microbiome sequencing, and whole genome sequencing.
- Analysis of Wolbachia DNA sequence density and infection frequencies.
Main Results:
- Previous studies reported low Wolbachia DNA density and infection frequencies in Anopheles gambiae complex.
- Robust evidence confirms genuine Wolbachia strains in Anopheles moucheti and Anopheles demeilloni.
- Fluorescent in situ hybridization, microbiome sequencing, and whole genome sequencing provided concrete evidence.
Conclusions:
- Wolbachia endosymbionts are confirmed in specific Anopheles mosquito species.
- Advanced detection methods are crucial for establishing Wolbachia presence in Anopheles.
- This finding has implications for malaria transmission control.
