Western Kenyan Anopheles gambiae showing intense permethrin resistance harbour distinct microbiotaOriginal paper
Karen Pendergrass is a microbiome researcher specializing in microbiome-targeted interventions (MBTIs). She systematically analyzes scientific literature to identify microbial patterns, develop hypotheses, and validate interventions. As the founder of the Microbiome Signatures Database, she bridges microbiome research with clinical practice. In 2012, based on her own investigative research, she became the first documented case of FMT for Celiac Disease, four years before the first published case study.
Read MoreWhat was studied?
Researchers compared the bacterial microbiota of permethrin-resistant versus permethrin-susceptible Anopheles gambiae sensu stricto mosquitoes from Tulukuyi village, Bungoma, Kenya. All mosquitoes were F1 progeny of field-caught females.
How was it studied?
133 female mosquitoes were exposed to five times the discriminating dose of permethrin using the CDC bottle bioassay. From the results, 50 resistant and 50 susceptible mosquitoes were screened for kdr East and West mutations and individually sequenced at the 16S rRNA gene to profile bacterial and archaeal taxa.
What did they find?
47 percent of mosquitoes tested were resistant, and 99 percent of the sequenced subset carried the kdr East mutation. Of 84 bacterial taxa detected overall, 20 were unique to resistant mosquitoes and 28 unique to susceptible ones. Bacterial composition differed significantly between the two groups (PERMANOVA pseudo-F = 2.33, P = 0.001), with Sphingobacterium, Lysinibacillus, Streptococcus and Rubrobacter linked to resistant mosquitoes, and Myxococcus linked to susceptible ones.
Why it matters
Sphingobacterium, Lysinibacillus and Streptococcus are known pyrethroid-degrading bacteria, suggesting a microbe-mediated, metabolic mechanism of insecticide resistance in malaria vectors. The findings point toward potential microbial markers for insecticide resistance surveillance.