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Mugenzi, LMJ, Tekoh, TA, Ntadoun, ST, Chi, AD, Gadji, M, Menze, BD, Tchouakui, M, Irving, H, Wondji, MJ, Weedall, GD, Hearn, J and Wondji, CS (2024) Association of a rapidly selected 4.3kb transposon-containing structural variation with a P450-based resistance to pyrethroids in the African malaria vector Anopheles funestus. PLoS Genetics, 20 (7). ISSN 1553-7390
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Abstract
Deciphering the evolutionary forces controlling insecticide resistance in malaria vectors remains a prerequisite to designing molecular tools to detect and assess resistance impact on control tools. Here, we demonstrate that a 4.3kb transposon-containing structural variation is associated with pyrethroid resistance in central/eastern African populations of the malaria vector Anopheles funestus. In this study, we analysed Pooled template sequencing data and direct sequencing to identify an insertion of 4.3kb containing a putative retro-transposon in the intergenic region of two P450s CYP6P5-CYP6P9b in mosquitoes of the malaria vector Anopheles funestus from Uganda. We then designed a PCR assay to track its spread temporally and regionally and decipher its role in insecticide resistance. The insertion originates in or near Uganda in East Africa, where it is fixed and has spread to high frequencies in the Central African nation of Cameroon but is still at low frequency in West Africa and absent in Southern Africa. A marked and rapid selection was observed with the 4.3kb-SV frequency increasing from 3% in 2014 to 98% in 2021 in Cameroon. A strong association was established between this SV and pyrethroid resistance in field populations and is reducing pyrethroid-only nets’ efficacy. Genetic crosses and qRT-PCR revealed that this SV enhances the expression of CYP6P9a/b but not CYP6P5. Within this structural variant (SV), we identified putative binding sites for transcription factors associated with the regulation of detoxification genes. An inverse correlation was observed between the 4.3kb SV and malaria parasite infection, indicating that mosquitoes lacking the 4.3kb SV were more frequently infected compared to those possessing it. Our findings highlight the underexplored role and rapid spread of SVs in the evolution of insecticide resistance and provide additional tools for molecular surveillance of insecticide resistance.
| Item Type: | Article |
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| Uncontrolled Keywords: | Animals; Humans; Anopheles; Malaria; Pyrethrins; Cytochrome P-450 Enzyme System; DNA Transposable Elements; Insecticides; Insecticide Resistance; Cameroon; Uganda; Mosquito Vectors; Animals; Anopheles; Pyrethrins; Insecticide Resistance; Mosquito Vectors; Malaria; DNA Transposable Elements; Cytochrome P-450 Enzyme System; Insecticides; Uganda; Humans; Cameroon; Infectious Diseases; Malaria; Vector-Borne Diseases; Rare Diseases; Genetics; 3.2 Interventions to alter physical and biological environmental risks; 2.2 Factors relating to the physical environment; Infection; 3 Good Health and Well Being; Animals; Anopheles; Pyrethrins; Insecticide Resistance; Mosquito Vectors; Malaria; DNA Transposable Elements; Cytochrome P-450 Enzyme System; Insecticides; Uganda; Humans; Cameroon; 0604 Genetics; Developmental Biology |
| Subjects: | Q Science > QH Natural history > QH301 Biology Q Science > QH Natural history > QH426 Genetics Q Science > QL Zoology |
| Divisions: | Biological and Environmental Sciences (from Sep 19) |
| Publisher: | Public Library of Science (PLoS) |
| SWORD Depositor: | A Symplectic |
| Date Deposited: | 27 Nov 2024 16:13 |
| Last Modified: | 27 Nov 2024 16:15 |
| DOI or ID number: | 10.1371/journal.pgen.1011344 |
| Editors: | Sirugo, G |
| URI: | https://researchonline.ljmu.ac.uk/id/eprint/24897 |
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