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Almeras L, Costa MM, Amalvict R, Guilliet J, Dusfour I, David JP, Corbel V. Potential of MALDI-TOF MS biotyping to detect deltamethrin resistance in the dengue vector Aedes aegypti. PLoS One 2024; 19:e0303027. [PMID: 38728353 PMCID: PMC11086877 DOI: 10.1371/journal.pone.0303027] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2024] [Accepted: 04/17/2024] [Indexed: 05/12/2024] Open
Abstract
Insecticide resistance in mosquitoes is spreading worldwide and represents a growing threat to vector control. Insecticide resistance is caused by different mechanisms including higher metabolic detoxication, target-site modification, reduced penetration and behavioral changes that are not easily detectable with simple diagnostic methods. Indeed, most molecular resistance diagnostic tools are costly and labor intensive and then difficult to use for routine monitoring of insecticide resistance. The present study aims to determine whether mosquito susceptibility status against the pyrethroid insecticides (mostly used for mosquito control) could be established by the protein signatures of legs and/or thoraxes submitted to MALDI-TOF Mass Spectrometry (MS). The quality of MS spectra for both body parts was controlled to avoid any bias due to unconformity protein profiling. The comparison of MS profiles from three inbreeds Ae. aegypti lines from French Guiana (IRF, IR03, IR13), with distinct deltamethrin resistance genotype / phenotype and the susceptible reference laboratory line BORA (French Polynesia), showed different protein signatures. On both body parts, the analysis of whole protein profiles revealed a singularity of BORA line compared to the three inbreeding lines from French Guiana origin, suggesting that the first criteria of differentiation is the geographical origin and/or the breeding history rather than the insecticide susceptibility profile. However, a deeper analysis of the protein profiles allowed to identify 10 and 11 discriminating peaks from leg and thorax spectra, respectively. Among them, a specific peak around 4870 Da was detected in legs and thoraxes of pyrethroid resistant lines compared to the susceptible counterparts hence suggesting that MS profiling may be promising to rapidly distinguish resistant and susceptible phenotypes. Further work is needed to confirm the nature of this peak as a deltamethrin resistant marker and to validate the routine use of MS profiling to track insecticide resistance in Ae. aegypti field populations.
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Affiliation(s)
- Lionel Almeras
- Département Microbiologie et Maladies Infectieuses, Institut de Recherche Biomédicale des Armées, Unité Parasitologie et Entomologie, Marseille, 13005, France
- Aix Marseille University, IRD, AP-HM, SSA, VITROME, Marseille, 13005, France
- IHU-Méditerranée Infection, Marseille, 13005, France
| | - Monique Melo Costa
- Département Microbiologie et Maladies Infectieuses, Institut de Recherche Biomédicale des Armées, Unité Parasitologie et Entomologie, Marseille, 13005, France
- Aix Marseille University, IRD, AP-HM, SSA, VITROME, Marseille, 13005, France
- IHU-Méditerranée Infection, Marseille, 13005, France
| | - Rémy Amalvict
- Département Microbiologie et Maladies Infectieuses, Institut de Recherche Biomédicale des Armées, Unité Parasitologie et Entomologie, Marseille, 13005, France
- Aix Marseille University, IRD, AP-HM, SSA, VITROME, Marseille, 13005, France
- IHU-Méditerranée Infection, Marseille, 13005, France
- Centre National de Référence du Paludisme, Marseille, 13005, France
| | - Joseph Guilliet
- Laboratoire d’Ecologie Alpine, UMR UGA-USMB-CNRS 5553, Université Grenoble Alpes, Grenoble, 38041, France
| | - Isabelle Dusfour
- Institut Pasteur de la Guyane, Vectopôle Amazonien Emile Abonnenc, Unité de Contrôle et Adaptation des Vecteurs, Cayenne, France
| | - Jean-Philippe David
- Laboratoire d’Ecologie Alpine, UMR UGA-USMB-CNRS 5553, Université Grenoble Alpes, Grenoble, 38041, France
| | - Vincent Corbel
- MIVEGEC, IRD, CNRS, University of Montpellier, Montpellier, France
- Laboratório de Fisiologia e Controle de Artrópodes Vetores (Laficave), Instituto Oswaldo Cruz (IOC), Fundacao Oswaldo Cruz (FIOCRUZ), Avenida Brasil, Rio de Janeiro–RJ, Brazil
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Uemura N, Itokawa K, Komagata O, Kasai S. Recent advances in the study of knockdown resistance mutations in Aedes mosquitoes with a focus on several remarkable mutations. CURRENT OPINION IN INSECT SCIENCE 2024; 63:101178. [PMID: 38346494 DOI: 10.1016/j.cois.2024.101178] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/24/2023] [Revised: 02/05/2024] [Accepted: 02/06/2024] [Indexed: 03/08/2024]
Abstract
The Aedes mosquito, which transmits the dengue fever virus and other viruses, has acquired resistance to pyrethroid insecticides in a naturally selective manner. Massive use of insecticides has led to the worldwide expansion of resistant populations. The major factor in pyrethroid resistance is knockdown resistance (kdr) caused by amino acid mutation(s) in the voltage-gated sodium channel, which is the target site of this insecticide group. Some kdr mutations can lead to a dramatic increase in resistance, and multiple mutations can increase the level of pyrethroid resistance by 10 to several-hundred. In this review, we summarize the kdr identified in Aedes mosquitoes with a focus on the recent advances in the study of kdr.
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Affiliation(s)
- Nozomi Uemura
- Department of Medical Entomology, National Institute of Infectious Diseases, Tokyo 162-8640, Japan
| | - Kentaro Itokawa
- Department of Medical Entomology, National Institute of Infectious Diseases, Tokyo 162-8640, Japan
| | - Osamu Komagata
- Department of Medical Entomology, National Institute of Infectious Diseases, Tokyo 162-8640, Japan
| | - Shinji Kasai
- Department of Medical Entomology, National Institute of Infectious Diseases, Tokyo 162-8640, Japan.
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Enayati A, Valadan R, Bagherzadeh M, Cheraghpour M, Nikookar SH, Fazeli-Dinan M, Hosseini-Vasoukolaei N, Sahraei Rostami F, Shabani Kordshouli R, Raeisi A, Nikpour F, Mirolyaei A, Bagheri F, Sedaghat MM, Zaim M, Weetman D, Hemigway J. Kdr genotyping and the first report of V410L and V1016I kdr mutations in voltage-gated sodium channel gene in Aedes aegypti (Diptera: Culicidae) from Iran. Parasit Vectors 2024; 17:34. [PMID: 38273349 PMCID: PMC10811842 DOI: 10.1186/s13071-024-06123-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2023] [Accepted: 01/08/2024] [Indexed: 01/27/2024] Open
Abstract
BACKGROUND Aedes aegypti is the main vector of arboviral diseases worldwide. The species invaded and became established in southern Iran in 2020. Insecticide-based interventions are primarily used for its control. With insecticide resistance widespread, knowledge of resistance mechanisms is vital for informed deployment of insecticidal interventions, but information from Iranian Ae. aegypti is lacking. METHODS Fifty-six Ae. aegypti specimens were collected from the port city of Bandar Lengeh in Hormozgan Province in the South of Iran in 2020 and screened for kdr mutations. The most common kdr mutations in Latin America and Asia (V410L, S989P, V1016G/I and F1534C), especially when present in combinations, are highly predictive of DDT and pyrethroid resistance were detected. Phylogenetic analyses based on the diversity of S989P and V1016G/I mutations were undertaken to assess the phylogeography of these kdr mutations. RESULTS Genotyping all four kdr positions of V410L, S989P, V1016G/I and F1534C revealed that only 16 out of the 56 (28.57%) specimens were homozygous wild type for all kdr mutation sites. Six haplotypes including VSVF (0.537), VSVC (0.107), LSVF (0.016), LSIF (0.071), VPGC (0.257) and LPGC (0.011) were detected in this study. For the first time, 11 specimens harbouring the V410L mutation, and 8 samples with V1016I mutation were found. V410L and V1016I were coincided in 8 specimens. Also, six specimens contained 1016G/I double mutation which was not reported before. CONCLUSIONS The relatively high frequency of these kdr mutations in Iranian Ae. aegypti indicates a population exhibiting substantial resistance to pyrethroid insecticides, which are used widely in control operations and household formulations. The detection of the 410L/1016I kdr mutant haplotype in Iranian Ae. aegypti suggests possible convergence of invasive populations from West Africa or Latin America. However, as Iran has very limited maritime/air connections with those African countries, a Latin American origin for the invasive Ae. aegypti in Iran is more plausible.
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Affiliation(s)
- Ahmadali Enayati
- Department of Medical Entomology and Vector Control, School of Public Health and Health Sciences Research Center, Mazandaran University of Medical Sciences, Sari, Iran.
| | - Reza Valadan
- Department of Immunology and Molecular and Cellular Biology Research Center, Mazandaran University of Medical Sciences, Sari, Iran
| | - Mahboobeh Bagherzadeh
- Department of Medical Entomology and Vector Control, School of Public Health, Student Research Center, Mazandaran University of Medical Sciences, Sari, Iran
| | - Mohammad Cheraghpour
- Department of Medical Entomology and Vector Control, School of Public Health, Student Research Center, Mazandaran University of Medical Sciences, Sari, Iran
| | - Seyed Hassan Nikookar
- Health Sciences Research Center, Department of Medical Entomology and Vector Control, School of Public Health, Mazandaran University of Medical Sciences, Sari, Iran
| | - Mahmoud Fazeli-Dinan
- Health Sciences Research Center, Department of Medical Entomology and Vector Control, School of Public Health, Mazandaran University of Medical Sciences, Sari, Iran
| | - Nasibeh Hosseini-Vasoukolaei
- Department of Medical Entomology and Vector Control, School of Public Health, Mazandaran University of Medical Sciences, Sari, Iran
| | - Farzaneh Sahraei Rostami
- Department of Medical Entomology and Vector Control, School of Public Health, Mazandaran University of Medical Sciences, Sari, Iran
| | - Razieh Shabani Kordshouli
- Department of Medical Entomology and Vector Control, School of Public Health, Mazandaran University of Medical Sciences, Sari, Iran
| | - Ahmad Raeisi
- Vector Borne Diseases Control Department, Iran CDC, Ministry of Health and Medical Education, Tehran, Iran
- Department of Medical Parasitology & Mycology, Tehran University of Medical Sciences, Tehran, Iran
| | - Fatemeh Nikpour
- Vector Borne Diseases Control Department, Iran CDC, Ministry of Health and Medical Education, Tehran, Iran
- Department of Environmental Chemical Pollutants and Pesticides, Institute for Environmental Research, Tehran University of Medical Sciences, Tehran, Iran
| | - Abdolreza Mirolyaei
- Vector Borne Diseases Control Department, Iran CDC, Ministry of Health and Medical Education, Tehran, Iran
| | - Fatemeh Bagheri
- Hormozgan Provincial Health Center, Department of Communicable Diseases Control, Hormozgan University of Medical Sciences, Bandar Abbas, Iran
| | - Mohammad Mehdi Sedaghat
- Department of Medical Entomology and Vector Control, Tehran University of Medical Sciences, Tehran, Iran
| | - Morteza Zaim
- Department of Medical Entomology and Vector Control, Tehran University of Medical Sciences, Tehran, Iran
| | - David Weetman
- Vector Biology Department, Liverpool School of Tropical Medicine, Liverpool, UK
| | - Janet Hemigway
- Vector Biology Department, Liverpool School of Tropical Medicine, Liverpool, UK
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Henriques-Santos BM, Xiong C, Pietrantonio PV. Automated analysis of feeding behaviors of females of the mosquito Aedes aegypti using a modified flyPAD system. Sci Rep 2023; 13:20188. [PMID: 37980438 PMCID: PMC10657447 DOI: 10.1038/s41598-023-47277-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2023] [Accepted: 11/11/2023] [Indexed: 11/20/2023] Open
Abstract
Mosquitoes present a global health challenge due to their ability to transmit human and animal pathogens upon biting and blood feeding. The investigation of tastants detected by mosquitoes and their associated feeding behaviors is needed to answer physiological and ecological questions that could lead to novel control methods. A high-throughput system originally developed for research in fruit flies feeding behavior, the flyPAD, was adapted and tested for behaviors associated with the interaction or consumption of liquid diets offered to females of the mosquito Aedes aegypti Liverpool strain. Females were given water, sucrose solution and sheep blood in choice and non-choice assays. The volume ingested was evaluated with fluorescein. The placement of the system on a heated surface allowed blood consumption, and without females puncturing a membrane. The flyPAD system recorded nine feeding behavioral variables, of which the number of sips and number of activity bouts correlated with meal volume ingested for both sucrose solution and blood. The adaptation to mosquitoes of the flyPAD system differentiated feeding behavior variables between two feeding deterrents, capsaicin, and caffeine. The flyPAD has potential to quickly assess diverse tastants in both sucrose and blood and may contribute to characterizing more precisely their mode of action.
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Affiliation(s)
| | - Caixing Xiong
- Department of Entomology, Texas A&M University, College Station, TX, 77843-2475, USA
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Souza BS, Lima LF, Galardo AKR, Corbel V, Lima JBP, Martins AJ. Genetic structure and kdr mutations in Aedes aegypti populations along a road crossing the Amazon Forest in Amapá State, Brazil. Sci Rep 2023; 13:17167. [PMID: 37821679 PMCID: PMC10567682 DOI: 10.1038/s41598-023-44430-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2023] [Accepted: 10/08/2023] [Indexed: 10/13/2023] Open
Abstract
Insecticide resistance in Aedes aegypti poses a significant threat to disease control. One form of resistance, caused by kdr mutations in the NaV gene, hinders vector control efforts in Brazil. Despite genetic differences typically accumulating among isolated populations, this mosquito can actively and passively disperse through human transportation. Our study investigated the genetic structure and spread of kdr mutations in Ae. aegypti populations across six localities in Amapá State, Brazil, within the Amazonian Forest. Using 12 microsatellite loci and qPCR methods, we assessed genetic structure and identified three common kdr mutations (V410L, V1016I, and F1534C). High prevalence of kdr alleles was observed in all localities, indicating widespread distribution in Amapá State. Microsatellite analysis revealed differentiation among mosquito populations, dividing them into two distinct clusters supported by Bayesian and DAPC analyses. Oiapoque, located along the northern border with French Guiana, exhibited the highest kdr frequencies and genetic differentiation compared to other localities. Our findings suggest genetic structure in Ae. aegypti populations in Amapá State, with some passive gene flow between clusters. The study underscores the need for continuous surveillance of Ae. aegypti populations to monitor the spread of insecticide resistance and inform effective vector control strategies.
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Affiliation(s)
- Barbara S Souza
- Laboratório de Biologia, Controle e Vigilância de Insetos Vetores (LBCVIV), Instituto Oswaldo Cruz (IOC)/FIOCRUZ, Rio de Janeiro, RJ, 21040-900, Brazil
| | - Leticia F Lima
- Laboratório de Bioinformática, Instituto de Química (UFRJ), Rio de Janeiro, RJ, 21941-909, Brazil
| | - Allan K R Galardo
- Instituto de Pesquisas Científicas e Tecnológicas do Estado do Amapá/IEPA, Macapá, AP, 68.908-220, Brazil
| | - Vincent Corbel
- Laboratório de Biologia, Controle e Vigilância de Insetos Vetores (LBCVIV), Instituto Oswaldo Cruz (IOC)/FIOCRUZ, Rio de Janeiro, RJ, 21040-900, Brazil
- Institut de Recherche Pour le Développement (IRD), MIVEGEC, CNRS, IRD, Université de Montpellier, 34090, Montpellier, France
| | - Jose Bento P Lima
- Laboratório de Biologia, Controle e Vigilância de Insetos Vetores (LBCVIV), Instituto Oswaldo Cruz (IOC)/FIOCRUZ, Rio de Janeiro, RJ, 21040-900, Brazil
| | - Ademir J Martins
- Laboratório de Biologia, Controle e Vigilância de Insetos Vetores (LBCVIV), Instituto Oswaldo Cruz (IOC)/FIOCRUZ, Rio de Janeiro, RJ, 21040-900, Brazil.
- Instituto Nacional de Ciência e Tecnologia em Entomologia Molecular (INCT-EM), UFRJ, Rio de Janeiro, RJ, 21941-902, Brazil.
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Lee HJ, Shields MR, Landeta A, Saldaña MA, Fredregill CL, Pietrantonio PV. Evaluation of field resistance in field-collected mosquito Culex quinquefasciatus Say through quantification of ULV permethrin/PBO formulation in field bioassays. PEST MANAGEMENT SCIENCE 2023; 79:3934-3949. [PMID: 37248198 DOI: 10.1002/ps.7587] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/04/2023] [Revised: 05/24/2023] [Accepted: 05/29/2023] [Indexed: 05/31/2023]
Abstract
BACKGROUND Pyrethroids are among the most applied adulticides worldwide to control mosquito vectors for prevention of arboviral diseases transmission. However, pesticide resistance development in a mosquito population could lead to decreased control efficacy. While most studies investigate the resistant genotype (i.e. kdr, CYP450, etc.) as explanatory variables, few field efficacy studies have measured pesticide quantities deposited at different distances from the sprayer in association with observed mosquito mortality. The current study determined field delivered amounts of an applied ULV permethrin/PBO formulation (31% permethrin + 66% piperonyl butoxide) by GC/MS and estimated practical resistance ratios using caged mosquito females. RESULTS For field samples, the extraction method recovered 78 ± 3.92-108 ± 8.97% of the permethrin/PBO formulation when utilizing the peaks of PBO from GC/MS to estimate the concentrations of adulticide deposited near the mosquito cages. The field bioassay showed that the spatial distribution of permethrin/PBO formulation was heterogeneous among three pseudo-replicates within the same distance. Within the quantifiable permethrin/PBO range of 15.7-51.4 ng/cm2 , field-collected mosquito mortalities started at 64% and linearly increased reaching 100% only in two areas, while all Sebring susceptible mosquitoes died. The field LC95 resistance ratio (RR) of F0 Cx. quinquefasciatus ranged from 2.65-3.51, falling within the 95% CI of RR95 estimated by laboratory vial assays. Tests with and without PBO indicated P450's enzymes contributed to field resistance. CONCLUSION Results showed the suitability of the collection and quantification method to estimate the field resistance ratio at the applied pesticide rate. Pesticide quantification would also allow the association of the known frequencies of resistance mechanisms (e.g. kdr, CYP450) with field mortalities to estimate the resistance level conferred by such mechanisms. © 2023 The Authors. Pest Management Science published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry.
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Affiliation(s)
- Han-Jung Lee
- Department of Entomology, Texas A&M University, College Station, TX, USA
| | - Michael Ray Shields
- Geochemical and Environmental Research Group, Texas A&M University, College Station, TX, USA
| | - Anais Landeta
- Harris County Public Health, Mosquito and Vector Control Division (HCPH-MVCD), Houston, TX, USA
| | - Miguel Arturo Saldaña
- Harris County Public Health, Mosquito and Vector Control Division (HCPH-MVCD), Houston, TX, USA
| | - Chris Lee Fredregill
- Harris County Public Health, Mosquito and Vector Control Division (HCPH-MVCD), Houston, TX, USA
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Ayettey J, Ablorde A, Amlalo GK, Mensah BA, Kudom AA. Entomological surveillance on Aedes aegypti during covid 19 period in Cape Coast, Ghana: Risk of arboviral outbreaks, multiple insecticide resistance and distribution of F1534C, V410L and V1016I kdr mutations. PLoS Negl Trop Dis 2023; 17:e0011397. [PMID: 37256856 DOI: 10.1371/journal.pntd.0011397] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2022] [Accepted: 05/22/2023] [Indexed: 06/02/2023] Open
Abstract
BACKGROUND The study assessed the risk of transmission of Aedes-borne arboviruses in a community at Cape Coast during the Covid-19 restriction period in 2020 based on entomological indices. The spatial distribution of insecticide resistance was also assessed in Ae. aegypti population from Cape Coast. METHODS Three larval indices were calculated from a household larval survey in 100 randomly selected houses. WHO susceptibility bioassay was performed on female adult Ae. aegypti that were reared from the larvae collected from household containers and other receptacles located outside houses against four insecticides. The mosquitoes were also screened for F1534C, V1016I, and V410L kdr mutations. RESULTS The estimated larval indices in the study community were House index- 34%, Container index- 22.35%, and Breteau index- 2.02. The mosquito population was resistant to Deltamethrin (0.05%), DDT (4%), Fenitrothion (1%), and Bendiocarb (0.1%). A triple kdr mutation, F1534C, V410L and V1016I were detected in the mosquito population. CONCLUSION The study found the risk of an outbreak of Aedes-borne diseases lower in the covid-19 lockdown period than before the pandemic period. The low risk was related to frequent clean-up exercises in the community during the Covid-19 restriction period. Multiple insecticide resistance couple with three kdr mutations detected in the study population could affect the effectiveness of control measures, especially in emergency situations. The study supports sanitation improvement as a tool to control Ae. aegypti and could complement insecticide-based tools in controlling this vector.
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Affiliation(s)
- Joana Ayettey
- Department of Conservation Biology and Entomology, University of Cape Coast, Cape Coast-Ghana
| | - Aikins Ablorde
- Center for International Health, Ludwig Maximilian University of Munich, Germany
| | - Godwin K Amlalo
- Department of Parasitology, Noguchi Memorial Institute for Medical Research, University of Ghana, Accra Ghana
| | - Ben A Mensah
- Department of Conservation Biology and Entomology, University of Cape Coast, Cape Coast-Ghana
| | - Andreas A Kudom
- Department of Conservation Biology and Entomology, University of Cape Coast, Cape Coast-Ghana
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Sombié A, Ouédraogo WM, Oté M, Saiki E, Sakurai T, Yaméogo F, Sanon A, McCall PJ, Kanuka H, Weetman D, Badolo A. Association of 410L, 1016I and 1534C kdr mutations with pyrethroid resistance in Aedes aegypti from Ouagadougou, Burkina Faso, and development of a one-step multiplex PCR method for the simultaneous detection of 1534C and 1016I kdr mutations. Parasit Vectors 2023; 16:137. [PMID: 37076920 PMCID: PMC10116651 DOI: 10.1186/s13071-023-05743-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2022] [Accepted: 03/16/2023] [Indexed: 04/21/2023] Open
Abstract
BACKGROUND Since 2000, Burkina Faso has experienced regular dengue cases and outbreaks, making dengue an increasingly important health concern for the country. Previous studies in Burkina Faso reported that resistance of Aedes aegypti to pyrethroid insecticides was associated with the F1534C and V1016I kdr mutations. The current study reports high resistance of Ae. aegypti populations to pyrethroid insecticides, likely supported by mutations in the voltage-gated sodium channel, here evidenced by genotyping the kdr SNPs V410L, V1016I and F1534C. We also describe a new multiplex PCR-based diagnostic of F1534C and V1016I kdr SNPs. METHODS Larvae of Ae. aegypti were collected from three health districts of Ouagadougou in 2018. The resistance status of Ae. aegypti to permethrin (15 μg/ml) and deltamethrin (10 μg/ml) was tested using bottles and to malathion (5%) using WHO tube tests. All bioassays used 1-h exposure and mortality recorded 24 h post-exposure. Bioassay results were interpreted according to WHO thresholds for resistance diagnosis. The kdr mutations were screened using AS-PCR and TaqMan methods in exposed and non-exposed Aedes mosquitoes. RESULTS Females from all health districts were resistant to permethrin and deltamethrin (< 20% mortality) but were fully susceptible to 5% malathion. The F1534C and V1016I kdr mutations were successfully detected using a newly developed multiplex PCR in perfect agreement with TaqMan method. The 1534C/1016I/410L haplotype was correlated with permethrin resistance but not with deltamethrin resistance; however, the test power was limited by a low frequency of dead individuals in deltamethrin exposure. CONCLUSIONS Resistance to pyrethroid insecticides is associated with kdr mutant haplotypes, while the absence of substantial resistance to malathion suggests that it remains a viable option for dengue vector control in Ouagadougou.
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Affiliation(s)
- Aboubacar Sombié
- Laboratoire d'Entomologie Fondamentale et Appliquée, Université Joseph Ki-Zerbo, Ouagadougou, Burkina Faso
| | - Wendegoudi Mathias Ouédraogo
- Laboratoire d'Entomologie Fondamentale et Appliquée, Université Joseph Ki-Zerbo, Ouagadougou, Burkina Faso
- Programme National de Lutte Contre Les Maladies Tropicales Négligées, Ministère de la Santé, Ouagadougou, Burkina Faso
| | - Manabu Oté
- Center for Medical Entomology, The Jikei University School of Medicine, Tokyo, Japan
- Department of Tropical Medicine, The Jikei University School of Medicine, Tokyo, Japan
| | - Erisha Saiki
- Center for Medical Entomology, The Jikei University School of Medicine, Tokyo, Japan
- Laboratory Animal Facilities, The Jikei University School of Medicine, Tokyo, Japan
| | - Tatsuya Sakurai
- Center for Medical Entomology, The Jikei University School of Medicine, Tokyo, Japan
- Laboratory Animal Facilities, The Jikei University School of Medicine, Tokyo, Japan
| | - Félix Yaméogo
- Laboratoire d'Entomologie Fondamentale et Appliquée, Université Joseph Ki-Zerbo, Ouagadougou, Burkina Faso
| | - Antoine Sanon
- Laboratoire d'Entomologie Fondamentale et Appliquée, Université Joseph Ki-Zerbo, Ouagadougou, Burkina Faso
| | - Philip J McCall
- Department of Vector Biology, Liverpool School of Tropical Medicine, Liverpool, UK
| | - Hirotaka Kanuka
- Center for Medical Entomology, The Jikei University School of Medicine, Tokyo, Japan
- Department of Tropical Medicine, The Jikei University School of Medicine, Tokyo, Japan
| | - David Weetman
- Department of Vector Biology, Liverpool School of Tropical Medicine, Liverpool, UK
| | - Athanase Badolo
- Laboratoire d'Entomologie Fondamentale et Appliquée, Université Joseph Ki-Zerbo, Ouagadougou, Burkina Faso.
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