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First report of the L1014F kdr mutation in wild populations of Anopheles arabiensis in Cabo Verde, West Africa

Parasites & Vectors volume 14, Article number: 582 (2021) Cite this article

Abstract

Background

Due to the lack of vaccines, malaria control mainly involves the control of anopheline vectors (Anopheles spp.) using chemical insecticides. However, the prolonged and indiscriminate use of these compounds has led to the emergence of resistance in Anopheles populations in Africa. Insecticide resistance surveillance programs are less frequent in Cabo Verde than in other African countries. This study aimed to investigate the circulation of the L1014F and L1014S alleles in natural populations of Anopheles arabiensis collected from two sampling sites in the city of Praia, Cabo Verde.

Methods

Anopheles larvae were collected from the two sampling sites and reared in the laboratory until the adult stage. Mosquitoes were first morphologically identified by classical taxonomy and then by molecular species identification using molecular markers. All Anopheles arabiensis were subjected to PCR analysis to screen for mutations associated to resistance in the Nav gene.

Results

A total of 105 mosquitoes, all belonging to the Anopheles gambiae complex, were identified by classical taxonomy as well as by molecular taxonomy. Molecular identification showed that 100% of the An. gambiae senso lato specimens analyzed corresponded to An. arabiensis. Analysis of the Nav gene revealed the presence of L1014S and L1014F alleles with frequencies of 0.10 and 0.19, respectively.

Conclusions

Our data demonstrated, for the first time, the presence of the L1014F allele in the An. arabiensis population from Cabo Verde, as well as an increase in the frequency of the kdr L1014S allele reported in a previous study. The results of this study demonstrate the need to establish new approaches in vector control programs in Cabo Verde.

Graphical Abstract

Malaria, caused by Plasmodium spp., is considered to be one of the most important vector-borne diseases from a global perspective. These parasites are transmitted by anopheline mosquitos (Anopheles spp.), and the highest world incidence is found in the African continent [1], where Plasmodium spp. are mainly transmitted by mosquitoes of the Anopheles gambiae complex [2,3,4]. Currently, this complex consists of at least seven cryptic species [5, 6], of which the most efficient are Anopheles gambiae sensu stricto (s.s.) and An. arabiensis [7,8,9]. In Cabo Verde, an archipelago located in the eastern Atlantic Ocean, off the coast of West Africa, the only species from this complex associated with disease transmission is An. arabiensis [10,11,12,13,14]. Malaria is considered to be endemic in the archipelago, although transmission has varied over the years. However, in the last 3 consecutive years there has been no local transmission in Cabo Verde; consequently, the archipelago is eligible to apply for the World Health Organization (WHO) certification of malaria elimination [15].

Malaria prevention relies mostly on vector control interventions based on the use of chemical approaches, such as long-lasting insecticidal nets (LLINs) and indoor residual spraying (IRS) [16, 17]. In Cabo Verde, since 1999, the vector control program has included the use of IRS with deltamethrin (an insecticide of the pyrethroid class) to control adult mosquitoes [18].

The extensive and indiscriminate use of chemical compounds has resulted in the emergence of a wide range of resistance in wild Anopheles populations, mainly in African countries [19]. Two mechanisms have been reported underlying resistance to xenobiotics in these populations: target-site insensitivity and metabolic resistance [20, 21]. Both mechanisms have already been documented in An. arabiensis in West Africa [22]. Target-site insensitivity in Anopheles is caused mainly by mutations present in the voltage-gated sodium channel (Nav) (domains II–IV) and they are commonly known as knockdown resistance (kdr) mutations. This particular mechanism has been reported in several studies conducted throughout the African continent [23]. Kdr mutations are among the best characterized point mutations and are often associated with resistance to pyrethroid (PYR) and organochlorine (OC) insecticides [24]. Two kdr mutations have been detected in the Nav gene (at position 1014 of the encoded protein) of Anopheles populations: the replacement of leucine by phenylalanine (L1014F), found mainly in West Africa (the “kdr-west”), and the replacement of leucine by serine (L1014S), found mainly in East Africa (the “kdr-east”) [20, 25,26,27]. These mutations have been frequently detected in mosquitoes from African countries [28,29,30,31,32,33] and they have been used as a molecular marker for PYR resistance in Anopheles populations [34,35,36].

Information on the molecular mechanisms underlying resistance to xenobiotics in Anopheles populations is limited in Cabo Verde and, consequently, poorly understood in the archipelago. So far, a single molecular study has been carried out in Cabo Verde, which reported circulation of the L1014S mutation in local An. arabiensis [13].

The historical use of insecticides to control malaria in Cabo Verde reveals the necessity of finding molecular markers that may aid the detection and management of insecticide resistance in An. arabiensis. Thus, the present study aimed to investigate the circulation of the L1014F and L1014S alleles, often associated with resistance to pyrethroids, in natural An. arabiensis populations collected from Santiago Island, in Cabo Verde.

Cabo Verde is an archipelago of volcanic origin, composed of ten islands, located approximately 450 km off the West African coast, at the height of Senegal. The archipelago is characterized by its dry tropical climate and is inhabited by approximately 500,000 people [14, 37]. Approximately 60% of the entire population resides on the largest island of the archipelago, Santiago (991 km2), on which the capital city of Praia is located (Fig. 1) [38, 39]. This study was carried out in two neighborhoods of Praia: Achada Grande Trás (AGT; 23°29′12.22′′W, 14°55′11.85′′N) and Várzea (23°30′44.32′′W, 14°55′1.27′′N) (Fig. 1). The city of Praia is located on the southern coast of Santiago Island and is the economic and cultural center of Cabo Verde. Geographically, Praia may be described as a set of plateaus and respective surrounding valleys [40].

Fig. 1
figure 1

Geographic location of the Cabo Verde archipelago and collection sites. This map was edited in ArcGis, 2020

Full size image

Anopheles larvae were collected in May and October 2017 (a single collection was carried out per month) in natural mosquito breeding sites, using an adapted 1-pint dipper. After each collection, larvae were sent to the insectary of the Entomology Department of Jean Piaget University of Cabo Verde and reared until the adult stage, under standard laboratory conditions (25–30 °C, 65–75% relative humidity and a 12:12-h light:dark cycle) [26, 41]. These specimens were then identified by classical taxonomy using the identification key of Ribeiro et al. [10]. Only mosquitoes from the An. gambiae complex were used for subsequent molecular analysis. Following morphological identification, these mosquitoes were preserved in 70% ethanol until DNA extraction and sent to the Entomology Department of the Aggeu Magalhães Institute (FIOCRUZ-PE) for molecular analysis.

Genomic DNA from individual mosquitoes was extracted following the protocol described by Ayres et al. [42] and the extracted DNA then stored at – 20 °C until analysis. Molecular identification of species was performed by PCR, according to the protocol described by Scott et al. [43]. DNA samples from An. gambiae sensu s.s., kindly provided by Dr. Maria Helena Silva Filha (Entomology Department at FIOCRUZ-PE), were included in each reaction as positive controls. After species identification, DNA samples were screened for the L1014F and L1014S kdr mutations, using a PCR protocol described by da Cruz et al. [13].

PCR products were sequenced using both forward/reverse primers at the Nucleus of Technology Platforms (NPT) of the FIOCRUZ-PE, using the Sanger method (Thermo Fisher Scientific ABI 3500xL genetic analyzer system; Applied Biosystems, Foster City, CA, USA). The CodonCode Aligner program (version 3.7.1) was used to check the quality of both sequences, as well as to edit and assemble the contigs (assembly criteria: sequences with  ≥  20 quality score were used to generate consensus sequences, based on the PHRED program). Sequence alignment and mutation identification were performed using the BioEdit program (version 7.2.6) [44].

A total of 105 Anopheles specimens belonging to the An. gambiae complex were identified by classical taxonomy and submitted for molecular species identification. The molecular analysis identified all individuals so analyzed as An. arabiensis, and these specimens were used to screen for kdr mutations. Of these 105 individuals submitted for kdr-east/kdr-west genotyping and sequencing, 91 resulted in informative sequences. Based on the sequences of these 91 mosquitoes, 10 were determined to be heterozygous (RS) and four homozygous (RR) for the kdr-east mutation (L1014S); 15 were heterozygous (RS) and 10 homozygous (RR) for the kdr-west mutation (L1014F); the remaining mosquitoes (n  = 52) were homozygous for the susceptible genotype (SS) (Table 1).

Table 1 L1014S/L1014F genotype and allele frequency from Anopheles arabiensis collected in Praia City, Cabo Verde
Full size table

The L1014S and L1014F allele frequencies were 0.10 and 0.19, respectively (Table 1). Although the two alleles were found in both collection areas, the L1014S allele was found more frequently in individual specimens collected in AGT, while the L1014F allele was found more frequently in those collected in Várzea (Fig. 2).

Fig. 2
figure 2

Allelic frequency distribution of the L1014S and L1014F mutations of the Nav gene at the collection sites in Praia, Cabo Verde. n is the total number of individuals used to detect the L1014S and L1014F mutations in the Nav gene

Full size image

The surveillance of alleles associated with insecticide resistance in An. arabiensis populations is more frequent in other African countries than in Cabo Verde. However, Cabo Verde does not carry out surveillance in the same way as other African countries [45]. This study provides an update on the presence and frequency of kdr alleles in natural populations of An. arabiensis in Cabo Verde.

Our results demonstrate, for the first time, the presence of the 1014F allele in the An. arabiensis population from Cabo Verde. Although the sampling periods and localities differ from those in the study of da Cruz et al. [13], our data also show that the frequency of the 1014S allele (kdr-east) has increased, from 0.073 in da Cruz et al. [13] in samples collected in Cabo Verde in 2015, to 0.10 (present study). This difference shows that this allele is being gradually selected.

The kdr-west and kdr-east mutations have been found in several countries of the African continent, such as Burkina Faso, Côte d’Ivoire, Togo, Tanzania, Kenya, Senegal, Uganda, Ethiopia and Democratic Republic of Congo [24, 28, 30, 32, 33, 46,47,48,49,50,51,52]. This distribution indicates a dissemination of these two alleles across the continent as a consequence of gene flow between the different Anopheles populations and biogeographic regions [53].

In the present study, both mutations were found in the two study locations (AGT and Várzea), indicating that these mutations may be well distributed in Praia, where vector control based on chemical compounds is more frequent. However, a broader collection must be performed in other neighborhoods in the city of Praia to better estimate the allele frequency and their geographical distribution. As mentioned by da Cruz et al. [13], it is possible that the high frequency of alleles is associated with frequent use of pyrethroids in certain locations. More recently, temephos resistance was reported in An. arabiensis from the city of Praia [54], collected at the same time and at the same locations, which suggest a possible selective pressure for resistance to insecticides due to their greater use (frequency and quantity). Unfortunately, there is currently no public data on the use of pyrethroids by location to allow any estimation of a possible association between the use of chemical compounds on the island and the reported resistance data.

It is important to note that this is the second study related to mutations associated with molecular resistance in An. arabiensis carried out in Cabo Verde. These kdr mutations found in our study may be responsible for the resistance to deltamethrin 0.05% reported by DePina et al. [55] in the An. arabiensis population from the city of Praia. Those samples were collected during the same period that our samples were collected. The results suggest that the vector is adapting to the insecticides used in the local vector control program. The presence of these mutations represent a threat to vector control in Cabo Verde, since LLINs, a measure recently implemented by the Ministry of Health, contain deltamethrin, which could contribute to an increase in resistance to pyrethroids in the wild Anopheles population.

The results found in this study emphasize the need for frequent monitoring of the anopheline’s susceptibility to insecticides used in the vector control program in Cabo Verde. The WHO [23] recommends periodical monitoring of insecticide resistance in vector populations and that the monitoring process of insecticide resistance in malaria vector mosquitoes includes tests to determine the phenotype frequency (e.g. bioassays) and the mechanisms of resistance (e.g. molecular tests that determine the allele and genotype frequency). Unfortunately, in this study, it was not possible to perform bioassays to determine the phenotype of resistance to pyrethroids; therefore, we strongly recommend that in future studies, phenotypic analysis be performed followed by the determination of molecular mechanisms of resistance.

This study revealed an increase in the frequency of the kdr 1014S allele, when compared with previous findings, as well the presence of the kdr 1014F allele (identified for the first time) in An. arabiensis individuals collected on the island of Santiago. These results highlight the urgent need to create new vector surveillance strategies to establish new approaches in the vector control program in Cabo Verde. Molecular monitoring of resistance to chemical insecticides should continue to be carried out in order to guide the competent authorities in making decisions, such as the implementation of novel insecticides in the malaria vector control program in Cabo Verde.

Availability of data and materials

All data generated or analyzed during this study are included in this published article. The DNA sequences obtained here for each mutation were submitted to GenBank with the following access codes: RR (MW577186) and RS (MW577187) for the L1014F allele; and RR (MW577183) and RS (MW577184) for the L1014S allele. For the susceptible genotype (SS) the access code is MW577185.

Abbreviations

AGT:

Achada Grande Trás

IRS:

Indoor residual spraying

kdr :

Knockdown resistance

LLINs:

Long-lasting insecticide nets

Na v :

Voltage-gated sodium channel

RR:

Homozygous individuals for L1014F/S mutations

RS:

Heterozygous individuals

SS:

Homozygous individuals

WHO:

World Health Organization

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Acknowledgements

The authors would like to thank the Technological Platform of Aggeu Magalhães Institute for helping with the sequencing. The GIDTPiaget group, in particular Sílvia Gonçalves Pires, is thanked for helping with mosquito collections. The authors would like to thank Rodrigo Loyo for producing the maps.

Funding

This research was funded by Capes (Coordenação de Aperfeiçoamento de Pessoal de Nível Superior—Brasil, Grant Number: 0021/13), Fundação de Amparo à Ciência e Tecnologia do Estado de Pernambuco (APQ-0085-2.13/16) and Fiocruz.

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  1. Departamento de Entomologia, Instituto Aggeu Magalhães/Fundaçao Oswaldo Cruz (FIOCRUZ-PE), Av. Professor Moraes Rego s/n, Cidade Universitaria, Recife, PE, 50670-420, Brazil

    Derciliano Lopes da Cruz, Marcelo Henrique Santos Paiva, Duschinka Ribeiro Duarte Guedes & Constância Flávia Junqueira Ayres

  2. Centro Academico do Agreste, Universidade Federal de Pernambuco, Rodovia BR-104, km 59—Nova Caruaru, Caruaru, PE, 55002-970, Brazil

    Marcelo Henrique Santos Paiva

  3. Departamento de Parasitologia, Instituto Aggeu Magalhaes/Fundaçao Oswaldo Cruz (FIOCRUZ-PE), Av. Professor Moraes Rego s/n, Cidade Universitária, Recife, PE, 50670-420, Brazil

    Elainne Christine de Souza Gomes

  4. Universidade Jean Piaget (UniPiaget), Praia, Caixa, 775, Cape Verde

    Silvia Gonçalves Pires & Lara Ferrero Gomez

Authors
  1. Derciliano Lopes da Cruz
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  2. Marcelo Henrique Santos Paiva
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  3. Duschinka Ribeiro Duarte Guedes
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  4. Elainne Christine de Souza Gomes
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  5. Silvia Gonçalves Pires
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  6. Lara Ferrero Gomez
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  7. Constância Flávia Junqueira Ayres
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Contributions

DC made substantial contributions to conception and design, or acquisition of data. DC conducted all the experiments and was a major contributor in writing the manuscript. MP, DG, EG, LG, SP and CA were involved in drafting the manuscript and revising it critically for important intellectual content. CA and MP supervised the project. All authors read and approved the final version of the manuscript.

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Correspondence to Marcelo Henrique Santos Paiva.

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da Cruz, D.L., Paiva, M.H.S., Guedes, D.R.D. et al. First report of the L1014F kdr mutation in wild populations of Anopheles arabiensis in Cabo Verde, West Africa. Parasites Vectors 14, 582 (2021). https://0-doi-org.brum.beds.ac.uk/10.1186/s13071-021-05088-4

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  • DOI: https://0-doi-org.brum.beds.ac.uk/10.1186/s13071-021-05088-4

Keywords

Parasites & Vectors

ISSN: 1756-3305

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