Demographic history and population structure of Anopheles pseudopunctipennis in Argentina based on the mitochondrial COI gene
© Dantur Juri et al.; licensee BioMed Central Ltd. 2014
Received: 28 May 2014
Accepted: 26 August 2014
Published: 4 September 2014
Anopheles pseudopunctipennis is an important malaria vector in the Neotropical region and the only species involved in Plasmodium transmission in the Andean foothills. Its wide geographical distribution in America, high preference for biting humans and capacity to rest inside dwellings after feeding, are attributes contributing to its vector status. Previous reports have tried to elucidate its taxonomic status, distinguishing populations from North, Central and South America. In the present study we used a mitochondrial marker to examine the demographic history of An. pseudopunctipennis in northwestern Argentina.
Twelve localities were selected across 550 km of the distribution of this species in Argentina, including two near the Bolivian border and several in South Tucumán, for sampling. A fragment of the cytochrome oxidase I (COI) gene was sequenced and haplotype relationships were analyzed by a statistical parsimony network and a Neighbor-Joining (NJ) tree. Genetic differentiation was estimated with FS T. Historical demographic processes were evaluated using diversity measures, neutrality tests and mismatch distribution.
Forty-one haplotypes were identified, of which haplotype A was the most common and widely distributed. Neither the network nor the NJ tree showed any geographic differentiation between northern and southern populations. Haplotype diversities, Tajima’s D T and Fu & Li’s F and D neutrality tests and mismatch distribution supported a scenario of Holocene demographic expansion.
The demographic pattern suggests that An. pseudopunctipennis has undergone a single colonization process, and the ancestral haplotype is shared by specimens from all localities, indicating mitochondrial gene flow. Genetic differentiation was minimal, observed only between one northern and one southern locality. The estimated time of the population expansion of this species was during the Holocene. These data suggest that regional vector control measures would be equally effective in both northern and southern localities sampled, but also that insecticide resistant genes may spread rapidly within this region.
Malaria affects millions of people globally every year. In 2010, 216 million malaria cases were registered, 81% of them in Africa. Approximately half of the world’s population lives in areas with some risk of malaria transmission, and in America this number is 137 million people[1, 2]. Differences in transmission intensity, the presence of several competent mosquito vector species, multiple parasite species, human migration and anthropogenic environmental changes, are some of the factors that contribute to wide variation in malaria. In addition, the presence of a suitable vector with characteristics such as endophily, anthropophily, endophagy, longevity, high titer of sporozoites and high effective local vector population size are essential for transmission to occur.
In the Americas, different malaria vectors are associated with distinctive eco-regions. Specifically Anopheles (Anopheles) pseudopunctipennis Theobald is involved in Andean foothills and coastal area malaria transmission. The eco-regional classifications consider the anthropogenic environmental changes that can affect the distribution and abundance of the vector and, therefore, the intensity of Plasmodium transmission. For instance, the appearance of An. pseudopunctipennis on the dry coast of Peru was directly related to land use change from desert to irrigation for sugar cane and rice, creating suitable new species habitat.
An. pseudopunctipennis has an extensive distribution from the USA to northern Chile and northwestern Argentina, including the Caribbean Lesser Antilles, Trinidad and Tobago and Hispaniola Island[5–8]. Since the original description of this species by Theobald until its redescription by Rueda et al., several studies have attempted to evaluate its taxonomic status[11–15]. Estrada- Franco et al.[8, 13, 14] detected two different geographical populations (Mexican and South American) based on cross-mating experiments and fixed differences at two enzyme loci. Manguin et al. using electrophoretic analyses, reported the presence of three An. pseudopunctipennis populations: one from the southern United States throughout Mexico and Guatemala; another extending from South America through Central America and Belize, both sharing an area of overlap in eastern Guatemala and southern Belize; and a third including only populations from the island of Grenada. Currently, An. pseudopunctipennis is considered to be a complex of at least 2 species. However, there is not much information about demographic processes that could have lead, via allopatry, to speciation.
In Argentina, the historically wide geographical distribution of malaria appears to be reduced to the northwest, where it is still an important endemic parasitic disease[16–18]. Land use changes during the last century lead to a different level of malaria transmission that was indirectly linked to gradual changes in the yungas ecoregion, providing new breeding sites for the vector An. pseudopunctipennis. Until the 40’s, the northern area of the yungas was a preserved rainforest, whereas in the southern area cultivation included sugar cane, citrus and soybean crops. However, after the 40’s, the dynamics in the yungas were altered and the northern area began to exhibit major landscape modifications with severe forest exploitation, recurrent occurrence of fires and the increased pressure of farming that required the presence of workers (a population naïve to malaria) in the area. These environmental alterations indirectly imply climatic changes, and, combined with human migration between southern Bolivia and northwestern Argentina since the second half of the 20th century, could explain the current distribution and abundance of An. pseudopunctipennis mosquitoes and the regional malaria endemicity.
The use of the cytochrome oxidase I gene (COI) for population demographic analyses of Anophelinae species has been well-documented, i.e. Fairley et al.[20, 21] in Anopheles (Nyssorhynchus) aquasalis Curry and Anopheles (Anopheles) punctipennis Say, and Mirabello & Conn and Pedro & Sallum for Anopheles (Nyssorhynchus) darlingi Root, among others. The effects of geographical barriers and latitude can show not only differentiation among populations but also possible barriers to gene flow. For instance, populations of An. darlingi from Central and South America appear to be separate from Amazonia and southern Brazil specimens, with the southern ones considered more ancestral, and barriers to gene flow were also detected along the Amazon River and in southern Brazil.
In the present study, we analyzed the demographic history and population structure of An. pseudopunctipennis from two areas of the yungas ecoregion of Argentina by COI to elucidate the history of this species, as a first attempt to compare populations throughout its range in the Americas.
Collection localities (name and geographical coordinates), number of An. pseudopunctipennis specimens ( N ) and haplotype occurrences and frequencies, in northwestern Argentina
San Roquito – Tartagal (SRT)
Aguas Blancas (AB)
El Oculto (EO)
San Ramón de la Nueva Orán (SRNO)
Rosario de la Frontera (RF)
El Cadillal (EC)
Potrero Las Tablas (PT)
Tucumán Sur (TUCSUR)
Capitán Cáceres (CC)
MJDJ, LO, GQ
La Florida (LF)
MJDJ, LO, GQ
Sargento Moya (SM)
MJDJ, LO, GQ
Collections were made by CDC light traps baited with carbon dioxide in 2005, 2007 and 2008 from 16:00 h-12:00 h in the yungas covering a latitudinal transect of ~550 km. Adult females were identified using the taxonomic key of Wilkerson & Strickman and were deposited in the Instituto-Fundación Miguel Lillo Collection, Argentina (IMLA).
DNA extraction and sequencing
DNA extractions were carried out from whole individual mosquitoes following the standard DNeasy Blood & Tissue Handbook protocol (Qiagen, CA, USA). A 1200 bp fragment of COI gene was amplified by polymerase chain reaction (PCR) using the UEA3 and UEA10 primer pairs. Each PCR reaction was carried out using a Ready-To-Go-PCR Bead (GE Healthcare- Biosciences, NJ, USA) and performed on a PTC-200 thermal cycler (BioRad, Inc.). PCR products were purified with CentriSpin 40 columns (Princeton Separation, NJ, USA) and ExoSAP-IT (USB Corporation, Ohio, USA) and forward and reverse sequencing was performed at the Applied Genomic Technologies Core (Wadsworth Center, New York State Department of Health) on an ABI PRISM 3700 automated DNA sequencer.
Sequences for each individual sample were automatically aligned using Sequencher 3.0 (Gene Codes Corp, MI, USA) and corrected manually. The contig sequences were grouped together and aligned using MEGA version 3.1. In addition, the amino acid sequences were inferred to check for the presence of ambiguous stop codons that could suggest the presence of pseudogenes.
Few specimens were collected from the three most southern localities (10–12; Table 1) and the distances among them (7.45 – 9.9 km) are the lowest for all localities (range is 7.45 - 553.81 km). Therefore, these specimens were treated as a single population, TUCSUR (n = 7), for all analyses.
Phylogenetic relatedness and demographic history
Statistical parsimony networks were constructed to assess relatedness among the An. pseudopunctipennis COI haplotypes using TCS 1.12 software with a 95% connection limit. Genetic variation within populations was assessed by haplotype (h), sequence (K) and nucleotide diversity (π) indices using Arlequin 3.11.
Statistical neutrality tests were performed to detect departures of DNA sequence variability from the expectations of the neutral theory of evolution. Tajima’s D is based on the difference between the estimates of the number of segregating sites and the average number of pairwise differences. The D and F tests proposed by Fu & Li require data from intraspecific molecular polymorphism. Fu’s FS test is based on the haplotype frequency distribution and the R 2 statistic is based on the difference between the number of singletons per sequence and the average number of nucleotide differences. DnaSP v 5 was used for all these calculations.
A mismatch analysis for each partition (north–south) and overall was carried out using Arlequin 3.11. The analysis compares the frequency distribution of pairwise differences between haplotypes with that expected under a model of population expansion[40–42]. To quantify the smoothness of the mismatch distribution, the raggedness (r) statistic was calculated and its significance was assessed using 10,000 replicates.
Population genetic structure and gene flow
Genetic differentiation between populations of An. pseudopunctipennis was estimated by FST using Arlequin 3.11. The FST values were used as distance measures to create a NJ tree by DNAsp 4.50.3. Nei’s GST values were calculated to estimate population differentiation based on differences in allele frequencies and Nei’s Nm, the mean per generation estimate of the absolute number of migrants exchanged among populations. The population structure was evaluated by analysis of molecular variance (AMOVA) in Arlequin 3.11. The hypothesis tested whether the northern and southern yungas represented distinct groups. A spatial analysis of molecular variance (SAMOVA) was performed, which combined genetic differentiation and geographical distance to define groups of geographically homogeneous populations and those with maximum differentiation from each other. In addition, isolation by distance (IBD) was tested using a nonparametric Mantel with the web-based computer program IBDWS v.3.16.
A fragment of 625-bp of the mitochondrial COI gene, from nucleotides 615–1269 was obtained. No stop codons were detected, indicating the mitochondrial origin of the DNA. All COI sequences are available at GenBank under accession numbers KC110039-KC110079. Forty-one haplotypes were identified, seven of which (A, B, H, Q, RR, V and Y) were shared between all northern and southern localities, accounting for 76.9% of the sequences. The dominant haplotype, A, represented 61.21% of the specimens, and was found in all localities (Table 1). Haplotype B was detected in four localities (SRT, AB, FY and RF) from the northern and southern areas. Unique haplotypes were distributed in all the localities.
Haplotypes and nucleotide diversity values and segregating sites of An. pseudopunctipennis in northwestern Argentina
San Roquito- Tartagal
San Ramón de la Nueva Orán
Rosario La Frontera
Potrero Las Tablas
Nei’s G ST and Nm values detected low pairwise genetic differentiation and moderate gene flow between the north and south. The highest value (G ST = 0.14210) was between Potrero Las Tablas (PT) and Vipos (VP), both in the south, separated by 50.5 km. Estimates of gene flow (N m ) varied widely between populations, ranging from 1.51 to 614.50; the lowest was between Potrero Las Tablas (PT) and Vipos (VP) (Nm ~ 1.51). Negative values were related to small population sizes and lack of gene flow[44, 47]. In our study, PT is represented by only four individuals, which might be providing a false inference and misinterpretation of results.
Indices and statistics used to measure An. pseudopunctipennis polymorphisms
San Roquito- Tartagal
San Ramón de la Nueva Orán
Rosario La Frontera
Potrero Las Tablas
To calculate the time of population expansion, t = τ/2 μ was used, where μ is the mutation rate per site per generation[22, 40]. The mutation rate in Drosophila was used: 10-8/site/year and 10 generations/year. The analysis was done for all the samples, since there were no evidence for different populations. The estimate of τ was 0.924 giving an expansion estimated to 7, 392 years ago (95% CI, 32–15, 872), in the Holocene.
The present study shows very little genetic structure of the malaria vector Anopheles pseudopunctipennis in the yungas ecoregion of Argentina based on one mitochondrial marker. Therefore, the hypothesis of genetic differentiation or restriction of gene flow between the northern and southern yungas areas of Argentina is rejected, and there appears to be a single metapopulation in this region of northwestern Argentina. The AMOVA analysis did not reveal significant genetic differentiation when populations were grouped by distinct ecotype, the north and south divisions. Similarly, no boundaries were defined by SAMOVA for the complete data set. Previous findings in An. pseudopunctipennis in North, Central and South America showed deep population structure within this group using other molecular markers[8, 13–15]. Our results suggest that An. pseudopunctipennis from the yungas is a unique population with COI mitochondrial gene flow among localities with similar demographic history. However, to test whether the current degradation of the natural ecosystem and landscape change is affecting the population further studies focused on markers with a faster mutation rate would be desirable[8, 13–15].
When compared to other neotropical malaria vectors, the genetic differentiation between two populations of the malaria vector An. albimanus from Colombia showed similar results; in spite of the deep population structure of the species, low genetic differentiation was observed between Caribbean and Pacific populations that correspond to different biogeographical regions. Loaiza et al. studying An. albimanus populations from southern Central America founded significant genetic structure between populations from Costa Rica and western Panama compared with those from central-eastern Panama, whereas in our study, divergence within groups was shallow and statistically insignificant.
In addition, the low nucleotide diversity and the absence of isolation by distance observed for An. pseudopunctipennis is similar to results obtained for An. darlingi and An. albimanus by Mirabello & Conn, by De Merida et al. and by Molina Cruz et al., linking this to small effective migration rates and effective population size and /or genetic drift. The fact that in An. pseudopunctipennis nucleotide diversity was low, but not haplotype diversity, can be explained by rapid population growth from ancestral populations.
The Nm values between northern and southern populations showed not only high gene flow between them (Nm > 1) but also negative values (Nm <1) related to low gene flow, where significant population differentiation could occur through genetic drift. The more ancestral and diverse haplotypes of An. pseudopunctipennis were observed in both the north and south. As reported by Mirabello & Conn, Molina-Cruz et al. and Kambhampati & Rai, older populations have a higher diversity; this seems to be the case for San Roquito-Tartagal (northern area) and Potrero Las Tablas and Tucumán Sur (southern area). On the basis of the presence of shared haplotypes between northern and southern populations, An. pseudopunctipennis has undergone an extensive expansion population process. In fact, the presence of a dominant haplotype represents an ancestral lineage, because older haplotypes have had more time to spread, leading to a higher frequency and geographic distribution. Furthermore, mismatch distribution for the entire group exhibited a unimodal pattern, suggesting that demographic expansions occurred. Although Pleistocene population expansion has been detected in other Neotropical anophelines, such as An. darlingi (Amazonian region of Brazil)[22, 56], Anopheles marajoara showed a more recent population expansion in Brazil, when it was compared to An. darlingi. This difference may reflect the contraction and re-expansion cycles of Amazonian savanna, which created differences in the availability of habitats for breeding of these two species[58, 59]. Unfortunately, few data from southern Argentina during the Holocene are available, although the Andean glaciations are correlated with the amount of available moisture more than a fall in temperature. Immature stages of An. pseudopunctipennis are commonly found in riverside pools colonized by filamentous algae of the genus Spirogyra in the foothills of the mountainous Mesoamerica region[60–62]. Therefore, one hypothesis that could be tested is that climatic oscillations during the Pleistocene together with modifications in vegetation could favor the presence of breeding sites for this species during the Holocene.
The development of alternative breeding sites, or the increase of new suitable breeding sites because of the anthropic alterations of natural habitats, such as development of crops, may be a concern due to the possibility of colonization of new areas where the vector (or new vectors) was absent before. Thus, malaria vector surveillance should be included in the strategies of disease control in the area.
This is the first report of the use of the mitochondrial COI gene to study the population demography of An. pseudopunctipennis in America, although the study was restricted to the Argentinian distribution. Results do not support the existence of northern and southern An. pseudopunctipennis population differentiation. Instead, this metapopulation seems to have undergone a single colonization process, without differentiation between northern and southern localities, with fairly high gene flow among them and evidence of a Holocene expansion.
In summary, this research reports the pattern of the genetic variability and gene flow among northwestern Argentinian localities of An. pseudopunctipennis. This study provides important baseline data that suggest that similar vector control measures should work in both the north and south, and also, if insecticide resistance evolves, it would likely spread fairly rapidly in this area.
We want to thank Federico Vianconi, Neri Vianconi, Enrique Laci and Juan Carlos Hitzamatzu (Coordinación Nacional de Control de Vectores, Ministerio de Salud de Argentina) for their invaluable help in the mosquito collections. We also thank María Gabriela Rangel and Camila Hernández (Laboratorio de Biología de Vectores, Instituto de Zoología Tropical, Universidad Central de Venezuela) for their collaboration in the first molecular studies. We appreciate the comments and help of PhD Lina Gutiérrez Builes and PhD José Loaiza about the manuscript.
This work was supported by Grants (PICT 01–04347; PICT 02–12605) from Agencia Nacional de Promoción Científica y Tecnológica (FONCyT), Consejo Nacional de Investigaciones Científicas Técnicas (CONICET), Consejo de Investigaciones de la Universidad Nacional de Tucumán (CIUNT), Coordinación Nacional de Control de Vectores (Ministerio de Salud de la Nación), National Institutes of Health (USA) grant R01 AI54139 to JEC and by the Fulbright-Bunge & Born grant to MJDJ.
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