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Ferreira FC, Gonçalves LO, Ruiz JC, Koerich LB, Pais FSM, Diotaiuti LG, Belisário CJ. Identification and characterization of microsatellite markers for population genetic studies of Panstrongylus megistus (Burmeister, 1835) (Triatominae: Reduviidae). Parasit Vectors 2021; 14:273. [PMID: 34022931 PMCID: PMC8140489 DOI: 10.1186/s13071-021-04771-w] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2020] [Accepted: 05/03/2021] [Indexed: 11/19/2022] Open
Abstract
Background Panstrongylus megistus is the most important vector of Chagas disease in Brazil. Studies show that the principal factor hindering the control of triatomines is reinfestation of houses previously treated with insecticides. Studies at the microgeographic level are therefore necessary to better understand these events. However, an efficient molecular marker is not yet available for carrying out such analyses in this species. The aim of the present study was to identify and characterize microsatellite loci for future population genetic studies of P. megistus. Methods This study work consisted of five stages: (i) sequencing of genomic DNA; (ii) assembly and selection of contigs containing microsatellites; (iii) validation of amplification and evaluation of polymorphic loci; (iv) standardization of the polymorphic loci; and (v) verification of cross-amplification with other triatomine species. Results Sequencing of males and females generated 7,908,463 contigs with a total length of 2,043,422,613 bp. A total of 2,043,690 regions with microsatellites in 1,441,091 contigs were obtained, with mononucleotide repeats being the most abundant class. From a panel of 96 loci it was possible to visualize polymorphisms in 64.55% of the loci. Of the 20 loci genotyped, the number of alleles varied from two to nine with an average of 4.9. Cross-amplification with other species of triatomines was observed in 13 of the loci. Conclusions Due to the high number of alleles encountered, polymorphism and the capacity to amplify from geographically distant populations, the microsatellites described here show promise for utilization in population genetic studies of P. megistus. Graphic abstract ![]()
Supplementary Information The online version contains supplementary material available at 10.1186/s13071-021-04771-w.
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Affiliation(s)
| | | | | | - Leonardo Barbosa Koerich
- Laboratory of Hematophagous Insect Physiology, Institute of Biological Sciences, Federal University of Minas Gerais, Belo Horizonte, Brazil
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Bezerra CM, Belisário CJ, D'Ávilla Pessoa GC, Rosa ACL, Barezani CP, Ferreira FC, Ramos AN, Gürtler RE, Diotaiuti L. Microsatellite variation revealed panmictic pattern for Triatoma brasiliensis (Triatominae: Reduviidae) in rural northeastern Brazil: the control measures implications. BMC Genet 2020; 21:92. [PMID: 32854614 PMCID: PMC7457261 DOI: 10.1186/s12863-020-00903-w] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2020] [Accepted: 08/17/2020] [Indexed: 01/01/2023] Open
Abstract
Background Triatoma brasiliensis Neiva, 1911 is the main vector of Trypanosoma cruzi in the caatinga of Northeastern Brazil. Despite of its epidemiological relevance, there are few studies on its genetic variability. Using microsatellite markers, we characterized the variability and dynamics of infestation and reinfestation of T. brasiliensis after residual insecticide spraying in five surveys conducted in a well-defined rural area located in the municipality of Tauá, Ceará, between 2009 and 2015. We evaluated: (1) general variability among local of captures; (2) variability along the time analysis (2009, 2010 and 2015); (3) and reinfestation process. Results On the analysis (1) global and pairwise FST values suggested absence of clusters among the area. AMOVA indicated that total variation is mainly represented by individual differences. Absence of clustering indicates a panmitic unit, with free gene flow. For (2), Pairwise FST indicated alterations in the genetic profile of the triatomines along the time. (3) Analysis of the reinfestation process showed that the domiciliary units investigated had different sources of infestation despite of its proximity. Conclusions Observed homogeneity can be explained by the great dispersal capacity of T. brasiliensis, overlapping the different environments. Persistent house infestation in Tauá may be attributed to the occurrence of postspraying residual foci and the invasion of triatomines from their natural habitats.
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Affiliation(s)
- Claudia Mendonça Bezerra
- Departamento de Saúde Comunitária. Rua Professor Costa Mendes 1608 - Bloco Didático 5° andar - Rodolfo Teófilo, Universidade Federal do Ceará, Faculdade de Medicina, Fortaleza, Ceará, CEP: 60430-140, Brazil. .,Secretaria da Saúde do Estado do Ceará, Fortaleza, CE, Brazil.
| | - Carlota Josefovicz Belisário
- Grupo de Pesquisa em Triatomíneos e Epidemiologia da Doença de Chagas, Instituto René Rachou / FIOCRUZ - MG, Belo Horizonte, MG, Brazil
| | | | - Aline Cristine Luiz Rosa
- Grupo de Pesquisa em Triatomíneos e Epidemiologia da Doença de Chagas, Instituto René Rachou / FIOCRUZ - MG, Belo Horizonte, MG, Brazil
| | - Carla Patrícia Barezani
- Grupo de Pesquisa em Triatomíneos e Epidemiologia da Doença de Chagas, Instituto René Rachou / FIOCRUZ - MG, Belo Horizonte, MG, Brazil
| | - Flávio Campos Ferreira
- Grupo de Pesquisa em Triatomíneos e Epidemiologia da Doença de Chagas, Instituto René Rachou / FIOCRUZ - MG, Belo Horizonte, MG, Brazil
| | - Alberto Novaes Ramos
- Departamento de Saúde Comunitária. Rua Professor Costa Mendes 1608 - Bloco Didático 5° andar - Rodolfo Teófilo, Universidade Federal do Ceará, Faculdade de Medicina, Fortaleza, Ceará, CEP: 60430-140, Brazil
| | - Ricardo Esteban Gürtler
- Laboratory of Eco-Epidemiology, Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales, Ciudad Universitaria, C1428EHA, Buenos Aires, Argentina.,Instituto de Ecología, Genética y Evolución de Buenos Aires (IEGEBA). Consejo Nacional de Investigaciones Científicas y Técnicas-Universidad de Buenos Aires, Ciudad Universitaria, C1428EHA, Buenos Aires, Argentina
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Monteiro FA, Weirauch C, Felix M, Lazoski C, Abad-Franch F. Evolution, Systematics, and Biogeography of the Triatominae, Vectors of Chagas Disease. ADVANCES IN PARASITOLOGY 2019. [PMID: 29530308 DOI: 10.1016/bs.apar.2017.12.002] [Citation(s) in RCA: 89] [Impact Index Per Article: 17.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
In this chapter, we review and update current knowledge about the evolution, systematics, and biogeography of the Triatominae (Hemiptera: Reduviidae)-true bugs that feed primarily on vertebrate blood. In the Americas, triatomines are the vectors of Trypanosoma cruzi, the etiological agent of Chagas disease. Despite declining incidence and prevalence, Chagas disease is still a major public health concern in Latin America. Triatomines occur also in the Old World, where vector-borne T. cruzi transmission has not been recorded. Triatomines evolved from predatory reduviid bugs, most likely in the New World, and diversified extensively across the Americas (including the Caribbean) and in parts of Asia and Oceania. Here, we first discuss our current understanding of how, how many times, and when the blood-feeding habit might have evolved among the Reduviidae. Then we present a summary of recent advances in the systematics of this diverse group of insects, with an emphasis on the contribution of molecular tools to the clarification of taxonomic controversies. Finally, and in the light of both up-to-date phylogenetic hypotheses and a thorough review of distribution records, we propose a global synthesis of the biogeography of the Triatominae. Over 130 triatomine species contribute to maintaining T. cruzi transmission among mammals (sometimes including humans) in almost every terrestrial ecoregion of the Americas. This means that Chagas disease will never be eradicated and underscores the fact that effective disease prevention will perforce require stronger, long-term vector control-surveillance systems.
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Affiliation(s)
- Fernando Araujo Monteiro
- Laboratório de Epidemiologia e Sistemática Molecular, Instituto Oswaldo Cruz, FIOCRUZ, Rio de Janeiro, Brazil.
| | | | - Márcio Felix
- Laboratório de Biodiversidade Entomológica, Instituto Oswaldo Cruz, FIOCRUZ, Rio de Janeiro, Brazil
| | - Cristiano Lazoski
- Instituto de Biologia, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
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Peretolchina T, Pavan MG, Corrêa-Antônio J, Gurgel-Gonçalves R, Lima MM, Monteiro FA. Phylogeography and demographic history of the Chagas disease vector Rhodnius nasutus (Hemiptera: Reduviidae) in the Brazilian Caatinga biome. PLoS Negl Trop Dis 2018; 12:e0006731. [PMID: 30248092 PMCID: PMC6195287 DOI: 10.1371/journal.pntd.0006731] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/01/2018] [Revised: 10/19/2018] [Accepted: 08/03/2018] [Indexed: 11/18/2022] Open
Abstract
BACKGROUND Rhodnius nasutus, a vector of the etiological agent Trypanosoma cruzi, is one of the epidemiologically most relevant triatomine species of the Brazilian Caatinga, where it often colonizes rural peridomestic structures such as chicken coops and occasionally invades houses. Historical colonization and determination of its genetic diversity and population structure may provide new information towards the improvement of vector control in the region. In this paper we present thoughtful analyses considering the phylogeography and demographic history of R. nasutus in the Caatinga. METHODOLOGY/PRINCIPAL FINDINGS A total of 157 R. nasutus specimens were collected from Copernicia prunifera palm trees in eight geographic localities within the Brazilian Caatinga biome, sequenced for 595-bp fragment of the mitochondrial cytochrome b gene (cyt b) and genotyped for eight microsatellite loci. Sixteen haplotypes were detected in the cyt b sequences, two of which were shared among different localities. Molecular diversity indices exhibited low diversity levels and a haplotype network revealed low divergence among R. nasutus sequences, with two central haplotypes shared by five of the eight populations analyzed. The demographic model that better represented R. nasutus population dynamics was the exponential growth model. Results of the microsatellite data analyses indicated that the entire population is comprised of four highly differentiated groups, with no obvious contemporary geographic barriers that could explain the population substructure detected. A complex pattern of migration was observed, in which a western Caatinga population seems to be the source of emigrants to the eastern populations. CONCLUSIONS/SIGNIFICANCE R. nasutus that inhabit C. prunifera palms do not comprise a species complex. The species went through a population expansion at 12-10 ka, during the Holocene, which coincides with end of the largest dry season in South America. It colonized the Caatinga in a process that occurred from west to east in the region. R. nasutus is presently facing an important ecological impact caused by the continuous deforestation of C. prunifera palms in northeast Brazil. We hypothesize that this ecological disturbance might contribute to an increase in the events of invasion and colonization of human habitations.
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Affiliation(s)
- Tatiana Peretolchina
- Laboratório de Epidemiologia e Sistemática Molecular, Instituto Oswaldo Cruz, Fiocruz, Rio de Janeiro, Brazil
- Laboratory of Molecular Systematics, Limnological Institute of the Siberian Branch of the Russian Academy of Sciences, Irkutsk, Russia
| | - Márcio G. Pavan
- Laboratório de Epidemiologia e Sistemática Molecular, Instituto Oswaldo Cruz, Fiocruz, Rio de Janeiro, Brazil
- Laboratório de Mosquitos Transmissores de Hematozoários, Instituto Oswaldo Cruz, Fiocruz, Rio de Janeiro, Brazil
| | - Jessica Corrêa-Antônio
- Laboratório de Epidemiologia e Sistemática Molecular, Instituto Oswaldo Cruz, Fiocruz, Rio de Janeiro, Brazil
| | - Rodrigo Gurgel-Gonçalves
- Laboratório de Parasitologia Médica e Biologia de Vetores, Faculdade de Medicina, Universidade de Brasília, Brasília, Distrito Federal, Brazil
| | - Marli M. Lima
- Laboratório de Ecoepidemiologia da doença de Chagas, Instituto Oswaldo Cruz, Fiocruz, Rio de Janeiro, RJ, Brazil
| | - Fernando A. Monteiro
- Laboratório de Epidemiologia e Sistemática Molecular, Instituto Oswaldo Cruz, Fiocruz, Rio de Janeiro, Brazil
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Villacís AG, Marcet PL, Yumiseva CA, Dotson EM, Tibayrenc M, Brenière SF, Grijalva MJ. Pioneer study of population genetics of Rhodnius ecuadoriensis (Hemiptera: Reduviidae) from the central coastand southern Andean regions of Ecuador. INFECTION GENETICS AND EVOLUTION 2017; 53:116-127. [PMID: 28546079 DOI: 10.1016/j.meegid.2017.05.019] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/13/2017] [Revised: 05/19/2017] [Accepted: 05/20/2017] [Indexed: 10/19/2022]
Abstract
Effective control of Chagas disease vector populations requires a good understanding of the epidemiological components, including a reliable analysis of the genetic structure of vector populations. Rhodnius ecuadoriensis is the most widespread vector of Chagas disease in Ecuador, occupying domestic, peridomestic and sylvatic habitats. It is widely distributed in the central coast and southern highlands regions of Ecuador, two very different regions in terms of bio-geographical characteristics. To evaluate the genetic relationship among R. ecuadoriensis populations in these two regions, we analyzed genetic variability at two microsatellite loci for 326 specimens (n=122 in Manabí and n=204 in Loja) and the mitochondrial cytochrome b gene (Cyt b) sequences for 174 individuals collected in the two provinces (n=73 and=101 in Manabí and Loja respectively). The individual samples were grouped in populations according to their community of origin. A few populations presented positive FIS, possible due to Wahlund effect. Significant pairwise differentiation was detected between populations within each province for both genetic markers, and the isolation by distance model was significant for these populations. Microsatellite markers showed significant genetic differentiation between the populations of the two provinces. The partial sequences of the Cyt b gene (578bp) identified a total of 34 haplotypes among 174 specimens sequenced, which translated into high haplotype diversity (Hd=0.929). The haplotype distribution differed among provinces (significant Fisher's exact test). Overall, the genetic differentiation of R. ecuadoriensis between provinces detected in this study is consistent with the biological and phenotypic differences previously observed between Manabí and Loja populations. The current phylogenetic analysis evidenced the monophyly of the populations of R. ecuadoriensis within the R. pallescens species complex; R. pallescens and R. colombiensis were more closely related than they were to R. ecuadoriensis.
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Affiliation(s)
- Anita G Villacís
- Center for Research on Health in Latin America (CISeAL), School of Biological Sciences, Pontifical Catholic University of Ecuador, Quito, Ecuador
| | - Paula L Marcet
- Centers for Disease Control and Prevention, Division of Parasitic Diseases and Malaria, Entomology Branch, 1600 Clifton Rd., Atlanta, GA 30329, USA
| | - César A Yumiseva
- Center for Research on Health in Latin America (CISeAL), School of Biological Sciences, Pontifical Catholic University of Ecuador, Quito, Ecuador
| | - Ellen M Dotson
- Centers for Disease Control and Prevention, Division of Parasitic Diseases and Malaria, Entomology Branch, 1600 Clifton Rd., Atlanta, GA 30329, USA
| | - Michel Tibayrenc
- IRD, UMR MIVEGEC (IRD 224-CNRS 5290-UM1-UM2), Maladies Infectieuses et Vecteurs Ecologie, Génétique, Evolution et Contrôle, IRD Center, 911, avenue Agropolis, Montpellier, France
| | - Simone Frédérique Brenière
- Center for Research on Health in Latin America (CISeAL), School of Biological Sciences, Pontifical Catholic University of Ecuador, Quito, Ecuador; IRD, UMR INTERTRYP (IRD-CIRAD), Interactions hosts-vectors-parasites-environment in the tropical neglected disease due to trypanosomatids, TA A-17/G, Campus international de Baillarguet, Montpellier, France
| | - Mario J Grijalva
- Center for Research on Health in Latin America (CISeAL), School of Biological Sciences, Pontifical Catholic University of Ecuador, Quito, Ecuador; Infectious and Tropical Disease Institute, Heritage College of Osteopathic Medicine, Ohio University, Irvine Hall, Athens, OH 45701, United States.
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Genetic characterization of residual Triatoma infestans populations from Brazil by microsatellite. Genetica 2017; 145:105-114. [PMID: 28120213 DOI: 10.1007/s10709-017-9949-y] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2016] [Accepted: 01/06/2017] [Indexed: 10/20/2022]
Abstract
In spite of long-term efforts to eliminate Triatoma infestans (Klug 1834) from Brazil, residual foci still persist in the states of Bahia and Rio Grande do Sul. Data on the genetic variability and structuring of these populations are however lacking. Using nine microsatellite loci, we characterized one residual T. infestans population from Bahia and four from Rio Grande do Sul, and compared them with bugs originally from an older focus in São Paulo; 224 bugs were genotyped. The number of alleles per locus ranged from 5 to 11. Observed and expected heterozygosities per locus ranged, respectively, from 0 to 0.786 and from 0 to 0.764. Significant departures from Hardy-Weinberg equilibrium, mainly due to heterozygote deficits, were detected in all loci and in most populations. Global indices estimated by AMOVA were: Fis was 0.37; Fst was 0.28; and Fit was 0.55; overall indices with p = 0.00 indicated substantial differentiation. Inter-population Fst ranged from 0.118 to 0.562, suggesting strong genetic structuring and little to no gene flow among populations. Intra-population Fis ranged from 0.301 to 0.307. Inbreeding was apparent in all populations except that from Bahia-which might be either linked by gene flow to nearby unsampled populations or part of a relatively large local population. The overall pattern of strong genetic structuring among pyrethroid-susceptible residual T. infestans populations suggests that their persistence is probably due to operational control failures. Detection and elimination of such residual foci is technically feasible and must become a public health priority in Brazil.
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Justi SA, Galvão C. The Evolutionary Origin of Diversity in Chagas Disease Vectors. Trends Parasitol 2017; 33:42-52. [PMID: 27986547 PMCID: PMC5518462 DOI: 10.1016/j.pt.2016.11.002] [Citation(s) in RCA: 97] [Impact Index Per Article: 13.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2016] [Revised: 11/01/2016] [Accepted: 11/04/2016] [Indexed: 11/16/2022]
Abstract
Chagas disease is amongst the ten most important neglected tropical diseases but knowledge on the diversification of its vectors, Triatominae (Hemiptera: Reduviidae), is very scarce. Most Triatominae species occur in the Americas, and are all considered potential vectors. Despite its amazing ecological vignette, there are remarkably few evolutionary studies of the whole subfamily, and only one genome sequence has been published. The young age of the subfamily, coupled with the high number of independent lineages, are intriguing, yet the lack of genome-wide data makes it a challenge to infer the phylogenetic relationships within Triatominae. Here we synthesize what is known, and suggest the next steps towards a better understanding of how this important group of disease vectors came to be.
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Affiliation(s)
- Silvia A Justi
- Department of Biology, College of Arts and Sciences, University of Vermont, Burlington, VT, USA
| | - Cleber Galvão
- Laboratório Nacional e Internacional de Referência em Taxonomia de Triatomíneos, Instituto Oswaldo Cruz, FIOCRUZ, Rio de Janeiro, Brazil.
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Belisário CJ, Pessoa GCD, dos Santos PF, Dias LS, Rosa ACL, Diotaiuti L. Markers for the population genetics studies of Triatoma sordida (Hemiptera: Reduviidae). Parasit Vectors 2015; 8:269. [PMID: 25963633 PMCID: PMC4435924 DOI: 10.1186/s13071-015-0879-1] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2014] [Accepted: 05/01/2015] [Indexed: 11/17/2022] Open
Abstract
Background Triatoma sordida, a vector of Trypanosoma cruzi, is native of Brazil, Bolivia, Paraguay, Argentina, and Uruguay, and occurs primarily in peridomiciles. Currently, it is the species most frequently captured by the Chagas Disease Control Program in Brazil. For this reason, population genetic studies attract great interest, as they can provide further information about the dispersal and household invasion processes of this species. In the absence of suitable markers, the objective of this study was to test the cross amplification of microsatellite primers. Findings 23 primers were tested for microsatellite loci already described for other species of the genus Triatoma sp. Forty four specimens of T. sordida captured in the north of Minas Gerais were used to validate the use of standardized loci for population genetic analyses. It was possible to amplify 10 of the 23 loci tested for T. sordida. Conclusions This is the first study that provides 10 microsatellite markers for population analysis of this triatomine species. Cross-amplification of primers can be used among other phylogenetically related species whose loci are already available for study.
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Affiliation(s)
- Carlota Josefovicz Belisário
- Laboratório de Triatomíneos e Epidemiologia da Doença de Chagas, Centro de Pesquisas René Rachou, Avenida Augusto de Lima, 1715 Barro Preto, CEP 30.190-002, Belo Horizonte, Minas Gerais, Brazil.
| | - Grasielle Caldas D'Ávila Pessoa
- Laboratório de Triatomíneos e Epidemiologia da Doença de Chagas, Centro de Pesquisas René Rachou, Avenida Augusto de Lima, 1715 Barro Preto, CEP 30.190-002, Belo Horizonte, Minas Gerais, Brazil.
| | - Paula Fernandes dos Santos
- Laboratório de Triatomíneos e Epidemiologia da Doença de Chagas, Centro de Pesquisas René Rachou, Avenida Augusto de Lima, 1715 Barro Preto, CEP 30.190-002, Belo Horizonte, Minas Gerais, Brazil.
| | - Letícia Sena Dias
- Laboratório de Triatomíneos e Epidemiologia da Doença de Chagas, Centro de Pesquisas René Rachou, Avenida Augusto de Lima, 1715 Barro Preto, CEP 30.190-002, Belo Horizonte, Minas Gerais, Brazil.
| | - Aline Cristine Luiz Rosa
- Laboratório de Triatomíneos e Epidemiologia da Doença de Chagas, Centro de Pesquisas René Rachou, Avenida Augusto de Lima, 1715 Barro Preto, CEP 30.190-002, Belo Horizonte, Minas Gerais, Brazil.
| | - Liléia Diotaiuti
- Laboratório de Triatomíneos e Epidemiologia da Doença de Chagas, Centro de Pesquisas René Rachou, Avenida Augusto de Lima, 1715 Barro Preto, CEP 30.190-002, Belo Horizonte, Minas Gerais, Brazil.
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Gómez-Palacio A, Triana O, Jaramillo-O N, Dotson EM, Marcet PL. Eco-geographical differentiation among Colombian populations of the Chagas disease vector Triatoma dimidiata (Hemiptera: Reduviidae). INFECTION GENETICS AND EVOLUTION 2013; 20:352-61. [PMID: 24035810 DOI: 10.1016/j.meegid.2013.09.003] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/30/2013] [Revised: 08/22/2013] [Accepted: 09/02/2013] [Indexed: 11/17/2022]
Abstract
Triatoma dimidiata is currently the main vector of Chagas disease in Mexico, most Central American countries and several zones of Ecuador and Colombia. Although this species has been the subject of several recent phylogeographic studies, the relationship among different populations within the species remains unclear. To elucidate the population genetic structure of T. dimidiata in Colombia, we analyzed individuals from distinct geographical locations using the cytochrome c oxidase subunit 1 gene and 7 microsatellite loci. A clear genetic differentiation was observed among specimens from three Colombian eco-geographical regions: Inter Andean Valleys, Caribbean Plains and Sierra Nevada de Santa Marta mountain (SNSM). Additionally, evidence of genetic subdivision was found within the Caribbean Plains region as well as moderate gene flow between the populations from the Caribbean Plains and SNSM regions. The genetic differentiation found among Colombian populations correlates, albeit weakly, with an isolation-by-distance model (IBD). The genetic heterogeneity among Colombian populations correlates with the eco-epidemiological and morphological traits observed in this species across regions within the country. Such genetic and epidemiological diversity should be taken into consideration for the development of vector control strategies and entomological surveillance.
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Affiliation(s)
- Andrés Gómez-Palacio
- Grupo BCEI, Universidad de Antioquia UdeA, Calle 70 No. 52-21, Medellin, Colombia.
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Dias FBS, Paula ASD, Belisário CJ, Lorenzo MG, Bezerra CM, Harry M, Diotaiuti L. Influence of the palm tree species on the variability of Rhodnius nasutus Stål, 1859 (Hemiptera, Reduviidae, Triatominae). INFECTION GENETICS AND EVOLUTION 2011; 11:869-77. [PMID: 21335104 DOI: 10.1016/j.meegid.2011.02.008] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/24/2010] [Revised: 01/31/2011] [Accepted: 02/08/2011] [Indexed: 11/25/2022]
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Fé NF, França MS, Carvalho-Costa FA. Reassessing the entomological investigation around the first autochthonous case of Chagas disease in Western Brazilian Amazon. Mem Inst Oswaldo Cruz 2009; 104:121-3. [DOI: 10.1590/s0074-02762009000100019] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2008] [Accepted: 06/01/2009] [Indexed: 11/21/2022] Open
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A panel of ten microsatellite loci for the Chagas disease vector Rhodnius prolixus (Hemiptera: Reduviidae). INFECTION GENETICS AND EVOLUTION 2008; 9:206-9. [PMID: 19061974 PMCID: PMC2651431 DOI: 10.1016/j.meegid.2008.10.017] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/18/2008] [Revised: 10/28/2008] [Accepted: 10/28/2008] [Indexed: 11/29/2022]
Abstract
Rhodnius prolixus is the main vector of Chagas disease in Venezuela, where it is found colonising rural housing consisting of unplastered adobe walls with palm and/or metal roofs. Vector control failure in Venezuela may be due to the invasion of houses by silvatic populations of R. prolixus found in palms. As part of a study to determine if domestic and silvatic populations of R. prolixus are isolated, thus clarifying the role of silvatic populations in maintaining house infestations, we constructed three partial genomic microsatellite libraries. A panel of ten dinucleotide polymorphic microsatellite markers was selected for genotyping. Allele numbers per locus ranged from three to twelve, with observed and expected heterozygosity ranging from 0.26 to 0.55 and 0.32 to 0.66. The microsatellite markers presented here will contribute to the control of Chagas disease in Venezuela and Colombia through the provision of population information that may allow the design of improved control strategies.
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Genetic structure of Triatoma infestans populations in rural communities of Santiago del Estero, northern Argentina. INFECTION GENETICS AND EVOLUTION 2008; 8:835-46. [PMID: 18773972 DOI: 10.1016/j.meegid.2008.08.002] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/08/2007] [Revised: 08/05/2008] [Accepted: 08/07/2008] [Indexed: 11/22/2022]
Abstract
To gain an understanding of the genetic structure and dispersal dynamics of Triatoma infestans populations, we analyzed the multilocus genotype of 10 microsatellite loci for 352 T. infestans collected in 21 houses of 11 rural communities in October 2002. Genetic structure was analyzed at the community and house compound levels. Analysis revealed that vector control actions affected the genetic structure of T. infestans populations. Bug populations from communities under sustained vector control (core area) were highly structured and genetic differentiation between neighboring house compounds was significant. In contrast, bug populations from communities with sporadic vector control actions were more homogeneous and lacked defined genetic clusters. Genetic differentiation between population pairs did not fit a model of isolation by distance at the microgeographical level. Evidence consistent with flight or walking bug dispersal was detected within and among communities, dispersal was more female-biased in the core area and results suggested that houses received immigrants from more than one source. Putative sources and mechanisms of re-infestation are described. These data may be use to design improved vector control strategies.
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Harry M, Dupont L, Romana C, Demanche C, Mercier A, Livet A, Diotaiuti L, Noireau F, Emperaire L. Microsatellite markers in Triatoma pseudomaculata (Hemiptera, Reduviidae, Triatominae), Chagas' disease vector in Brazil. INFECTION GENETICS AND EVOLUTION 2008; 8:672-5. [PMID: 18571993 DOI: 10.1016/j.meegid.2008.03.005] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/28/2008] [Revised: 03/26/2008] [Accepted: 03/27/2008] [Indexed: 10/22/2022]
Abstract
Six polymorphic microsatellite loci were isolated and characterized using a microsatellite-enriched genomic library from the Chagas' disease vector Triatoma pseudomaculata. This species is found in Brasil in Caatinga areas and predominantly in peridomestic habitats. All the microsatellites tested on a population of T. pseudomaculata sampled in the Bahia State, Brazil, were polymorphic (2-15 alleles). Markers amplification was also tested on six Triatoma species and some loci successfully amplified in the most phylogenetically related species, in particular Triatoma brasiliensis.
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Affiliation(s)
- M Harry
- UMR 137, UFR de Sciences, Université Paris 12, Av du général De Gaulle, 94 000 Créteil, France.
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