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INFERRING FROM THE CYT B GENE THE TRIATOMA BRASILIENSIS NEIVA, 1911 (HEMIPTERA: REDUVIIDAE: TRIATOMINAE) GENETIC STRUCTURE AND DOMICILIARY INFESTATION IN THE STATE OF PARAÍBA, BRAZIL
Author
Affilliation
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Rio de Janeiro, RJ. Brasil.
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Rio de Janeiro, RJ. Brasil.
Universidade Federal do Rio Grande do Sul. Departamento de Genética. Porto Alegre, RS, Brasil.
Pontificia Universidad Católica del Ecuador. Departamento de Biología. Laboratorio de Entomología. Institut de Recherche pour le Développement. Quito, Ecuador.
Division of Parasitic Diseases. Centers for Disease Control and Prevention, NCID. GA, USA.
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Rio de Janeiro, RJ. Brasil.
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Rio de Janeiro, RJ. Brasil.
Universidade Federal do Rio Grande do Sul. Departamento de Genética. Porto Alegre, RS, Brasil.
Pontificia Universidad Católica del Ecuador. Departamento de Biología. Laboratorio de Entomología. Institut de Recherche pour le Développement. Quito, Ecuador.
Division of Parasitic Diseases. Centers for Disease Control and Prevention, NCID. GA, USA.
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Rio de Janeiro, RJ. Brasil.
Abstract
The Triatoma brasiliensis genetic structure was analyzed using the Cyt B gene in different geographic
locations and ecotopes after a short and long period after insecticide treatment. Four different localities (16–40 km apart)
in the state of Paraíba, Brazil, were sampled. Analysis of molecular variance (AMOVA) showed that grouping populations
according to the geographic location or ecotope resulted in a higher variance among populations within groups
( SC ranging from 0.15 to 0.17) than among groups ( CT ranging from 0.04 to 0.07). The percentage of variation was
reduced among populations within groups and increased among groups ( SC 0.08, CT 0.16) by grouping 1) the
domiciliary populations from each village and 2) all wild populations. These data indicated that T. brasiliensis is
genetically structured both ecologically and at a smaller geographic scale for domiciliary populations. Re-infestations
after insecticide treatment were composed of distinct populations, pointing to variable population sources for domiciliary
infestations.
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