Genetic variability of Panstrongylus geniculatus (Reduviidae: Triatominae) in the Metropolitan District of Caracas, Venezuela.
Panstrongylus geniculatus has become the most frequently registered vector of Chagas disease in the metropolitan area of Caracas, Venezuela. This triatomine species has invaded urban areas in recent years and has been implicated in multiple oral outbreaks of Chagas disease in the region. The study of genetic variability and spatial structure in P. geniculatus populations can provide information about possible events of domiciliation and aid intervention programs against triatomine species rapidly adapting to urban ecotopes. We sequenced a region of the cytochrome-b gene in 114 specimens of P. geniculatus from the Metropolitan District of Caracas and assessed patterns of gene flow and phylogenetic relationships among these individuals. A total of 29 haplotypes were detected in the two sampled municipalities, Sucre and Libertador. Though high genetic connectivity was observed between the municipalities (FST = 0.10796; Nm = 11.20), subtle genetic structuring was also observed in particular geographic sub regions. Based on neutrality tests and the observed allele-frequency distribution, the Panstrongylus geniculatus population appears to be expanding and adapting to different microhabitats present in the study area. Our findings affirm the capacity of this insect to adapt to different environments and emphasize its principal role in the epidemiology of Chagas disease in northern Venezuela.
['Nakad Bechara|Candy C|CC|', 'Londoño|Juan Carlos|JC|', 'Segovia|Maikell|M|', 'Leon Sanchez|Meyber A|MA|', 'Martínez P|Clara E|CE|', 'Rodríguez R|Marlenes M|MM|', 'Carrasco|Hernan Jose|HJ|']
D000818:Animals D014355:Chagas Disease D017344:Genes, Insect D050259:Genes, Mitochondrial D014644:Genetic Variation D005828:Genetics, Population D062306:Geography, Medical D006239:Haplotypes D006801:Humans D007303:Insect Vectors D009500:Neutralization Tests D010203:Panstrongylus D010802:Phylogeny D014687:Venezuela
Genetic variability Caracas P. geniculatus Cytochrome-b Haplotype network Phylogeny