Parasitology Research

, Volume 106, Issue 4, pp 895–905 | Cite as

Molecular evidence of intraspecific variability in different habitat-related populations of Triatoma dimidiata (Hemiptera: Reduviidae) from Costa Rica

  • Melissa Blandón-Naranjo
  • María Ángeles Zuriaga
  • Gabriela Azofeifa
  • Rodrigo Zeledón
  • María Dolores Bargues
Original Paper


Intraspecific genetic variation among Triatoma dimidiata (Hemiptera: Reduviidae) from seven Costa Rican populations and from different domestic, peridomestic, and sylvatic ecotopes were analyzed. The complete nucleotide sequence of the nuclear ribosomal DNA internal transcribed spacer (ITS-2) and partial sequences of the cytochrome B (Cyt b) gene and the large ribosomal subunit RNA (16S) of mitochondrial DNA (mtDNA) were analyzed and compared. All ITS-2 sequences analyzed were identical and correspond to the haplotype T.dim-H1, the most common haplotype in Central American populations. Sequences of mtDNA revealed a 10.17% of polymorphism in Cyt b and 2.39% in 16S, suggesting that the Cyt b fragment is a useful marker to describe the genetic structure of populations, even at habitat-related level. The analyses of the 18 new combined T. dimidiata haplotypes (Cytb/16S/ITS-2) showed that the two main geographical locations and populations studied are genetically structured showing different haplotype profiling. Only one combined haplotype was shared in the studied areas (Cytb.d/16S.a). Seven haplotypes exclusive for domestic/peridomestic populations, five for sylvatic, and six shared haplotypes for both habitat-related ecotopes are described. Although the relationship between the habitat and the haplotype profiling is less clear, there are different patterns of haplotype distribution in each geographic area between the two habitat-related ecotopes studied (domestic/peridomestic and sylvatic), some of them reflected in the phylogenetic relationships analyzed. The intraspecific variability detected may underlie the known plasticity of T. dimidiata, an important vector for Chagas disease transmission, suggesting that this species must be continuously monitored.


Intraspecific Variability Combine Haplotype Costa Rican Population Haplotype Profile Central American Population 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.



This study was supported by projects “Chagas Disease Intervention Activities” (CDIA, Contract No. ICA4CT-2003-10049) of the European Commission and the Red de Investigación de Centros de Enfermedades Tropicales - RICET (Projects No. C03/04, No. PI030545 and No. RD06/0021/0017 of the Program of Redes Temáticas de Investigació Cooperativa), FIS, Spanish Ministry of Health, Madrid, Spain. The help of Dr. EM Dotson from CDC, Atlanta, Georgia, USA, for mtDNA sequencing is acknowledged. Technical support was provided by the Servicio Central de Secuenciación para la Investigación Experimental (SCSIE) of the Universidad de Valencia (Dr. A. Martínez).


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Copyright information

© Springer-Verlag 2010

Authors and Affiliations

  • Melissa Blandón-Naranjo
    • 1
  • María Ángeles Zuriaga
    • 2
  • Gabriela Azofeifa
    • 1
  • Rodrigo Zeledón
    • 1
  • María Dolores Bargues
    • 2
  1. 1.Laboratorio de Zoonosis, Escuela de Medicina VeterinariaUniversidad NacionalHerediaCosta Rica
  2. 2.Departamento de Parasitología, Facultad de FarmaciaUniversidad de ValenciaBurjassot–ValenciaSpain

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