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Genotyping of clinical isolates of Acanthamoeba genus in Venezuela

  • Carolina Wagner , María Reyes-Batlle , María Alejandra Vethencourt Ysea , Mónica V. Galindo Pérez , Carmen Guzmán de Rondón , Anaibeth J. Nessi Paduani , Angelyseb Dorta Pérez , Atteneri López-Arencibia , Ines Sifaoui , María Virginia Pérez de Galindo , Eva Pérez de Suárez , Enrique Martínez-Carretero , Basilio Valladares , José E. Piñero and Jacob Lorenzo-Morales EMAIL logo
Published/Copyright: October 24, 2016
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Abstract

Free-living amoebae of Acanthamoeba genus are opportunistic pathogens distributed worldwide. Strains included in this genus are causative agents of a fatal encephalitis and a sight-threating keratitis in humans and other animals. In this study, 550 clinical samples which were collected between 1984 and 2014 from different patients with suspected infections due to Acanthamoeba were initially screened for the presence of this amoebic genus at the Laboratorio de Amibiasis-Escuela de Bioanálisis at the Universidad Central de Venezuela. Samples were cultured in 2% Non-Nutrient agar plates seeded with a layer of heat killed Escherichia coli. From the 550 clinical samples included in this study, 18 of them were positive for Acanthamoeba genus after culture identification. Moreover, positive samples were confirmed after amplification of the Diagnostic Fragment 3 (DF3) of the Acanthamoeba18S rDNA genus and sequencing was carried out in order to genotype the isolated strains of Acanthamoeba. Furthermore, the pathogenic potential of the strains was checked by performing thermotolerance and osmotolerance assays. Sequencing of the DF3 region resulted in the identification of genotype T4 in all the isolated strains. Moreover, most isolates were thermotolerant or both thermotolerant and osmotolerant and thus were classified as potentially pathogenic strains. To the best of our knowledge, this is the first report on the molecular characterization at the genotype level of Acanthamoeba strains in Venezuela.

Acknowledgements

This work was supported by the grants RICET (project no. RD12/0018/0012 of the programme of Redes Temáticas de Investigación Cooperativa, FIS), Spanish Ministry of Health, Madrid, Spain and the Project FIS PI13/00490 "Protozoosis Emergentes por Amebas de Vida Libre: Aislamiento, Caracterización, Nuevas Aproximaciones Terapéuticas y Traslación Clínica de los Resultados" from the Instituto de Salud Carlos III and Project ref. AGUA3 "Amebas de Vida Libre como Marcadores de Calidad del Agua" from CajaCanarias Fundación. CWA was supported by a grant from Consejo de Desarrollo Científico y Humanístico-Universidad Central de Venezuela (Becario Exterior 2014-2015). MRB and ALA were funded by Becas de Investigación Obra Social La Caixa-Fundación CajaCanarias para Posgraduados de la Universidad de La Laguna. Convocatoria 2014. IS was supported by a grant from the Laboratoire Matériaux-Molécules et Applications, IPEST, and Ayudas para estancias estudiantes de posgrado e investigadores del continente americano y africano 2015 from the ULL. JLM was supported by the Ramón y Cajal Subprogramme from the Spanish Ministry of Economy and Competivity RYC-2011-08863.

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Received: 2016-6-15
Revised: 2016-6-29
Accepted: 2016-6-30
Published Online: 2016-10-24
Published in Print: 2016-12-1

© 2016 W. Stefański Institute of Parasitology, PAS

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