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vol.95 issue6Analysis of parity between protein-based electrophoretic methods for the characterization of oral Candida speciesA new species of predaceous midge of the genus Monohelea Kieffer from Mexico (Diptera: Ceratopogonidae) author indexsubject indexarticles search
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Memórias do Instituto Oswaldo Cruz

Print version ISSN 0074-0276On-line version ISSN 1678-8060


SPATZ, Linus et al. Characterization of Biomphalaria orbignyi, Biomphalaria peregrina and Biomphalaria oligoza by polymerase chain reaction and restriction enzyme digestion of the internal transcribed spacer region of the RNA ribosomal gene. Mem. Inst. Oswaldo Cruz [online]. 2000, vol.95, n.6, pp.807-814. ISSN 0074-0276.

The correct identification of Biomphalaria oligoza, B. orbignyi and B. peregrina species is difficult due to the morphological similarities among them. B. peregrina is widely distributed in South America and is considered a potential intermediate host of Schistosoma mansoni. We have reported the use of the polymerase chain reaction and restriction fragment length polymorphism analysis of the internal transcribed spacer region of the ribosomal DNA for the molecular identification of these snails. The snails were obtained from different localities of Argentina, Brazil and Uruguay. The restriction patterns obtained with MvaI enzyme presented the best profile to identify the three species. The profiles obtained with all enzymes were used to estimate genetic similarities among B. oligoza, B. peregrina and B. orbignyi. This is also the first report of B. orbignyi in Uruguay.

Keywords : Biomphalaria orbignyi; Biomphalaria peregrina; Biomphalaria oligoza; snails; ribosomal DNA; internal transcribed spacer; polymerase chain reaction.

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