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Memórias do Instituto Oswaldo Cruz

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


VIDIGAL, Teofânia HDA; CALDEIRA, Roberta Lima; SIMPSON, Andrew JG  and  CARVALHO, Omar S. Further studies on the molecular systematics of Biomphalaria snails from Brazil . Mem. Inst. Oswaldo Cruz [online]. 2000, vol.95, n.1, pp.57-66. ISSN 0074-0276.

The polymerase chain reaction and restriction fragment length polymorphism (RFLP) of the internal transcribed spacer (ITS) region of the rRNA gene, using the enzyme DdeI were used for the molecular identification of ten species and one subspecies of Brazilian Biomphalaria. Emphasis is given to the analysis of B. oligoza, B. schrammi and B. amazonica. The RFLP profiles obtained using this enzyme were highly distinctive for the majority of the species and exhibited low levels of intraspecific polymorphism among specimens from different regions of Brazil. However, B. peregrina and B. oligoza presented very similar profiles that complicated their identification at the molecular level and suggested a very close genetic similarity between the two species. Others enzymes including HaeIII, HpaII, AluI and MnlI were tested for their ability to differentiate these species. For B. amazonica three variant profiles produced with DdeI were observed. The study demonstrated that the ITS contains useful genetic markers for the identification of these snails

Keywords : Biomphalaria; ribosomal DNA; internal transcribed spacer; polymerase chain reaction; Brazil.

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