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Molecular typing systems have been needed to study Candida colonization in HIV-infected patients, particularly for investigating virulence and fluconazole resistance. Three methods--electrophoretic karyotyping (EK), detection of restriction fragment length polymorphisms (RFLP) and randomly amplified polymorphic DNA analysis (RAPD)--have been most frequently used. In this study, comparative sequence analysis of the internal transcribed spacer (ITS) region of rDNA was evaluated for delineation of Candida isolates from 14 HIV-infected patients. EK, ITS sequence analysis, RFLP and RAPD resulted in 11, 10, 9 and 8 DNA genotypes, respectively, from 39 Candida albicans isolates. The 10 genotypes observed using ITS sequence analysis were defined by six variation sites in the sequence. Molecular typing of sequential oral isolates showed the persistence of the same genotype of C. albicans in nine patients, and genotype variation in one patient. EK and RAPD showed that another patient was co-infected by two distinct genotypes and ITS analysis identified one of the two genotypes as Candida dubliniensis. Comparative ITS sequence analysis is a quick and reproducible method that provides clear and objective results, and it also identifies C. dubliniensis. The discriminatory power of this new typing approach could be improved by concomitant analysis of other DNA polymorphic sequences.

medical mycology

Evaluation of internal transcribed spacer region of ribosomal DNA sequence analysis for molecular characterization of<i>Candida albicans</i>and<i>Candida dubliniensis</i>isolates from HIV-infected patients

Evaluation of internal transcribed spacer region of ribosomal DNA sequence analysis for molecular characterization ofCandida albicansandCandida dubliniensisisolates from HIV-infected patients