Randomly amplified polymorphic DNA as a valuable tool for epidemiological studies of Paracoccidioides brasiliensis.
Randomly amplified polymorphic DNA (RAPD) has been successfully used to detect genetic variations among isolates of Paracoccidioides brasiliensis. However, the usefulness of this technique for assessing important parasitic properties is still unconfirmed. In the present work we further investigated the applicability of RAPD in revealing important intrinsic and extrinsic features of this fungus associated with geographical origin, time of isolation, source of clinical specimen, clinical forms of human disease and also in vitro and in vivo susceptibility to antimicrobial and antifungal drugs. The RAPD patterns allowed us to distinguish all of the analyzed strains, which included 26 clinical isolates, 2 animal isolates, and 1 environmental isolate of P. brasiliensis obtained from different geographic regions, confirming the strong discriminating power of this technique. A phenetic tree, build from the RAPD data, showed that although the two nonclinical Brazilian strains were set together the majority of the clinical Brazilian strains were randomly distributed through different sub-branches of a major cluster without any correlation to any of the parameters analyzed. A second major cluster, however, has grouped isolates from Mato Grosso and Roraima (Brazil) that not only were susceptible in vitro to trimethoprim-sulfamethoxazole but also produced a good in vivo response. These results open new vistas for epidemiological and clinical studies of P. brasiliensis.
Hahn
Rosane Christine
RC
Departamento de Microbiologia, Instituto de Ciências Biológicas Universidade Federal de Minas Gerais Belo Horizonte, Brazil.
Macedo
Andréa Mara
AM
Fontes
Cor Jesus Fernandes
CJ
Batista
Renata Dias
RD
Santos
Niriana Lara
NL
Hamdan
Júnia Soares
JS
D000666:Amphotericin B / Q000494:pharmacology; D000818:Animals; D000935:Antifungal Agents / Q000494:pharmacology; D014644:Genetic Variation; D006801:Humans; D008826:Microbial Sensitivity Tests; D010228:Paracoccidioides / Q000145:classification* / Q000187:drug effects / Q000235:genetics / Q000302:isolation & purification; D010229:Paracoccidioidomycosis / Q000453:epidemiology* / Q000382:microbiology; D019105:Random Amplified Polymorphic DNA Technique; D015662:Trimethoprim, Sulfamethoxazole Drug Combination / Q000494:pharmacology
D000935:Antifungal Agents; D000666:Amphotericin B; D015662:Trimethoprim, Sulfamethoxazole Drug Combination