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Open Access Research article

Analysis of strain relatedness using High Resolution Melting in a case of recurrent candiduria

Sara Gago1, Belen Lorenzo2, Alicia Gomez-Lopez1, Isabel Cuesta3, Manuel Cuenca-Estrella1 and Maria J Buitrago1*

Author Affiliations

1 Servicio de Micología, Centro Nacional de Microbiología, Instituto de Salud Carlos III, Ctra Majadahonda-Pozuelo, Km 2, Majadahonda, Madrid, 28220, Spain

2 Servicio de Microbiología, Hospital Virgen de la Concha, Zamora, España

3 Unidad de Bioinformática, Centro Nacional de Microbiología, Instituto de Salud Carlos III, Madrid, Spain

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BMC Microbiology 2013, 13:13  doi:10.1186/1471-2180-13-13

Published: 23 January 2013

Abstract

Background

Several genotyping protocols have been described to study Candida albicans strains with different sensitivity values. In this study we have analyzed the genetic relatedness and the antifungal susceptibility of several Candida albicans strains isolated from a patient who from suffered recurrent candiduria for a period of five years. Strains were genotyped using Microsatellite Length Polymorphism (MLP) with three microsatellite markers (HIS 3, EF 3 and CDC 3), and a new method based on high resolution melting (HRM) was developed to analyze the microsatellite region. This method was compared with the conventional technique that uses capillary electrophoresis.

Results

MICs of the isolates showed the existence of fluconazole susceptible and resistant strains. An inter-colony test using single concentration (8 and 16 mg/l) of fluconazole revealed the coexistence of both fluconazole susceptible and resistant strains. Both genotyping analysis methods showed that all the patient’s isolates had a clonal origin. HRM analysis method developed was able to accurately establish strain relatedness and presented a discriminatory power of 0.77.

Conclusions

Although HRM analysis method presented a lower discriminatory power compared to methods based on capillary electrophoresis, it provided a more cost-effective and suitable alternative for genotyping C. albicans in a clinical laboratory.

Keywords:
Candiduria; High resolution melting; Genotyping