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Case Reports
. 2013 Jan 23:13:13.
doi: 10.1186/1471-2180-13-13.

Analysis of strain relatedness using high resolution melting in a case of recurrent candiduria

Sara Gago  1 , Belen Lorenzo, Alicia Gomez-Lopez, Isabel Cuesta, Manuel Cuenca-Estrella, Maria J Buitrago
Affiliations
Case Reports

Analysis of strain relatedness using high resolution melting in a case of recurrent candiduria

Sara Gago et al. BMC Microbiol. .

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.

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Figures

Figure 1
Figure 1
Difference plots for the normalized and temperature shifted melting curves for microsatellite from control population and patient strains. A) CDC3 marker; B) EF3 marker and C) HIS3 marker.
See this image and copyright information in PMC

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