Microsatellite marker analysis as a typing system for Candida glabrata.

Area of Science:

• Medical Mycology
• Molecular Biology
• Infectious Diseases

Background:

• Candida glabrata is a significant cause of hospital-acquired fungal infections.
• Accurate and rapid identification of C. glabrata strains is crucial for infection control and epidemiological studies.

Purpose of the Study:

• To develop a rapid and reliable genotyping method for Candida glabrata using multiplex PCR.
• To assess the discriminatory power of three polymorphic microsatellite markers (RPM2, MTI, ERG3) for C. glabrata strain typing.

Main Methods:

• Multiplex PCR was employed to analyze three microsatellite loci (RPM2, MTI, ERG3) in 138 C. glabrata clinical isolates and 8 reference strains.
• Dye-labeled primers were used for automated sequencing to determine allelic profiles.
• Factorial correspondence analysis was performed to correlate genotypes with clinical data.

Main Results:

• The microsatellite analysis yielded 5, 7, and 15 alleles for RPM2, MTI, and ERG3 loci, respectively, resulting in 21 distinct multilocus genotypes.
• The method demonstrated a discriminatory power of 0.84 and marker stability over 25 subcultures.
• No correlation was found between the identified genotypes and clinical parameters such as patient source, sex, ward, or anatomical site.

Conclusions:

• Microsatellite marker analysis offers a rapid, reliable, and specific method for genotyping Candida glabrata clinical isolates.
• While effective, the current marker set's discriminatory power could be enhanced by incorporating additional polymorphic microsatellite loci.