Rapid identification of medically important Candida isolates using high resolution melting analysis

Area of Science:

• Clinical Microbiology
• Molecular Diagnostics
• Mycology

Background:

• Increasing prevalence of non-albicans Candida infections necessitates rapid and accurate species identification.
• Varied antifungal susceptibility patterns among Candida species complicate treatment decisions.
• Current diagnostic methods may lack the speed and specificity required for timely clinical intervention.

Purpose of the Study:

• To develop and evaluate a real-time PCR coupled with high-resolution melting analysis (HRMA) for identifying medically important Candida species.
• To assess the diagnostic performance of HRMA compared to phenotypic methods and ITS2 sequencing.
• To establish HRMA as a reliable tool for clinical Candida species identification.

Main Methods:

• Development of a real-time PCR assay targeting Candida species.
• Application of high-resolution melting analysis (HRMA) for post-PCR analysis.
• Validation using 25 reference strains and 143 clinical isolates, with ITS2 sequencing for ambiguous results.

Main Results:

• HRMA successfully distinguished 23 out of 27 Candida species tested.
• Four species were resolved into two pairs based on melting curve characteristics.
• The method demonstrated high accuracy when validated against clinical isolates and reference strains.

Conclusions:

• Real-time PCR with HRMA is a simple, rapid, and cost-effective method for identifying a broad range of clinically significant Candida species.
• HRMA can serve as a valuable complementary tool to existing diagnostic approaches, including biochemical kits.
• This molecular technique enhances the ability to manage Candida infections effectively by providing timely and accurate species identification.