PCR-based diagnosis of human fungal infections

Area of Science:

• Medical Mycology
• Molecular Diagnostics
• Infectious Disease

Background:

• Polymerase Chain Reaction (PCR) is valuable for pathogen detection but faces challenges with fungal targets.
• Fungal cell walls hinder DNA extraction, potentially causing false-negative PCR results.
• Ubiquitous environmental fungi can contaminate reagents, leading to false-positive PCR results.

Purpose of the Study:

• To assess the quality of PCR-based diagnostic studies for fungal pathogens.
• To evaluate taxon-directed PCR assays for invasive aspergillosis, candidiasis, and Pneumocystis pneumonia.
• To review broad-range fungal PCR assays for detecting diverse fungal pathogens.

Main Methods:

• Analysis of 42 variables based on the Minimum Information for Publication of Quantitative Real-Time PCR Experiments (MIQE) guidelines.
• Focus on taxon-directed PCR assays for specific invasive fungal infections.
• Evaluation of broad-range PCR assays for comprehensive fungal detection.

Main Results:

• Identified challenges in PCR-based fungal diagnostics, including DNA extraction efficiency and contamination.
• Assessed the quality of existing PCR studies against MIQE standards.
• Reviewed the performance of both specific and broad-range fungal PCR assays.

Conclusions:

• Improving PCR methodologies is crucial for accurate fungal pathogen detection.
• Adherence to MIQE guidelines enhances the reliability of quantitative PCR studies.
• Standardized protocols are needed to overcome challenges in fungal PCR diagnostics and minimize false results.