Polymerase chain reaction-based methods for the detection of heat-resistant ascomycetous fungi

Area of Science:

• Food microbiology
• Mycology
• Molecular biology

Background:

• Heat-resistant fungi (Byssochlamys, Thermoascus, Neosartorya) are increasingly linked to food spoilage and health hazards.
• Their ascospores resist standard sterilization, posing a significant microbiological risk in food and beverages.
• Accurate identification of these genera is crucial for food safety and quality management.

Purpose of the Study:

• To develop and validate rapid, specific methods for identifying foodborne heat-resistant fungi.
• To differentiate between Byssochlamys, Thermoascus, Neosartorya, and other common food spoilage fungi.
• To provide a feasible tool for quality control in food production.

Main Methods:

• Utilized Polymerase Chain Reaction (PCR) with genus- and species-specific primer sets.
• Analyzed housekeeping genes (e.g., β-tubulin) for fungal identification.
• Tested primer specificity against target genera and other common food contaminants.

Main Results:

• Developed PCR-based assays that accurately identify Byssochlamys, Thermoascus, and Neosartorya.
• Observed high specificity of PCR amplification products, with no cross-reactivity to other fungal species.
• Demonstrated the speed and simplicity of PCR compared to traditional sequencing methods.

Conclusions:

• PCR methods provide a rapid, simple, and highly specific means for identifying critical heat-resistant fungi.
• These methods are suitable for routine quality management in food production facilities.
• Effective identification aids in mitigating food spoilage and associated health risks.