Two primer pairs to detect OTA producers by PCR method

Area of Science:

• Food microbiology
• Mycotoxicology
• Molecular diagnostics

Background:

• Fungal contamination of food and feed can lead to ochratoxin A (OTA) production, a significant health concern.
• Early and rapid detection of OTA-producing fungi is crucial for mitigating the adverse effects of OTA contamination.

Purpose of the Study:

• To design and evaluate specific PCR primer pairs for the detection of ochratoxin A (OTA) and citrinin producing fungi.
• To develop a rapid molecular method for identifying Aspergillus ochraceus, a known OTA producer, in foodstuffs.

Main Methods:

• Design of two specific PCR primer pairs (AoLC35-12L/AoLC35-12R and AoOTAL/AoOTAR) based on a polyketide synthase gene sequence from Aspergillus ochraceus NRRL 3174.
• Testing of primer pair efficacy on 14 different fungal species using PCR amplification.

Main Results:

• The primer pair AoLC35-12L/AoLC35-12R successfully amplified a unique band from fungi capable of producing either OTA or citrinin.
• The primer pair AoOTAL/AoOTAR exclusively amplified a PCR product from Aspergillus ochraceus.
• Both primer sets demonstrated specificity in detecting target fungi from a mixed panel.

Conclusions:

• The developed PCR primers offer a rapid and specific method for detecting ochratoxin A (OTA) and citrinin producing fungi.
• The AoOTAL/AoOTAR primer pair provides a targeted approach for identifying Aspergillus ochraceus in food and feed samples.
• These molecular tools can significantly aid in food safety by enabling early detection of mycotoxin-producing fungi.