Decoding azole resistance mechanisms and pathogenicity in Aspergillus section Fumigati through genomic analysis

Area of Science:

• Mycology
• Genomics
• Evolutionary Biology

Background:

• Aspergillus fumigatus causes aspergillosis, but cryptic species within the Fumigati section present varied pathogenicity and antifungal resistance.
• Understanding the genomic and proteomic differences is crucial for clinical and environmental relevance.

Purpose of the Study:

• To perform a comparative genomic and proteomic analysis of Aspergillus fumigatus and four cryptic species (A. lentulus, A. udagawae, A. felis, A. hiratsukae).
• To integrate antifungal resistance mechanisms and virulence factors across the available genomic landscape of section Fumigati.

Main Methods:

• Comparative analysis of 42 genomes, including five newly sequenced ones.
• Prediction and comparison of corresponding proteomes.
• Integration of antifungal resistance and virulence factor data.

Main Results:

• Aspergillus fumigatus shows a conserved core proteome, while A. felis and A. lentulus exhibit greater genomic plasticity.
• Azole resistance is driven by species-specific point mutations, not shared across section Fumigati.
• Secondary metabolism pathways, including biosynthetic gene clusters and mycotoxin production, show significant variation among species.

Conclusions:

• Genomic conservation and divergence drive azole resistance and pathogenicity in Aspergillus fumigatus sensu lato.
• Species-specific mutations are key to azole resistance.
• Variations in secondary metabolism contribute to fitness and pathogenicity differences.