Comparative transcriptomics of Aspergillus fumigatus strains upon exposure to human airway epithelial cells

Area of Science:

• Medical Mycology
• Molecular Biology
• Infectious Diseases

Background:

• Aspergillus fumigatus is a common mold causing allergies and life-threatening infections in immunocompromised individuals.
• Invasion of airway epithelial cells is a crucial step in invasive pulmonary aspergillosis pathogenesis.
• Understanding fungal sensing and response to host cells is vital for disease mechanism elucidation.

Purpose of the Study:

• To analyze the transcriptomes of two Aspergillus fumigatus clinical isolates (Af293 and CEA10) during in vitro infection of A549 pneumocytes.
• To identify conserved and strain-specific transcriptional responses to airway epithelial cells.
• To investigate the influence of host cells versus culture conditions on fungal gene expression.

Main Methods:

• RNA-sequencing (RNA-seq) was performed on Aspergillus fumigatus isolates (Af293 and CEA10).
• Infection model involved co-culture with A549 type II pneumocyte cell line in vitro.
• Analysis focused on the core set of genes common to both strains' genomes.

Main Results:

• Aspergillus fumigatus did not exhibit a conserved transcriptional response to airway epithelial cells in this in vitro model.
• Strain background and duration in tissue culture media had a more significant impact on the transcriptome than host cells.
• Common and strain-specific transcriptional programs were identified, offering insights into gene function and pathogenesis.

Conclusions:

• The transcriptional response of Aspergillus fumigatus to airway epithelial cells is not uniform across strains or conditions.
• Phenotypic heterogeneity in Aspergillus fumigatus isolates may be linked to distinct transcriptional programs.
• Further research can generate hypotheses on gene function related to pathogenesis based on these findings.