MiRNAs regulate iron homeostasis in Paracoccidioides brasiliensis

Area of Science:

• Molecular Biology
• Mycology
• Host-Pathogen Interactions

Background:

• Pathogens employ nutritional immunity, restricting micronutrients like iron, to control infection.
• Fungi in the Paracoccidioides complex alter metabolic pathways to survive host-imposed conditions.
• The molecular mechanisms regulating these metabolic adaptations in Paracoccidioides remain unclear.

Purpose of the Study:

• To characterize microRNA (miRNA) expression profiles in Paracoccidioides brasiliensis under iron deprivation.
• To identify metabolic pathways potentially regulated by these differentially expressed miRNAs.
• To elucidate the role of miRNAs in the adaptive response of Paracoccidioides to iron starvation.

Main Methods:

• RNA sequencing (RNAseq) was utilized to identify and quantify miRNAs.
• Differential expression analysis was performed to detect miRNAs altered during iron deprivation.
• Bioinformatic analyses predicted target genes and associated metabolic pathways for identified miRNAs.

Main Results:

• 45 miRNAs were identified, with eight showing altered expression during iron deprivation.
• Five miRNAs were more abundant in yeast cells under iron deprivation, targeting genes involved in oxidative phosphorylation.
• MiRNAs more abundant in iron-rich conditions targeted genes related to iron homeostasis and uptake.

Conclusions:

• MicroRNAs play a significant role in the metabolic adaptation of Paracoccidioides brasiliensis to iron-limited environments.
• Specific miRNAs regulate key metabolic pathways, such as oxidative phosphorylation, in response to iron availability.
• These findings suggest that miRNAs contribute to the survival and virulence of Paracoccidioides brasiliensis during host infection.