Carbon Catabolite Repression Governs Diverse Physiological Processes and Development in Aspergillus nidulans

Area of Science:

• Microbiology
• Molecular Biology
• Genetics

Background:

• Carbon catabolite repression (CCR) is vital for microbial fitness and pathogenesis.
• The transcription factor CreA/Cre1 mediates CCR in filamentous fungi, but its global roles are unclear.
• Understanding CreA/Cre1 is crucial for industrial and pathogenic fungi.

Purpose of the Study:

• To delineate the direct and indirect roles of Aspergillus nidulans CreA.
• To investigate CreA's regulatory mechanisms and global function.
• To explore connections between carbon metabolism and other cellular processes.

Main Methods:

• Transcriptome sequencing (RNA-seq).
• Chromatin immunoprecipitation sequencing (ChIP-seq).
• Analysis in the model fungus Aspergillus nidulans.

Main Results:

• CreA regulates diverse physiological processes beyond carbon metabolism, including secondary metabolism, iron homeostasis, and development.
• CreA directly and indirectly influences a wide range of genes and transcription factors.
• Identified CreA as a master regulator controlling multiple regulatory networks.

Conclusions:

• CreA has extensive roles beyond carbon metabolism, linking it to various cellular functions.
• CreA acts as a master regulator, controlling numerous transcription factors.
• Findings provide mechanistic insights into CreA regulation and highlight functional divergence from yeast orthologs.