Chromatin mapping identifies BasR, a key regulator of bacteria-triggered production of fungal secondary metabolites

The eukaryotic epigenetic machinery can be modified by bacteria to reprogram the response of eukaryotes during their interaction with microorganisms. We discovered that the bacteriumStreptomyces rapamycinicus triggered increased chromatin acetylation and thus activation of the silent secondary metabolismors gene cluster in the fungusAspergillus nidulans. Using this model we aim at understanding mechanisms of microbial communication based on bacteria-triggered chromatin modification. By genome-wide ChIP-seq analysis of acetylated histone H3 we uncovered the unique chromatin landscape inA. nidulans upon co-cultivation withS. rapamycinicus and relate changes in the acetylation to that in the fungal transcriptome. Differentially acetylated histones were detected in genes involved in secondary metabolism, amino acid and nitrogen metabolism, signaling, and encoding transcription factors. Further molecular analyses identified the Myb-like transcription factor BasR as the regulatory node for transduction of the bacterial signal in the fungus and show its function is conserved in otherAspergillus species.
Source: eLife - Category: Biomedical Science Tags: Microbiology and Infectious Disease Source Type: research