Biosynthetic Gene Clusters in Fungal Secondary Metabolism

Fungal secondary metabolites encompass a vast repertoire of chemically diverse molecules, from antibiotics and toxins to pigments and signalling compounds. Genes encoding the enzymatic machinery for these pathways are frequently organised in contiguous loci known as biosynthetic gene clusters (BGCs). A typical BGC contains genes for key enzymatic activities—polyketide synthases (PKSs), non‐ribosomal peptide synthetases (NRPSs), cytochrome P450 monooxygenases and tailoring enzymes—alongside pathway‐specific regulators and transporters. This physical clustering facilitates coordinated regulation and horizontal transfer, enabling rapid adaptation to ecological pressures. Advances in genome mining have revealed hundreds of cryptic clusters whose products remain unknown, pointing to an untapped reservoir of bioactive compounds. Comparative genomics has shown that BGC content can vary dramatically between species and even among strains, reflecting niche adaptation and arms‐race dynamics with competitors or hosts. The exploration of fungal BGCs thus holds promise for novel drug discovery, agricultural bioactives and synthetic biology, while illuminating fundamental principles of genome evolution, regulation and chemical ecology.

Research from Nature Portfolio

Recent work has introduced a class of microscale culture platforms that integrate microfluidic growth chambers with stable biphasic interfaces for small‐molecule isolation. By coupling growth geometry and media composition with automated liquid–liquid extraction, this system enables high‐throughput mass spectrometric profiling of fungal secondary metabolomes under diverse environmental conditions. Using Aspergillus species as a model, investigators demonstrated that subtle changes in matrix stiffness, aeration and nutrient gradients can activate otherwise silent BGCs, revealing novel natural products. The platform also permits co‐culture experiments, shedding light on interkingdom chemical communication and the inducible nature of specific clusters when fungi encounter bacterial competitors. This approach promises to accelerate the discovery of cryptic metabolites and to delineate how environmental signals interface with cluster regulation.

Biosynthetic Gene Clusters in Fungal Secondary Metabolism publication trend

The graph below shows the total number of articles in biosynthetic gene clusters in fungal secondary metabolism across all publications each year (not limited to Nature Index journals).

Technical terms

Biosynthetic Gene Cluster (BGC): A contiguous set of genes encoding enzymes, regulators and transporters required for the biosynthesis of a specific secondary metabolite.

Secondary Metabolite: A low‐molecular‐weight compound not essential for basic growth but conferring ecological or competitive advantages, such as antibiotics or toxins.

Polyketide Synthase (PKS): A multifunctional enzyme complex that sequentially assembles polyketide backbones from simple acyl‐CoA precursors.

Non‐ribosomal Peptide Synthetase (NRPS): A modular enzyme that links amino acid monomers into peptide chains without the need for ribosomes.

Horizontal Gene Transfer (HGT): The movement of genetic material between organisms by means other than vertical inheritance, contributing to rapid acquisition of novel BGCs.

Cryptic Cluster: A BGC that is transcriptionally silent or expressed at low levels under standard laboratory conditions, often requiring specific triggers for activation.

References

1. The spatial organization of sphingofungin biosynthesis in Aspergillus fumigatus and its cross-interaction with sphingolipid metabolism. mBio (2024).
2. Drivers of genetic diversity in secondary metabolic gene clusters within a fungal species. PLOS Biology (2017).
3. Fungal metabolic gene clusters—caravans traveling across genomes and environments. Frontiers in Microbiology (2015).
4. Microbial metabolomics in open microscale platforms. Nature Communications (2016).