Microbial Bioactives
Microbial Bioactives | Online ISSN 2209-2161
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Volume 8 Number 1 2025
REVIEWS (Open Access)
Ergot Alkaloid Biosynthesis Across Fungal Lineages: Evolutionary Genomics, Metabolic Diversity, and Emerging Biotechnological Opportunities
Kamran Ashraf1,*, Wasim Ahmad2
Microbial Bioactives 8 (1) 1-12 https://doi.org/10.25163/microbbioacts.8110651
Submitted: 21 January 2025 Revised: 12 March 2025 Accepted: 24 March 2025 Published: 26 March 2025
Abstract
Abstract
Ergot alkaloids occupy a rather unusual position in fungal biology. Historically, they were feared because of their association with ergotism and mass poisoning events, yet over time they have also become indispensable in medicine, agriculture, and biotechnology. This systematic review synthesizes current evidence on the biosynthesis, evolutionary diversification, and ecological significance of ergot alkaloids across major fungal lineages. Using PRISMA-guided methodologies, studies involving comparative genomics, biosynthetic pathways, and ergot alkaloid synthesis (EAS) gene clusters were systematically evaluated to examine how cluster organization influences metabolite diversity and fungal adaptation. The findings suggest that ergot alkaloid pathways are built upon a remarkably conserved biosynthetic core, although substantial variation exists in cluster size, accessory genes, and metabolic outcomes among taxa. Expanded EAS clusters in Claviceps purpurea and Epichloë festucae were strongly associated with the production of structurally complex peptide alkaloids, whereas reduced clusters in Aspergillus and Arthrodermataceae species appeared linked to simpler clavine derivatives or pathway intermediates. Meta-analytical assessments further indicated moderate heterogeneity but consistent evolutionary trends toward biosynthetic specialization in plant-associated fungi. Beyond evolutionary insights, the review highlights growing opportunities for synthetic biology, enzyme engineering, and pharmaceutical exploitation of ergot alkaloid pathways. Altogether, the study reframes ergot alkaloids not simply as toxic fungal metabolites, but as dynamic evolutionary innovations with enduring ecological and biomedical relevance
Keywords: Ergot alkaloids, Fungal secondary metabolism, EAS gene clusters, Comparative genomics, Ergopeptines Evolutionary biosynthesis, Fungal biotechnology
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