Genomic Engineering of Filamentous Fungi for Biotechnological Applications

Filamentous fungi are essential microbial cell factories in the production of organic acids, enzymes, biofuels and pharmaceuticals. Genomic engineering approaches—including targeted gene deletion, overexpression and genome-scale editing—have revolutionised the capacity to rewire metabolic pathways and regulatory networks in these organisms. High-quality genome assemblies and comparative analyses have mapped key gene clusters for secondary metabolite synthesis and carbohydrate-active enzymes (CAZymes), guiding rational strain design. The advent of CRISPR/Cas9 and advanced transformation methods has accelerated precise modifications to boost product titres, diversify biochemical outputs and improve stress tolerance. Engineering efforts in species such as Aspergillus niger, Aspergillus oryzae and Trichoderma reesei have yielded enhanced citric acid production, heterologous biosynthesis of valuable metabolites such as kojic acid, and overproduction of industrially relevant enzymes. These developments underpin a sustainable bioeconomy by enabling low-cost bioprocesses, valorisation of renewable feedstocks and scalable manufacture of high-value compounds, while emphasising the need for robust genetic tools and comprehensive safety assessments to mitigate concerns over mycotoxin formation and regulatory compliance.

Research from Nature Portfolio

Research into inter- and intraspecific genomic variation across multiple Aspergillus species has elucidated the diversity and organisation of CAZymes and secondary metabolite gene clusters, enabling targeted strain improvement for enhanced enzyme secretion and metabolite biosynthesis. Comparative genomics of section Flavi species has redefined phylogenetic relationships and revealed extensive sub-telomeric variation linked to differential CAZyme repertoires and metabolite profiles, underscoring the potential to harness genetic diversity for tailored biotechnological processes. These foundational efforts have informed the development of predictive frameworks for phenotype engineering and have demonstrated heterologous transfer of key biosynthetic pathways between species to expand product portfolios.

Genomic Engineering of Filamentous Fungi for Biotechnological Applications publication trend

The graph below shows the total number of articles in genomic engineering of filamentous fungi for biotechnological applications across all publications each year (not limited to Nature Index journals).

Technical terms

Filamentous fungi: Multicellular fungi characterised by thread-like hyphae that form a network (mycelium).

Genomic engineering: Directed modification of an organism’s DNA to alter or introduce specific genetic traits.

CRISPR/Cas9 system: A genome-editing tool that uses an RNA guide and Cas9 nuclease to induce site-specific DNA modifications.

Heterologous expression: Production of a gene product in a non-native host organism.

CAZymes: Carbohydrate-active enzymes involved in the breakdown, modification or synthesis of polysaccharides.

Secondary metabolites: Bioactive compounds produced by organisms that are not essential for primary metabolic processes but have ecological or industrial relevance.

Bioreactor: A vessel providing controlled environmental conditions for large-scale cultivation of microorganisms.

References

1. Effective production of kojic acid in engineered Aspergillus niger. Microbial Cell Factories (2023).
2. The Effect of Cyclosporin A on Aspergillus niger and the Possible Mechanisms Involved. Foods (2023).
3. Safety of the fungal workhorses of industrial biotechnology: update on the mycotoxin and secondary metabolite potential of Aspergillus niger, Aspergillus oryzae, and Trichoderma reesei. Applied Microbiology and Biotechnology (2018).
4. Methods for genetic transformation of filamentous fungi. Microbial Cell Factories (2017).
5. Investigation of inter- and intraspecies variation through genome sequencing of Aspergillus section Nigri. Nature Genetics (2018).
6. A comparative genomics study of 23 Aspergillus species from section Flavi. Nature Communications (2020).
7. Systems metabolic engineering for citric acid production by Aspergillus niger in the post-genomic era. Microbial Cell Factories (2019).
8. Advances in Genetic Engineering Technology and Its Application in the Industrial Fungus Aspergillus oryzae. Frontiers in Microbiology (2021).