Mating Type Systems in Filamentous Fungi
Summary
Filamentous fungi exhibit remarkable diversity in their sexual reproduction strategies, governed primarily by the configuration and regulation of mating type (MAT) loci. These loci encode master regulators that determine compatibility between hyphae, orchestrate the production of pheromones and receptors, and initiate the formation of sexual structures. In heterothallic species, individuals carry a single MAT idiomorph and require a compatible partner to complete the sexual cycle, whereas homothallic species possess both idiomorphs, enabling self-fertility through mechanisms such as primary homothallism, mating type switching or unisexual reproduction. Central to these processes are transcription factors, often featuring high mobility group (HMG) boxes or α-box domains, which control downstream gene networks responsible for hyphal fusion, ascocarp development and ascospore maturation. Recent advances in genomics and transcriptomics have illuminated the dynamic interplay between MAT gene expression, environmental cues and chromatin modifications, revealing how pathogenic and saprotrophic species adapt their reproductive strategies. Understanding these systems has broad implications for agriculture—where sexual spores serve as inoculum—and for biotechnology, where controlled mating can drive strain improvement and natural product discovery.
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Mating Type Systems in Filamentous Fungi publication trend
The graph below shows the total number of articles in mating type systems in filamentous fungi across all publications each year (not limited to Nature Index journals).
Technical terms
MAT locus: A genomic region encoding determinants of mating compatibility.
Heterothallic: Requiring two compatible partners with different MAT idiomorphs to mate.
Homothallic: Capable of self-fertilisation, carrying both MAT idiomorphs in one genome.
Idiomorph: Alternative sequence variant at the MAT locus specifying mating type.
Pheromone receptor: A membrane protein that detects mating pheromones to initiate sexual development.
Chemotropism: Directed growth of hyphae towards a chemical signal.
Ascospore: A sexual spore formed within an ascus following meiosis.
References
- Functional analysis of the mating type genes in Verticillium dahliae. BMC Biology (2024).
- Mutations and Differential Transcription of Mating-Type and Pheromone Receptor Genes in Hirsutella sinensis and the Natural Cordyceps sinensis Insect-Fungi Complex. Biology (2024).
- Structure and number of mating pheromone genes is closely linked to sexual reproductive strategy in Huntiella. BMC Genomics (2023).
- It’s All in the Genes: The Regulatory Pathways of Sexual Reproduction in Filamentous Ascomycetes. Genes (2019).
- Homothallism: an umbrella term for describing diverse sexual behaviours. IMA Fungus (2015).
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