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Sporulation in Ashbya gossypii
1Department of Microbiology and Biochemistry, Hochschule Geisenheim University, Von-Lade-Strasse 1, D-65366 Geisenheim, Germany.
Journal of Fungi (Basel, Switzerland)
|September 3, 2020
Summary
Ashbya gossypii, a filamentous fungus, produces abundant riboflavin and spores. Key genes regulate its sporulation, influenced by nutrient levels and mating type, with Tpk2 playing a dual role.
Area of Science:
- Mycology
- Molecular Biology
- Genetics
Background:
- Ashbya gossypii is a filamentous ascomycete in the Saccharomycetaceae family.
- It produces abundant riboflavin and spores during its stationary growth phase.
- Spore morphology and aggregation vary within the genus, with A. gossypii exhibiting needle-shaped spores.
Purpose of the Study:
- To review the regulation of sporulation in Ashbya gossypii.
- To focus on central regulatory genes involved in ascus development and spore maturation.
- To discuss current research and open questions in the field.
Main Methods:
- Gene-function analyses
- Global RNA-sequencing (RNA-seq) transcriptomics
- Review of existing literature on ascus development and sporulation regulation.
Main Results:
- Sporulation is regulated by conserved genes (IME1, IME2, IME4, KAR4) and influenced by nutrient depletion via the cAMP-PKA pathway and SOK2.
- Exogenous cAMP and MATα2 overexpression inhibit sporulation.
- Msn2/4 are involved in spore wall formation, and Tpk2 has a dual role in initiating sporulation and breaking spore dormancy.
Conclusions:
- The review summarizes current knowledge on Ashbya gossypii sporulation, highlighting conserved regulatory mechanisms.
- Tpk2 is identified as a key kinase for both sporulation initiation and germination.
- Further research is needed to address open questions regarding sporulation and spore maturation.
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