A mutant defective in sexual development produces aseptate ascogonia

Sandra Bloemendal, Kathryn M. Lord, Christine Rech, Birgit Hoff, Ines Engh, Nick D. Read, Ulrich Kueck

Research output: Contribution to journalArticlepeer-review


The transition from the vegetative to the sexual cycle in filamentous ascomycetes is initiated with the formation of ascogonia. Here, we describe a novel type of sterile mutant from Sordaria macrospora with a defect in ascogonial septum formation. This mutant, named pro22, produces only small, defective protoperithecia and carries a point mutation in a gene encoding a protein that is highly conserved throughout eukaryotes. Sequence analyses revealed three putative transmembrane domains and a C-terminal domain of unknown function. Live-cell imaging showed that PRO22 is predominantly localized in the dynamic tubular and vesicular vacuolar network of the peripheral colony region close to growing hyphal tips and in ascogonia; it is absent from the large spherical vacuoles in the vegetative hyphae of the subperipheral region of the colony. This points to a specific role of PRO22 in the tubular and vesicular vacuolar network, and the loss of intercalary septation in ascogonia suggests that PRO22 functions during the initiation of sexual development.

Original languageEnglish
Pages (from-to)1856-1866
Number of pages11
JournalEukaryotic Cell
Issue number12
Early online date15 Oct 2010
Publication statusPublished - 1 Dec 2010


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