Journal
JOURNAL OF FUNGI
Volume 7, Issue 5, Pages -Publisher
MDPI
DOI: 10.3390/jof7050399
Keywords
Schizophyllum commune; pheromone receptor-like genes; B mating-type locus; mating; self-recognition
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Funding
- German Science Foundation [SFB 1127, 239748522, 390713860]
- Jena School for Microbial Communication JSMC GSC [124]
- Friedrich Schiller University Jena
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This study provides substantial evidence on the organization of the B mating-type loci in distantly related S. commune strains, showing high synteny in gene order and neighboring genes. Brl1 is proposed to play a role in mating, while Brl3, Brl4, and to a lesser extent Brl2, contribute to vegetative growth and possible determination of growth direction.
The B mating-type locus of the tetrapolar basidiomycete Schizophyllum commune encodes pheromones and pheromone receptors in multiple allelic specificities. This work adds substantial new evidence into the organization of the B mating-type loci of distantly related S. commune strains showing a high level of synteny in gene order and neighboring genes. Four pheromone receptor-like genes were found in the genome of S. commune with brl1, brl2 and brl3 located at the B mating-type locus, whereas brl4 is located separately. Expression analysis of brl genes in different developmental stages indicates a function in filamentous growth and mating. Based on the extensive sequence analysis and functional characterization of brl-overexpression mutants, a function of Brl1 in mating is proposed, while Brl3, Brl4 and Brl2 (to a lower extent) have a role in vegetative growth, possible determination of growth direction. The brl3 and brl4 overexpression mutants had a dikaryon-like, irregular and feathery phenotype, and they avoided the formation of same-clone colonies on solid medium, which points towards enhanced detection of self-signals. These data are supported by localization of Brl fusion proteins in tips, at septa and in not-yet-fused clamps of a dikaryon, confirming their importance for growth and development in S. commune.
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