disseminatus A and B homologs elicited sexual reactions like native mating-type genes. disseminatus is similar to the A mating-type locus of the model species Coprinopsis cinerea and encodes two tightly linked pairs of homeodomain transcription factor genes.
Only the transcription factor genes segregate with mating type, discounting the hypothesis of genetic linkage between the A and B mating-type loci as the causal origin of bipolar mating behavior. Through positional cloning and degenerate PCR, we sequenced both the transcription factor and pheromone receptor mating-type gene homologs from C. Here we determined the genes controlling mating type in the bipolar mushroom Coprinellus disseminatus. Most mushroom species have a tetrapolar mating system, but numerous transitions to bipolar mating systems have occurred. The A and B mating-type loci encode homeodomain transcription factors and pheromones and pheromone receptors, respectively. In tetrapolar species, two unlinked mating-type loci exist (A and B), whereas in bipolar species there is only one locus. Mating incompatibility in mushroom fungi is controlled by the mating-type loci. Srivilai, Prayook Kües, Ursula Vilgalys, Rytas Evolution of the Bipolar Mating System of the Mushroom Coprinellus disseminatus From Its Tetrapolar Ancestors Involves Loss of Mating-Type-Specific Pheromone Receptor Function
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