The Aα Mating-Type Transcripts of Schizophyllum commune

Yang, H., Shen, G-P., Park, D.C., Novotny, C. P., and Ullrich, R. C. 1995. The Aα mating-type transcripts of Schizophyllum commune. Experimental Mycology 19, 16-25. Aα1, Aα3, and Aα4 ds- and ss-DNA probes from the polymorphic Aα mating-type locus of Schizophyllum commune were used to probe Northern blots of poly(A +) RNA extracted from strains of various Aα mating types. The purpose of these experiments was to identify, map, and characterize the transcripts produced from the regions of the Aα locus. The transcripts unique to Aα mating type map colinear with the open reading frames identified from DNA sequence and are encoded within the fragments which activate the A developmental pathway in transformation. These data confirm the existence and structure of the previously hypothesized Y and Z Aα mating-type genes. Transcripts from the Y and Z genes are present in vegetative cells of homokaryons and dikaryons and in cells of the fruiting bodies. The presence of the transcripts throughout the life cycle is consistent with the model of Y and Z proteins as "master switches" of A-regulated development.