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Genetics, Vol 129, 707-716, Copyright © 1991
INVESTIGATIONS |
A Mushroom-Inducing DNA Sequence Isolated From the Basidiomycete, Schizophyllum commune
J. S. Horton and C. A. Raper
Department of Microbiology and Molecular Genetics, University of Vermont, Burlington, Vermont 05405
A DNA sequence capable of inducing the de novo development of fruiting bodies (mushrooms) when integrated into the genome of unmated, nonfruiting strains of the Basidiomycete Schizophyllum commune has been isolated and partially characterized. This sequence, designated FRT1, overrides the normal requirement of a mating interaction for fruiting in this organism. It has been shown to integrate stably in different chromosome locations and appears to be trans-acting. It also enhances the normal process of fruiting that occurs after mating. Additional DNA sequences with similarity to FRT1 were detected within the genome of the strain of origin by hybridization of labeled FRT1 DNA to blots of digested genomic DNAs. FRT1 and the genomic sequences similar to it were shown to be genetically linked. Southern hybridization experiments suggested sequence divergence at the FRT1 locus between different strains of S. commune. A testable model for how FRT1 may act as a key element in the pathway for the differentiation of fruiting bodies is presented as a working hypothesis for further investigation.
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