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Proc Natl Acad Sci U S A

Title:		The mating-type and pathogenicity locus of the fungus Ustilago hordei spans a 500-kb region
Author(s):		Lee N; Bakkeren G; Wong K; Sherwood JE; Kronstad JW;
Address:		"Biotechnology Laboratory, Department of Microbiology University of British Columbia, Vancouver, BC, Canada V6T 1Z3"
Journal Title:		Proc Natl Acad Sci U S A
Year:		1999
Volume:		96
Issue:		26
Page Number:		15026 - 15031
DOI:		10.1073/pnas.96.26.15026
ISSN/ISBN:		0027-8424 (Print) 1091-6490 (Electronic) 0027-8424 (Linking)
Abstract:		"The fungal pathogen Ustilago hordei causes the covered smut disease of barley and oats. Mating and pathogenicity in this fungus are controlled by the MAT locus, which contains two distinct gene complexes, a and b. In this study, we tagged the a and b regions with the recognition sequence for the restriction enzyme I-SceI and determined that the distance between the complexes is 500 kb in a MAT-1 strain and 430 kb in a MAT-2 strain. Characterization of the organization of the known genes within the a and b gene complexes provided evidence for nonhomology and sequence inversion between MAT-1 and MAT-2. Antibiotic-resistance markers also were used to tag the a gene complex in MAT-1 strains (phleomycin) and the b gene complex in MAT-2 strains (hygromycin). Crosses were performed with these strains and progeny resistant to both antibiotics were recovered at a very low frequency, suggesting that recombination is suppressed within the MAT region. Overall, the chromosome homologues carrying the MAT locus of U. hordei share features with primitive sex chromosomes, with the added twist that the MAT locus also controls pathogenicity"
Keywords:		"Avena/microbiology Chromosome Mapping Chromosomes, Fungal Electrophoresis, Gel, Pulsed-Field *Genes, Fungal *Genes, Mating Type, Fungal Hordeum/microbiology Mating Factor Peptides Plant Diseases/*genetics Recombination, Genetic Reproduction/genetics Ustil;"
Notes:		"MedlineLee, N Bakkeren, G Wong, K Sherwood, J E Kronstad, J W eng Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, Non-P.H.S. 1999/12/28 Proc Natl Acad Sci U S A. 1999 Dec 21; 96(26):15026-31. doi: 10.1073/pnas.96.26.15026"