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Fungal Genet Biol

Title:		Mating factor linkage and genome evolution in basidiomycetous pathogens of cereals
Author(s):		Bakkeren G; Jiang G; Warren RL; Butterfield Y; Shin H; Chiu R; Linning R; Schein J; Lee N; Hu G; Kupfer DM; Tang Y; Roe BA; Jones S; Marra M; Kronstad JW;
Address:		"Pacific Agri-Food Research Centre, Agriculture and Agri-Food Canada, Summerland, BC. BakkerenG@agr.gc.ca"
Journal Title:		Fungal Genet Biol
Year:		2006
Volume:		20060621
Issue:		9
Page Number:		655 - 666
DOI:		10.1016/j.fgb.2006.04.002
ISSN/ISBN:		1087-1845 (Print) 1087-1845 (Linking)
Abstract:		"Sex in basidiomycete fungi is controlled by tetrapolar mating systems in which two unlinked gene complexes determine up to thousands of mating specificities, or by bipolar systems in which a single locus (MAT) specifies different sexes. The genus Ustilago contains bipolar (Ustilago hordei) and tetrapolar (Ustilago maydis) species and sexual development is associated with infection of cereal hosts. The U. hordei MAT-1 locus is unusually large (approximately 500 kb) and recombination is suppressed in this region. We mapped the genome of U. hordei and sequenced the MAT-1 region to allow a comparison with mating-type regions in U. maydis. Additionally the rDNA cluster in the U. hordei genome was identified and characterized. At MAT-1, we found 47 genes along with a striking accumulation of retrotransposons and repetitive DNA; the latter features were notably absent from the corresponding U. maydis regions. The tetrapolar mating system may be ancestral and differences in pathogenic life style and potential for inbreeding may have contributed to genome evolution"
Keywords:		"Edible Grain/*microbiology Evolution, Molecular Fungal Proteins/*genetics *Genes, Mating Type, Fungal Genetic Linkage Genome, Fungal Pheromones/*genetics Physical Chromosome Mapping Plant Diseases/*microbiology Retroelements/genetics *Sex Determination Pr;"
Notes:		"MedlineBakkeren, Guus Jiang, Guoqiao Warren, Rene L Butterfield, Yaron Shin, Heesun Chiu, Readman Linning, Rob Schein, Jacqueline Lee, Nancy Hu, Guanggan Kupfer, Doris M Tang, Yuhong Roe, Bruce A Jones, Steven Marra, Marco Kronstad, James W eng Research Support, Non-U.S. Gov't 2006/06/24 Fungal Genet Biol. 2006 Sep; 43(9):655-66. doi: 10.1016/j.fgb.2006.04.002. Epub 2006 Jun 21"