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Mating factor linkage and genome evolution in basidiomycetous pathogens of cereals
- Source :
- Fungal genetics and biology : FGB. 43(9)
- Publication Year :
- 2006
-
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.
- Subjects :
- Genome evolution
Mating type
Retroelements
Ustilago
Genetic Linkage
Mating Factor
Retrotransposon
Locus (genetics)
Microbiology
Genome
Pheromones
Evolution, Molecular
Fungal Proteins
Genetics
Plant Diseases
Ustilago hordei
biology
food and beverages
Sex Determination Processes
biology.organism_classification
Genes, Mating Type, Fungal
Physical Chromosome Mapping
Tandem Repeat Sequences
Genome, Fungal
Edible Grain
Subjects
Details
- ISSN :
- 10871845
- Volume :
- 43
- Issue :
- 9
- Database :
- OpenAIRE
- Journal :
- Fungal genetics and biology : FGB
- Accession number :
- edsair.doi.dedup.....968b550bd863bec3cc4c2bb4adfc44cc