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  • 1
    Publication Date: 2008-01-11
    Description: Sex determination in fungi is controlled by a small, specialized region of the genome in contrast to the large sex-specific chromosomes of animals and some plants. Different gene combinations reside at these mating-type (MAT) loci and confer sexual identity; invariably they encode homeodomain, alpha-box, or high mobility group (HMG)-domain transcription factors. So far, MAT loci have been characterized from a single monophyletic clade of fungi, the Dikarya (the ascomycetes and basidiomycetes), and the ancestral state and evolutionary history of these loci have remained a mystery. Mating in the basal members of the kingdom has been less well studied, and even their precise taxonomic inter-relationships are still obscure. Here we apply bioinformatic and genetic mapping to identify the sex-determining (sex) region in Phycomyces blakesleeanus (Zygomycota), which represents an early branch within the fungi. Each sex allele contains a single gene that encodes an HMG-domain protein, implicating the HMG-domain proteins as an earlier form of fungal MAT loci. Additionally, one allele also contains a copy of a unique, chromosome-specific repetitive element, suggesting a generalized mechanism for the earliest steps in the evolution of sex determination and sex chromosome structure in eukaryotes.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Idnurm, Alexander -- Walton, Felicia J -- Floyd, Anna -- Heitman, Joseph -- England -- Nature. 2008 Jan 10;451(7175):193-6. doi: 10.1038/nature06453.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Molecular Genetics and Microbiology, Duke University Medical Center, Durham, North Carolina 27710, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18185588" target="_blank"〉PubMed〈/a〉
    Keywords: Alleles ; Amino Acid Sequence ; Chromosomes, Fungal/genetics ; Computational Biology ; Fertility/genetics ; Fungal Proteins/chemistry/genetics ; Fungi/classification/*genetics ; Genes, Fungal/*genetics ; Genes, Mating Type, Fungal/genetics ; HMG-Box Domains ; Heterozygote ; High Mobility Group Proteins/chemistry/genetics ; Molecular Sequence Data ; *Phylogeny ; Recombination, Genetic/genetics ; Repetitive Sequences, Nucleic Acid/genetics ; *Sex ; *Sex Determination Processes
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 2
    Publication Date: 2005-01-18
    Description: Cryptococcus neoformans is a basidiomycetous yeast ubiquitous in the environment, a model for fungal pathogenesis, and an opportunistic human pathogen of global importance. We have sequenced its approximately 20-megabase genome, which contains approximately 6500 intron-rich gene structures and encodes a transcriptome abundant in alternatively spliced and antisense messages. The genome is rich in transposons, many of which cluster at candidate centromeric regions. The presence of these transposons may drive karyotype instability and phenotypic variation. C. neoformans encodes unique genes that may contribute to its unusual virulence properties, and comparison of two phenotypically distinct strains reveals variation in gene content in addition to sequence polymorphisms between the genomes.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3520129/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3520129/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Loftus, Brendan J -- Fung, Eula -- Roncaglia, Paola -- Rowley, Don -- Amedeo, Paolo -- Bruno, Dan -- Vamathevan, Jessica -- Miranda, Molly -- Anderson, Iain J -- Fraser, James A -- Allen, Jonathan E -- Bosdet, Ian E -- Brent, Michael R -- Chiu, Readman -- Doering, Tamara L -- Donlin, Maureen J -- D'Souza, Cletus A -- Fox, Deborah S -- Grinberg, Viktoriya -- Fu, Jianmin -- Fukushima, Marilyn -- Haas, Brian J -- Huang, James C -- Janbon, Guilhem -- Jones, Steven J M -- Koo, Hean L -- Krzywinski, Martin I -- Kwon-Chung, June K -- Lengeler, Klaus B -- Maiti, Rama -- Marra, Marco A -- Marra, Robert E -- Mathewson, Carrie A -- Mitchell, Thomas G -- Pertea, Mihaela -- Riggs, Florenta R -- Salzberg, Steven L -- Schein, Jacqueline E -- Shvartsbeyn, Alla -- Shin, Heesun -- Shumway, Martin -- Specht, Charles A -- Suh, Bernard B -- Tenney, Aaron -- Utterback, Terry R -- Wickes, Brian L -- Wortman, Jennifer R -- Wye, Natasja H -- Kronstad, James W -- Lodge, Jennifer K -- Heitman, Joseph -- Davis, Ronald W -- Fraser, Claire M -- Hyman, Richard W -- AI47087/AI/NIAID NIH HHS/ -- AI48594/AI/NIAID NIH HHS/ -- R01 AI050184/AI/NIAID NIH HHS/ -- R01 AI050184-05/AI/NIAID NIH HHS/ -- R01 HL088905/HL/NHLBI NIH HHS/ -- R01 HL088905-04A2/HL/NHLBI NIH HHS/ -- New York, N.Y. -- Science. 2005 Feb 25;307(5713):1321-4. Epub 2005 Jan 13.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Institute for Genomic Research, 9712 Medical Center Drive, Rockville, MD 20850, USA. bjloftus@tigr.org〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15653466" target="_blank"〉PubMed〈/a〉
    Keywords: Alternative Splicing ; Cell Wall/metabolism ; Chromosomes, Fungal/genetics ; Computational Biology ; Cryptococcus neoformans/*genetics/pathogenicity/physiology ; DNA Transposable Elements ; Fungal Proteins/metabolism ; Gene Library ; Genes, Fungal ; *Genome, Fungal ; Humans ; Introns ; Molecular Sequence Data ; Phenotype ; Polymorphism, Genetic ; Polymorphism, Single Nucleotide ; Polysaccharides/metabolism ; RNA, Antisense ; Sequence Analysis, DNA ; Transcription, Genetic ; Virulence ; Virulence Factors/metabolism
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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