Genome comparisons reveal a dominant mechanism of chromosome number reduction in grasses and accelerated genome evolution in Triticeae
| Autor: | Jorge Dubcovsky, Devin Coleman-Derr, Yong Q. Gu, Frank M. You, Hwa-Young Heo, J. Hadam, Calvin O. Qualset, Eduard Akhunov, Nancy K. Blake, Patrick E. McGuire, E. Conley, Olin D. Anderson, Naxin Huo, Gerard R. Lazo, Marilyn L. Warburton, Bikram S. Gill, David E. Matthews, D. M. Toleno, C. C. Crossman, Jan Dvorak, Ming-Cheng Luo, D. A. Tabanao, Alina Akhunova, Chao Tian, Michael T. Clegg, Luther E. Talbert, Ken Deal, J. Renfro, Peter L. Morrell, James A. Anderson, Yaqin Ma, Wenjun Zhang |
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| Rok vydání: | 2009 |
| Předmět: |
Translocation
Genetic dysploidy Models wheat Chromosome regions Triticeae Triticum Phylogeny Expressed Sequence Tags Genetics Genome Multidisciplinary biology Chromosome Mapping food and beverages Single Nucleotide Biological Sciences Telomere Genome Plant Biotechnology Evolution Centromere Translocation Oryza sativa Poaceae Polymorphism Single Nucleotide Synteny Chromosomes Plant Chromosomes Evolution Molecular Chromosome 16 Genetic Species Specificity Chromosome 19 Aegilops tauschii Polymorphism Sorghum Models Genetic rice Human Genome Molecular Oryza Plant biology.organism_classification linkage map Chromosome 3 Chromosome Inversion Chromosome 21 |
| Zdroj: | Luo, MC; Deal, KR; Akhunov, ED; Akhunova, AR; Anderson, OD; Anderson, JA; et al.(2009). Genome comparisons reveal a dominant mechanism of chromosome number reduction in grasses and accelerated genome evolution in Triticeae. Proceedings of the National Academy of Sciences of the United States of America, 106(37), 15780-15785. doi: 10.1073/pnas.0908195106. UC Irvine: Retrieved from: http://www.escholarship.org/uc/item/7jc4h6mv Proceedings of the National Academy of Sciences of the United States of America, vol 106, iss 37 |
| ISSN: | 1091-6490 0027-8424 |
| DOI: | 10.1073/pnas.0908195106 |
| Popis: | Single-nucleotide polymorphism was used in the construction of an expressed sequence tag map of Aegilops tauschii , the diploid source of the wheat D genome. Comparisons of the map with the rice and sorghum genome sequences revealed 50 inversions and translocations; 2, 8, and 40 were assigned respectively to the rice, sorghum, and Ae. tauschii lineages, showing greatly accelerated genome evolution in the large Triticeae genomes. The reduction of the basic chromosome number from 12 to 7 in the Triticeae has taken place by a process during which an entire chromosome is inserted by its telomeres into a break in the centromeric region of another chromosome. The original centromere–telomere polarity of the chromosome arms is maintained in the new chromosome. An intrachromosomal telomere–telomere fusion resulting in a pericentric translocation of a chromosome segment or an entire arm accompanied or preceded the chromosome insertion in some instances. Insertional dysploidy has been recorded in three grass subfamilies and appears to be the dominant mechanism of basic chromosome number reduction in grasses. A total of 64% and 66% of Ae. tauschii genes were syntenic with sorghum and rice genes, respectively. Synteny was reduced in the vicinity of the termini of modern Ae. tauschii chromosomes but not in the vicinity of the ancient termini embedded in the Ae. tauschii chromosomes, suggesting that the dependence of synteny erosion on gene location along the centromere–telomere axis either evolved recently in the Triticeae phylogenetic lineage or its evolution was recently accelerated. |
| Databáze: | OpenAIRE |
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