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Genome comparisons reveal a dominant mechanism of chromosome number reduction in grasses and accelerated genome evolution in Triticeae
- Source :
- 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
- Publication Year :
- 2009
- Publisher :
- Proceedings of the National Academy of Sciences, 2009.
-
Abstract
- 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.
- Subjects :
- 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
Subjects
Details
- ISSN :
- 10916490 and 00278424
- Volume :
- 106
- Database :
- OpenAIRE
- Journal :
- Proceedings of the National Academy of Sciences
- Accession number :
- edsair.doi.dedup.....40f77141a01bd1d813d404020dc6d054