Rapid divergence of repetitive DNAs in Brassica relatives. 2011

Dal-Hoe Koo, and Chang Pyo Hong, and Jacqueline Batley, and Yong Suk Chung, and David Edwards, and Jae-Wook Bang, and Yoonkang Hur, and Yong Pyo Lim
Department of Biological Science, College of Biological Science and Biotechnology, Chungnam National University, Daejeon 305-764, Republic of Korea.

Centromeric, subtelomeric, and telomeric repetitive DNAs were characterized in Brassica species and the related Raphanus sativus and Arabidopsis thaliana. In general, rapid divergence of the repeats was found. The centromeric tandem satellite repeats were differentially distributed in the species studied, suggesting that centromeric repeats have diverged during the evolution of the A/C and B genome lineages. Sequence analysis of centromeric repeats suggested rapid evolution. Pericentromere-associated retrotransposons were identified and showed divergence during the evolution of the lineages as centromeric repeats. A novel subtelomeric tandem repeat from B. nigra was found to be conserved across the diploid Brassica genomes; however, this sequence was not identified in the related species. In contrast to previous studies, interstitial telomere-like repeats were identified in the pericentromeres of Brassica chromosomes, and these repeats may be associated with genomic stability. These results provide insight into genome evolution during polyploidization in Brassica and divergence within the Brassicaceae.

UI MeSH Term Description Entries
D009149 Mustard Plant Any of several BRASSICA species that are commonly called mustard. Brassica juncea is brown or Chinese mustard, and Brassica nigra is black, brown, or red mustard. The plant is grown both for mustard seed from which oil is extracted or used as SPICES, and for its greens used as VEGETABLES or ANIMAL FEED. There is no relationship to MUSTARD COMPOUNDS. A species from a related genus SINAPIS ALBA is white mustard. Brassica juncea,Mustard,Brassica nigra,Mustard Plants,Mustards
D012091 Repetitive Sequences, Nucleic Acid Sequences of DNA or RNA that occur in multiple copies. There are several types: INTERSPERSED REPETITIVE SEQUENCES are copies of transposable elements (DNA TRANSPOSABLE ELEMENTS or RETROELEMENTS) dispersed throughout the genome. TERMINAL REPEAT SEQUENCES flank both ends of another sequence, for example, the long terminal repeats (LTRs) on RETROVIRUSES. Variations may be direct repeats, those occurring in the same direction, or inverted repeats, those opposite to each other in direction. TANDEM REPEAT SEQUENCES are copies which lie adjacent to each other, direct or inverted (INVERTED REPEAT SEQUENCES). DNA Repetitious Region,Direct Repeat,Genes, Selfish,Nucleic Acid Repetitive Sequences,Repetitive Region,Selfish DNA,Selfish Genes,DNA, Selfish,Repetitious Region, DNA,Repetitive Sequence,DNA Repetitious Regions,DNAs, Selfish,Direct Repeats,Gene, Selfish,Repeat, Direct,Repeats, Direct,Repetitious Regions, DNA,Repetitive Regions,Repetitive Sequences,Selfish DNAs,Selfish Gene
D001937 Brassica A plant genus of the family Cruciferae. It contains many species and cultivars used as food including cabbage, cauliflower, broccoli, Brussel sprouts, kale, collard greens, MUSTARD PLANT; (B. alba, B. junica, and B. nigra), turnips (BRASSICA NAPUS) and rapeseed (BRASSICA RAPA). Broccoli,Brussel Sprout,Cabbage,Cauliflower,Collard Green,Kale,Cabbages,Collard Greens
D002503 Centromere The clear constricted portion of the chromosome at which the chromatids are joined and by which the chromosome is attached to the spindle during cell division. Centromeres
D016615 Telomere A terminal section of a chromosome which has a specialized structure and which is involved in chromosomal replication and stability. Its length is believed to be a few hundred base pairs. Telomeres
D017360 Arabidopsis A plant genus of the family BRASSICACEAE that contains ARABIDOPSIS PROTEINS and MADS DOMAIN PROTEINS. The species A. thaliana is used for experiments in classical plant genetics as well as molecular genetic studies in plant physiology, biochemistry, and development. Arabidopsis thaliana,Cress, Mouse-ear,A. thaliana,A. thalianas,Arabidopses,Arabidopsis thalianas,Cress, Mouse ear,Cresses, Mouse-ear,Mouse-ear Cress,Mouse-ear Cresses,thaliana, A.,thaliana, Arabidopsis,thalianas, A.
D042822 Genomic Instability An increased tendency of the GENOME to acquire MUTATIONS when various processes involved in maintaining and replicating the genome are dysfunctional. Genome Instability,Genome Stability,Genomic Stability,Genome Instabilities,Genome Stabilities,Genomic Instabilities,Genomic Stabilities,Instabilities, Genome,Instabilities, Genomic,Instability, Genome,Instability, Genomic,Stabilities, Genome,Stabilities, Genomic,Stability, Genome,Stability, Genomic
D018626 Retroelements Elements that are transcribed into RNA, reverse-transcribed into DNA and then inserted into a new site in the genome. Long terminal repeats (LTRs) similar to those from retroviruses are contained in retrotransposons and retrovirus-like elements. Retroposons, such as LONG INTERSPERSED NUCLEOTIDE ELEMENTS and SHORT INTERSPERSED NUCLEOTIDE ELEMENTS do not contain LTRs. MDG1 Retrotransposons,Mobile Dispersed Genetic Elements,Retroposons,Retrotransposons,Retrovirus-like Elements,Ty1 Transposon,Element, Retrovirus-like,Elements, Retrovirus-like,MDG1 Retrotransposon,Retroelement,Retroposon,Retrotransposon,Retrotransposon, MDG1,Retrotransposons, MDG1,Retrovirus like Elements,Retrovirus-like Element,Transposon, Ty1,Transposons, Ty1,Ty1 Transposons
D018745 Genome, Plant The genetic complement of a plant (PLANTS) as represented in its DNA. Plant Genome,Genomes, Plant,Plant Genomes
D019143 Evolution, Molecular The process of cumulative change at the level of DNA; RNA; and PROTEINS, over successive generations. Molecular Evolution,Genetic Evolution,Evolution, Genetic

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