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Tandem repeats on an eco-geographical scale: outcomes from the genome of Aegilops speltoides.
Chromosome Res. 2011 Jul; 19(5):607-23.CR

Abstract

The chromosomal pattern of tandem repeat fractions of repetitive DNA is one of the most important characteristics of a species. In the present research, we aimed to detect and evaluate the level of intraspecific variability in the chromosomal distribution of species-specific Spelt 1 and Aegilops-Triticum-specific Spelt 52 tandem repeats in Aegilops speltoides and in closely related diploid and polyploid species. There is a distinct eco-geographical gradient in Spelt 1 and Spelt 52 blocks abundance in Ae. speltoides. In marginal populations, the number of Spelt 1 chromosomal blocks could be 12-14 times lower than in the center of the species distribution. Also, in related diploid species, the abundance of Spelt 52 correlates with evolutionary proximity to Ae. speltoides. Finally, the B- and G-genomes of allopolyploid wheats have Spelt 1 chromosomal distribution patterns similar to those of the types of Ae. speltoides with poor and rich contents of Spelt 1, respectively. The observed changes in numbers of blocks of Spelt 1 and Spelt 52 tandem repeats along the eco-geographical gradient may due to their depletion in the marginal populations as a result of increased recombination frequency under stressful conditions. Alternatively, it may be accumulation of tandem repeats in conducive climatic/edaphic environments in the center of the species' geographical distribution. Anyway, we observe a bidirectional shift of repetitive DNA genomic patterns on the population level leading to the formation of population-specific chromosomal patterns of tandem repeats. The appearance of a new chromosomal pattern is considered an important factor in promoting the emergence of interbreeding barriers.

Authors+Show Affiliations

Laboratory of Plant Molecular Cytogenetics, Institute of Evolution, University of Haifa, Mount Carmel, Haifa 31905, Israel. raskina@research.haifa.ac.ilNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

21656077

Citation

Raskina, Olga, et al. "Tandem Repeats On an Eco-geographical Scale: Outcomes From the Genome of Aegilops Speltoides." Chromosome Research : an International Journal On the Molecular, Supramolecular and Evolutionary Aspects of Chromosome Biology, vol. 19, no. 5, 2011, pp. 607-23.
Raskina O, Brodsky L, Belyayev A. Tandem repeats on an eco-geographical scale: outcomes from the genome of Aegilops speltoides. Chromosome Res. 2011;19(5):607-23.
Raskina, O., Brodsky, L., & Belyayev, A. (2011). Tandem repeats on an eco-geographical scale: outcomes from the genome of Aegilops speltoides. Chromosome Research : an International Journal On the Molecular, Supramolecular and Evolutionary Aspects of Chromosome Biology, 19(5), 607-23. https://doi.org/10.1007/s10577-011-9220-9
Raskina O, Brodsky L, Belyayev A. Tandem Repeats On an Eco-geographical Scale: Outcomes From the Genome of Aegilops Speltoides. Chromosome Res. 2011;19(5):607-23. PubMed PMID: 21656077.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Tandem repeats on an eco-geographical scale: outcomes from the genome of Aegilops speltoides. AU - Raskina,Olga, AU - Brodsky,Leonid, AU - Belyayev,Alexander, Y1 - 2011/06/08/ PY - 2011/02/16/received PY - 2011/05/12/accepted PY - 2011/04/21/revised PY - 2011/6/10/entrez PY - 2011/6/10/pubmed PY - 2011/12/15/medline SP - 607 EP - 23 JF - Chromosome research : an international journal on the molecular, supramolecular and evolutionary aspects of chromosome biology JO - Chromosome Res VL - 19 IS - 5 N2 - The chromosomal pattern of tandem repeat fractions of repetitive DNA is one of the most important characteristics of a species. In the present research, we aimed to detect and evaluate the level of intraspecific variability in the chromosomal distribution of species-specific Spelt 1 and Aegilops-Triticum-specific Spelt 52 tandem repeats in Aegilops speltoides and in closely related diploid and polyploid species. There is a distinct eco-geographical gradient in Spelt 1 and Spelt 52 blocks abundance in Ae. speltoides. In marginal populations, the number of Spelt 1 chromosomal blocks could be 12-14 times lower than in the center of the species distribution. Also, in related diploid species, the abundance of Spelt 52 correlates with evolutionary proximity to Ae. speltoides. Finally, the B- and G-genomes of allopolyploid wheats have Spelt 1 chromosomal distribution patterns similar to those of the types of Ae. speltoides with poor and rich contents of Spelt 1, respectively. The observed changes in numbers of blocks of Spelt 1 and Spelt 52 tandem repeats along the eco-geographical gradient may due to their depletion in the marginal populations as a result of increased recombination frequency under stressful conditions. Alternatively, it may be accumulation of tandem repeats in conducive climatic/edaphic environments in the center of the species' geographical distribution. Anyway, we observe a bidirectional shift of repetitive DNA genomic patterns on the population level leading to the formation of population-specific chromosomal patterns of tandem repeats. The appearance of a new chromosomal pattern is considered an important factor in promoting the emergence of interbreeding barriers. SN - 1573-6849 UR - https://www.unboundmedicine.com/medline/citation/21656077/Tandem_repeats_on_an_eco_geographical_scale:_outcomes_from_the_genome_of_Aegilops_speltoides_ L2 - https://doi.org/10.1007/s10577-011-9220-9 DB - PRIME DP - Unbound Medicine ER -