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Centromere Locations and Associated Chromosome Rearrangements in Arabidopsis lyrata and A. thaliana
Institute of Evolutionary Biology, University of Edinburgh, Edinburgh, United Kingdom.
Institute of Evolutionary Biology, University of Edinburgh, Edinburgh, United Kingdom.
Institute of Evolutionary Biology, University of Edinburgh, Edinburgh, United Kingdom.
Institute of Evolutionary Biology, University of Edinburgh, Edinburgh, United Kingdom.
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2006 (English)In: Genetics, ISSN 0016-6731, E-ISSN 1943-2631, Vol. 173, no 3, 1613-1619 p.Article in journal (Refereed) Published
Abstract [en]

We analyzed linkage and chromosomal positions of genes in A. lyrata ssp. petraea that are located near the centromere (CEN) regions of A. thaliana, using at least two genes from the short and long arms of each chromosome. In our map, genes from all 10 A. thaliana chromosome arms are also tightly linked in A. lyrata. Genes from the regions on the two sides of CEN5 have distant map localizations in A. lyrata (genes on the A. thaliana short-arm genes are on linkage group AL6, and long-arm genes are on AL7), but genes from the other four A. thaliana centromere regions remain closely linked in A. lyrata. The observation of complete linkage between short- and long-arm centromere genes, but not between genes in other genome regions that are separated by similar physical distances, suggests that crossing-over frequencies near the A. lyrata ssp. petraea centromere regions are low, as in A. thaliana. Thus, the centromere positions appear to be conserved between A. thaliana and A. lyrata, even though three centromeres have been lost in A. thaliana, and the core satellite sequences in the two species are very different. We can now definitively identify the three centromeres that were eliminated in the fusions that formed the A. thaliana chromosomes. However, we cannot tell whether genes were lost along with these centromeres, because such genes are absent from the A. thaliana genome, which is the sole source of markers for our mapping.

Place, publisher, year, edition, pages
Baltimore, MD, USA: The Genetics Society, 2006. Vol. 173, no 3, 1613-1619 p.
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Natural Sciences
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URN: urn:nbn:se:liu:diva-35947DOI: 10.1534/genetics.106.057182ISI: 000239629400035Local ID: 29114OAI: oai:DiVA.org:liu-35947DiVA: diva2:256795
Available from: 2009-10-10 Created: 2009-10-10 Last updated: 2017-12-13Bibliographically approved

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Hagenblad, Jenny

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