Centromere locations and associated chromosome rearrangements in Arabidopsis lyrata and A. thaliana.

Genetics
Akira KawabeDeborah Charlesworth

Abstract

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 ch...Continue Reading

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Citations

Sep 16, 2010·Functional & Integrative Genomics·Lili QiBikram S Gill
Jun 7, 2008·Chromosome Research : an International Journal on the Molecular, Supramolecular and Evolutionary Aspects of Chromosome Biology·Nicolas PouillyEric Jenczewski
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Dec 21, 2017·BMC Genomics·Rong-Cai YangZhiqiu Hu

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