Comparative mapping of Arabidopsis thaliana and Brassica oleracea chromosomes reveals islands of conserved organization.

The chromosomes of Arabidopsis thaliana and Brassica oleracea have been extensively rearranged since the divergence of these species; however, conserved regions are evident. Eleven regions of conserved organization were detected, ranging from 3.7 to 49.6 cM in A. thaliana, spanning 158.2 cM (24.6%) of the A. thaliana genome, and 245 cM (29.9%) of the B. oleracea genome. At least 17 translocations and 9 inversions distinguish the genomes of A. thaliana and B. oleracea. In one case B. oleracea homoeologs show a common marker order, which is distinguished from the A. thaliana order by a rearrangement, indicating that the lineages of A. thaliana and B. oleracea diverged prior to chromosomal duplication in the Brassica lineage (for at least this chromosome). Some chromosomal segments in B. oleracea appear to be triplicated, indicating the need for reevaluation of a classical model for Brassica chromosome evolution by duplication. The distribution of duplicated loci mapped for about 13% of the DNA probes studied in A. thaliana suggests that ancient duplications may also have occurred in Arabidopsis. The degree of chromosomal divergence between A. thaliana and B. oleracea appears greater than that found in other confamilial species for which comparative maps are available.

Kowalski SP ，Lan TH ，Feldmann KA ，Paterson AH ... -  《GENETICS》

Chromosomal mapping of Brassica oleracea based on ESTs from Arabidopsis thaliana: complexity of the comparative map.

Babula D ，Kaczmarek M ，Barakat A ，Delseny M ，Quiros CF ，Sadowski J ... -  《-》

Contrasting genome organisation: two regions of the Brassica oleracea genome compared with collinear regions of the Arabidopsis thaliana genome.

Ryder CD ，Smith LB ，Teakle GR ，King GJ ... -  《GENOME》

An EST-enriched comparative map of Brassica oleracea and Arabidopsis thaliana.

Lan TH ，DelMonte TA ，Reischmann KP ，Hyman J ，Kowalski SP ，McFerson J ，Kresovich S ，Paterson AH ... -  《GENOME RESEARCH》

Gene for gene alignment between the Brassica and Arabidopsis genomes by direct transcriptome mapping.

Li G ，Gao M ，Yang B ，Quiros CF ... -  《THEORETICAL AND APPLIED GENETICS》