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Abstract Detail

Principles of crucifer evolution

Lysak, Martin A. [1], Mandakova, Terezie [1].

Karyotype evolution in the crucifers - mirroring the complex evolutionary patterns.

Comparative genetic and cytogenetic mapping studies across the Brassicaceae revealed astonishingly high levels of inter-species genome and chromosome collinearity. These comparisons allowed us to infer ancestral karyotypes,conserved genomic blocks, and to reconstruct crucial chromosomal alterations on the way to extant crucifer genomes. Ancestral Crucifer Karyotype (ACK) with eight linkage groups (n=8) is believed to be an ancestral genome in the lineageI and, most likely, in the lineage II through the Proto-Calepineae Karyotype(PCK) with seven chromosomes (n=7). Comparable data for lineage III and several unassigned tribes are lacking. In some crucifer groups and species, ancestral karyotypes remained remarkably stable through the time, whereas other taxa manifest karyotypic variation such as frequent chromosome number reductions(descending dysploidy). Apparently the extensive genetic, karyotypic and taxonomic variation in some tribes can be linked to multiple rounds of lineage-specific whole-genome duplication events and the multi-speed process of genome diploidization.

Broader Impacts:

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1 - CEITEC - Central European Institute of Technology, Masaryk University, Plant Cytogenomics, Kamenice 5, Brno, Czech Republic

karyotype evolution
chromosome collinearity
ancestral genomes
Whole Genome Duplications

Presentation Type: Symposium or Colloquium Presentation
Session: C4
Location: Delaware C/Hyatt
Date: Tuesday, July 10th, 2012
Time: 2:00 PM
Number: C4003
Abstract ID:276

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