Plant Phylogenomics: Defining Synergies Between Plant Systematics and Genome Biology
Pires, J. Chris .
Emerging paradigms and practices in phylogenomics: comparative biology in the Brassicaceae.
The integration of phylogenetics and genomics span both macro- and micro-evolutionary phenomena in the Brassicaceae. At the macro-evolutionary scale, new insights into the comparative phylogenomics of the crucifer family have been facilitated by several recent advances. First, a comprehensive phylogenetic framework for the family has emerged that identifies 25 tribes and reveals surprising relationships on which to base future comparative studies. Second, the integration of genetic maps of several species has led to the identification of ca. 24 conserved chromosomal blocks that has led to models of chromosome evolution for several crucifer genomes. Third, advances in comparative chromosome painting allow for the visualization of chromosomal blocks in non-model taxa and the rapid detection of duplication events and subsequent rearrangements. At the micro-evolutionary scale, natural variation within species is being explored using the genomic tools available with the complete sequence of Arabidopsis, Brassica, and other taxa. Brassica oleracea in particular displays extraordinary morphological diversity (broccoli, cabbage, cauliflower, kale, and brussel sprouts). A phylogenomic approach that identifies orthologs and paralogs coupled with functional analyses of paleopolyploid Brassica crops has led to the detection of tissue-specific gene expression differences among and between these morphotypes. To develop a conceptual framework to better understanding the link between phenotypic plasticity and genome redundancy, detailed phylogenomic comparisons of 30 genomic regions (10 singletons, 10 duplicates, and 10 triplicates) across Brassica oleracea, Brassica rapa, Sisymbrium irio, and Arabidopsis are underway.
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1 - University of Missouri, Biological Sciences, 1201 Rollins Road, 311 Life Sciences Center, Columbia, Missouri, 65211, USA
Presentation Type: Symposium or Colloquium Presentation
Location: Stevens 2/Hilton
Date: Monday, July 9th, 2007
Time: 8:00 AM