Borrowed Chloroplasts: Secondary Endosymbiosis and the Chromalveolates
braun, edward , Phillips, Naomi , Bhattacharya, Debashish .
Phylogenomics and secondary plastids: A look back and a look ahead.
Despite their taxonomic diversity and ecological importance, photosynthetic organisms that acquired their plastids through secondary endosymbiosis remain poorly studied from a genomic standpoint. This talk reviews the current framework for phylogenomic studies of organisms that obtained chloroplasts through secondary endosymbiosis, with a special focus on examples from the chromalveolates. The chromalveolates, a hypothetical group defined by secondary chloroplasts of red algal origin, include the groups like the brown algae and the diatoms. Our group has been conducting surveys of the brown algae and the closely related class Schizocladiophyceae. Despite the growing amount of genomic information about the chromalveolates, there remain a large number of questions about the evolution of their genomes. A large number of chloroplast genomes and even a few nuclear genomes are now available for these organisms, but the fact that their diversity remains poorly sampled suggests that multiple approaches need to be applied to this problem. The relatively inexpensive methods we are applying to brown algae and their relative, which have primarily focused on the acquisition of expressed sequence tags (ESTs) have substantial potential to answer questions, and the potential uses of novel high-throughput technologies will be discussed. Both the methodological challenges and the opportunities for future phylogenomic analyses of these groups will be emphasized.
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1 - University of Florida, Zoology, Bartrum Hall, Gainesville, FL, United States
2 - Arcadia University, 450 S. Easton RD, Glenside, pA, 19038, united States
3 - University of Iowa, Department of Biological Sciences and Roy J. Carver Center for Comparative Genomics, 446 Biology Building, Iowa City, Iowa, 52242, USA
Presentation Type: Symposium or Colloquium Presentation
Location: Waldorf Room/Hilton
Date: Wednesday, July 11th, 2007
Time: 8:00 AM