Abstract


PHAEODACTYLUM TRICORNUTUM, A MODEL SYSTEM FOR STUDYING THE GENETIC AND EPIGENETIC BASES OF ADAPTATION IN OCEANIC PLANKTON COMMUNITIES

The ocean is a dynamic environment that supports the life of countless numbers of species, including phytoplankton that are crucial to the well-being of the Earth’s ecosystem. They are the base of the food chain, produce half of the world’s oxygen, and export carbon dioxide from the atmosphere into the ocean interior. Diatoms are a very diverse group of eukaryotic phytoplankton that have grown to prominence in the last 30 million years and are likely to be responsible for at least 25% of oceanic primary production. The ecological success of diatoms in contemporary oceans is unlikely to be explained only by genetic-based mechanisms because they are likely to be too slow to allow them to cope with highly dynamic and changing environments. Epigenetic regulation mechanisms, dependent on post-translational modifications of histones, DNA methylation, and small RNAs, may therefore represent highly relevant processes in regulating the adaptive dynamics of these organisms. In order to address such a question, we use Phaeodactylum tricornutum and present here its chromatin and genomic landscapes. It displays a full complement of epigenetic marks, in some contexts showing features described previously in animals and/or plants, and in other contexts being highly novel. We believe that diatoms such as P. tricornutum represent an emerging model system for linking evolution and ecology that can be used to address the nature of adaptive dynamics in marine planktonic ecosystems.

Authors

VELUCHAMY, A., Institut de Biologie de l'Ecole Normale Supérieure CNRS UMR 8197, France, velucham@biologie.ens.fr

RASTOGI, A., Institut de Biologie de l'Ecole Normale Supérieure CNRS UMR 8197, France

LIN, X., Institut de Biologie de l'Ecole Normale Supérieure CNRS UMR 8197, France

THOMAS, Y., Institut de Biologie de l'Ecole Normale Supérieure CNRS UMR 8197, France

MURIK, O., Institut de Biologie de l'Ecole Normale Supérieure CNRS UMR 8197, France, tirichin@biologie.ens.fr

LOMBARD, B., Protein mass spectrometry laboratory, Institut Curie, France

Loew, D., Protein mass spectrometry laboratory, Institut Curie, France

Allen, A. E., Craig Venter Institute, San Diego, California, USA

BOWLER, C., Institut de Biologie de l'Ecole Normale Supérieure CNRS UMR 8197, France

TIRICHINE, L., Institut de Biologie de l'Ecole Normale Supérieure CNRS UMR 8197, France, tirichin@biologie.ens.fr

Details

Oral presentation

Session #:075
Date: 2/26/2015
Time: 17:45
Location: Andalucia 1 (Floor 1)

Presentation is given by student: No