Défense de thèse

Soutenance de thèse de Gwenaëlle Gain


Infos

Dates
23 septembre 2021
Lieu
Auditoire de l'Institut de Botanique
Quartier VALLEE 1 - Chemin de la Vallée, 4
4000 Liège (Sart Tilman)
Voir la carte
Horaires
13h30

Le jeudi 23 septembre 2021, Gwenaëlle GAIN présentera l'examen en vue de l’obtention du grade académique de Docteur en Sciences (Collège de doctorat en Biochimie, biologie moléculaire et cellulaire, bioinformatique et modélisation) sous la direction de Pierre CARDOL et Claire REMACLE.

Cette épreuve consistera en la défense publique d’une dissertation intitulée :

« Characterization of fermentation pathways and their interactions with photosynthesis in microalgae from different lineages : genetic, biophysical and proteomic approaches ».

Abstract

Oxygenic photosynthesis is the bioenergetic process that allows organisms to produce carbohydrates by capturing light energy and releasing oxygen in the atmosphere. This mechanism is based on the perfect integration between the assimilation of carbon dioxide and the conversion of light energy into chemical energy. In the ocean, phytoplankton species play an important role by realizing a large amount of oxygenic photosynthesis and by regulating carbon dioxide exchanges between the ocean and the atmosphere. It is usual for photosynthetic organisms to experience hypoxic or anoxic environments. Under these conditions, mitochondrial respiration is decreased or abolished, and anoxic fermentation pathways allow to maintain glycolytic activity by reducing alternative electrons acceptors while generating various fermentation by-products. In photosynthetic microeukaryotes, the study of anaerobic metabolic pathways is limited to few freshwater model microorganisms such as the green alga Chlamydomonas reinhardtii. By using different approaches (proteomic, biophysical, genetic), we improved our understanding on strategies and mechanisms developed by microalgae from different lineages to acclimate and survive in absence of oxygen.

 

Le Jury sera composé de :

M. M. HANIKENNE (Président), Mmes et MM. A. ATTEIA (Aix-Marseille Université), P. CARDOL (Promoteur), P. FICKERS (Secrétaire), M. JAUBERT (Sorbonne Université), T. LACOUR (IFREMER Nantes), C. REMACLE (Co-promotrice).

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