Relations between membrane lipid structures and enzyme activities in mitochondria of oyster Crassostrea gigas
type: Dataset
description: First considered as simple components of an impermeable barrier, it has been shown that membrane lipids would have a more important biological role. These lipids could modify the environment of membrane enzymes and modulate their activity. In this thesis, these relationships have been studied in mitochondria of the oyster Crassostrea gigas. Bivalves undergo major environmental changes and adaptation to these changes may require a membrane remodelling, which makes these animals interesting models to study the relationship between membrane structure and membrane processes. In this study oysters were fed in hatchery with two monospecific algal diets, T-Iso and Chaetoceros gracilis, and an equilibrated mix of both algae. Despite significant changes in fatty acid composition induced by these diets, mitochondrial capacities remained stable. On the other hand, the comparison between hatchery-reared oysters and oysters reared in their natural environment revealed significant changes in mitochondrial capacity, which could be related to modulation of phospholipid class composition and unsaturation. These differences can not be explained by the influence of tidal cycles. Indeed, despite a change in ATP production, mitochondrial activity was shown to be similar in oysters collected during emersion and immersion.Mitochondrial homeostasis observed in this study could be a way for oysters to cope with biotic (food availability) and abiotic (oxygen availability) variations in the natural environment of C. gigas, and to maintain their physiological functions despite these variations.
identifier: NNT: 2013BRES0036
issued: 2026-05-05T18:48:10.685337
language: fr
modified: 2026-05-05T18:48:10.685341
contact point: Organization
  fn: CCSD
keyword: acides-gras
keyword: atp
keyword: crassostrea-gigas
keyword: enzymes-membranaires
keyword: experience-de-nutrition
keyword: fatty-acids
keyword: feeding-experiment
keyword: huitre
keyword: infoeu-reposemanticsdoctoralthesis
keyword: lipides-membranaires
keyword: membrane-enzymes
keyword: membrane-lipids
keyword: mitochondria
keyword: mitochondries
keyword: oxidative-phosphorylation
keyword: oyster
keyword: phosphorylation-oxydative
keyword: sdvbalife-sciences-q-bioanimal-biology
keyword: theses
landing page: https://theses.hal.science/tel-00969121

Relations between membrane lipid structures and enzyme activities in mitochondria of oyster Crassostrea gigas
type: Distribution
format: HTML
issued: 2026-05-05T18:48:10.687249
modified: 2026-05-05T18:48:10.650219
access URL: https://theses.hal.science/tel-00969121

test_moissonnage_selune
type: Agent