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<dc:title xml:lang="fr">Variation de l’expression génique au cours de l’hibernation du hamster d’Europe : un rôle des récepteurs à la mélatonine ?</dc:title>
<dcterms:alternative xml:lang="en">Gene expression profiling during hibernation in the European hamster : roles of melatonin receptors ?</dcterms:alternative>
<dc:subject xml:lang="fr">Variation expression génique</dc:subject>
<dc:subject xml:lang="fr">Digital droplet PCR</dc:subject>
<dc:subject xml:lang="fr">Hibernation</dc:subject>
<dc:subject xml:lang="fr">Cricetus cricetus</dc:subject>
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<dc:subject xml:lang="en">Gene expression</dc:subject>
<dc:subject xml:lang="en">Digital droplet PCR</dc:subject>
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<dc:subject xml:lang="en">Digital droplet PCR</dc:subject>
<dc:subject xml:lang="en">Melatonin receptors</dc:subject>
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<dcterms:abstract xml:lang="fr">Afin de faire face aux conditions environnementales défavorables, certains animaux réduisent drastiquement leur activité métabolique et leur température grâce à des phases de torpeur hivernal. L’objectif de cette étude est d’établir une signature moléculaire de chacune des phases d’hibernation. Pour cela, les variations d’expression de 21 gènes impliqués dans le contrôle des fonctions saisonnières (horloge circadienne, hormones thyroïdiennes, récepteurs à la mélatonine) et le métabolisme ont été étudiées dans 8 organes. Les résultats ont mis en évidence une augmentation ubiquitaire de l’expression des gènes Périodes indiquant un possible réajustement de l’horloge au début de la phase de réveil. Ainsi qu’une régulation spécifique des déiodinases induisant une augmentation de la synthèse de thyroxine dans le tissu adipeux brun et l’hypothalamus pendant la torpeur et le réveil. Le récepteur MT2 du hamster d’Europe a été partiellement caractérisé génétiquement et pharmacologiquement. A la différence d’autres espèces de hamster dont le récepteur MT2 est tronqué, le récepteur étudié semble être fonctionnel pour la mélatonine et pourrait être critique durant l’hibernation.</dcterms:abstract>
<dcterms:abstract xml:lang="en">Living in the wild involves to cope with a variable seasonal environment availability. When winter is coming, animals use various strategies to adapt to hostile environment by limiting energy expenditure such as hibernation. In this study, expression of 21 selected genes was compared at different states of the hibernation cycle of the true hibernator European hamster. Level of mRNA encoding proteins involved in seasonal timing (melatonin receptors, thyroid metabolism, clock) and energy homeostasis were measured by digital droplet PCR in eight central and peripheral organs. During the arousal phase, Periods genes expression is increased in all organs indicating a possible resetting of body’s clocks at the beginning of the active period. The brown adipose tissue displays a specific regulation of deiodinases leading to increased synthesis of thyroxine during both torpor and arousal. The melatonin receptor MT2 of the European hamster had been partially cloned and pharmacologically characterized. While in most hamster species, MT2 is a natural knock out, the studied receptor seems to be functional and could be critical during hibernation.</dcterms:abstract>
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