title: Remodelling of the hepatic epigenetic landscape of glucose-intolerant rainbow trout (Oncorhynchus mykiss) by nutritional status and dietary carbohydrates.
abstract: The rainbow trout, a carnivorous fish, displays a 'glucose-intolerant' phenotype revealed by persistent hyperglycaemia when fed a high carbohydrate diet (HighCHO). Epigenetics refers to heritable changes in gene activity and is closely related to environmental changes and thus to metabolism adjustments governed by nutrition. In this study we first assessed in the trout liver whether and how nutritional status affects global epigenome modifications by targeting DNA methylation and histone marks previously reported to be affected in metabolic diseases. We then examined whether dietary carbohydrates could affect the epigenetic landscape of duplicated gluconeogenic genes previously reported to display changes in mRNA levels in trout fed a high carbohydrate diet. We specifically highlighted global hypomethylation of DNA and hypoacetylation of H3K9 in trout fed a HighCHO diet, a well-described phenotype in diabetes. g6pcb2 ohnologs were also hypomethylated at specific CpG sites in these animals according to their up-regulation. Our findings demonstrated that the hepatic epigenetic landscape can be affected by both nutritional status and dietary carbohydrates in trout. The mechanism underlying the setting up of these epigenetic modifications has now to be explored in order to improve understanding of its impact on the glucose intolerant phenotype in carnivorous teleosts.
authors: INRA, Univ Pau &Pays Adour, UMR 1419, Nutrition, Metabolism and Aquaculture, Saint Pée sur Nivelle, F-64310, France.
authors: Lucie
authors: L
authors: Marandel
authors: INRA, UMR 1224, Ecologie Comportementale et Biologie des Populations de Poissons, Saint Pée sur Nivelle, F-64310, France.|Univ Pau &Pays Adour, UMR 1224, Ecologie Comportementale et Biologie des Populations de Poissons, UFR Sciences et Techniques de la Côte Basque, Anglet, F-64600, France, Anglet, F-64600, France.
authors: Olivier
authors: O
authors: Lepais
authors: INRA, Univ Pau &Pays Adour, UMR 1419, Nutrition, Metabolism and Aquaculture, Saint Pée sur Nivelle, F-64310, France.
authors: Eva
authors: E
authors: Arbenoits
authors: INRA, Univ Pau &Pays Adour, UMR 1419, Nutrition, Metabolism and Aquaculture, Saint Pée sur Nivelle, F-64310, France.
authors: Vincent
authors: V
authors: Véron
authors: INRA, Univ Pau &Pays Adour, UMR 1419, Nutrition, Metabolism and Aquaculture, Saint Pée sur Nivelle, F-64310, France.
authors: Karine
authors: K
authors: Dias
authors: INRA, Univ Pau &Pays Adour, UMR 1419, Nutrition, Metabolism and Aquaculture, Saint Pée sur Nivelle, F-64310, France.
authors: Marie
authors: M
authors: Zion
authors: INRA, Univ Pau &Pays Adour, UMR 1419, Nutrition, Metabolism and Aquaculture, Saint Pée sur Nivelle, F-64310, France.
authors: Stéphane
authors: S
authors: Panserat
mesh_terms: D000818:Animals; D004040:Dietary Carbohydrates / Q000494:pharmacology*; D044127:Epigenesis, Genetic / Q000187:drug effects*; D029941:Fish Proteins / Q000096:biosynthesis*; D008099:Liver / Q000378:metabolism*; D009752:Nutritional Status / Q000187:drug effects*; D017686:Oncorhynchus mykiss / Q000378:metabolism*
chemical_list: D004040:Dietary Carbohydrates; D029941:Fish Proteins