Inter genotype differences in expression of genes involved in glucose metabolism in the establishment of hepatic steatosis in Muscovy, Pekin and mule ducks
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In waterfowls, overfeeding leads to a hepatic steatosis, also called “foie gras”. Our main objectives were to determine what is the share of genes involvement of glucose metabolism in the establishment of fatty liver in three genotypes of waterfowls: Muscovy (Cairina moschata), Pekin ducks (Anas platyrhynchos) and their crossbreed, the mule duck. 288 male ducks of Pekin, Muscovy and mule genotypes were reared until weeks 12 and overfed between weeks 12 and 14. We analysed gene expression at the beginning, the middle and the end of the overfeeding period in different tissues. We have shown an upregulation of glucose transporters (GLUT) in peripheral tissues (pectoralis major or adipose tissue) in Pekin ducks. In addition, GLUT2 was not found in jejunal mucosa and another GLUT seems to replace it 3 h after the meal: GLUT3. Mule ducks upregulating GLUT3 earlier compared to Pekin ducks. However, these results need further investigations. In liver, globally, Pekin ducks exhibit the highest expression of GLUT or enzymes implicated in glycolysis. The few significant variations of gene expressions in glucose metabolism between these three genotypes and the momentary specific overexpression of GLUT do not allow us to detect a lot of specific genotype differences. To conclude, the differences in response to overfeeding of Pekin, Muscovy and mule ducks, for the establishment of hepatic steatosis, cannot be only explained by the glucose metabolism at transcriptomic level.
KeywordsHepatic steatosis Glucose metabolism Gene expression Ducks
We thank the “Conseil Général des Landes” and the “Comité Interprofessionnel des Palmipèdes à Foie Gras” (CIFOG) for financing this work. We also thank the technical staff of INRA Artiguères for rearing ducks (Certificate of Authorization to Experiment on Living animals, no. B40-037-1, Ministry of Agriculture and Fish Products, ethic committee Aquitaine birds and fish no. C2EA-73). We would also like to thank Frédéric Martins and Jean-José Maoret for performing Fluidigm analysis (Génopole Toulouse/Midi-Pyrénées, Plateau Transcriptomique Quantitative (TQ), Toulouse, France). We finally thanks Patrick Daniel, Karine Bellet and Martine Chague of the laboratory Pyrénées Landes (LPL, Mont de Marsan) to let us use their material.
Compliance with ethical standards
Conflict of interest
There is no conflict of interest.
All experimental procedures involving ducks were in accordance with the French National Guidelines for the care of animal for research purposes: Ethic committee 73, Comité d’éthique Aquitaine Poissons Oiseaux Project No. 01913.02.
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