||Bacca Helene1, Huvet Arnaud1, Fabioux Caroline1, Daniel Jean-Yves1, Delaporte Maryse1, Pouvreau Stephane1, Van Wormhoudt A2, Moal Jeanne1
||1 : IFREMER, Ctr Brest, UMR Physiol & Ecophysiol Mollusques Marins, F-29280 Plouzane, France.
2 : Museum Natl Hist Nat, Stn Biol Marine, UMR 5178, F-29900 Concarneau, France.
||Comparative Biochemistry and Physiology Part B: Biochemistry and Molecular Biology (1096-4959) (Elsevier), 2005-04 , Vol. 140 , N. 4 , P. 635-646
|WOS© Times Cited
||Reproduction, Regulation, Oyster, Glycogen, Expression, Gene, Energy, Crassostrea gigas, Bivalve
||To investigate the control at the mRNA level of glycogen metabolism in the cupped oyster Crassostrea gigas, we report in the present paper the cloning and characterization of glycogen phosphorylase and synthase cDNAs (Cg-GPH and Cg-GYS, respectively, transcripts of main enzymes for glycogen use and storage), and their first expression profiles depending on oyster tissues and seasons. A strong expression of both genes was observed in the labial palps and the gonad in accordance with specific cells located in both tissues and ability to store glucose. Cg-GPH expression was also found mainly in muscle suggesting ability to use glycogen as readily available glucose to. supply its activity. For seasonal examinations, expression of Cg-GYS and Cg-GPH genes appeared to be regulated according to variation in glycogen content. Relative levels of Cg-GYS transcripts appeared highest in October corresponding to glycogen storage and resting period. Relative levels of Cg-GPH transcripts were highest in May corresponding to mobilization of glycogen needed for germ cell maturation. Expression of both genes would likely be driven by the oyster's reproductive cycle, reflecting the central role of glycogen in energy storage and gametogenic development in C gigas. Both genes are useful molecular markers in the regulation of glycogen metabolism and reproduction in C gigas but enzymatic regulation of glycogen phosphorylase and synthase remains to be elucidated.