title: Cloning and expression of the genes associated with lipid metabolism in Tsaiya ducks.
abstract: Sterol regulatory element binding protein 1 (SREBP1) drives the expression of several lipogenic genes, whereas SREBP2 dictates the expression of every gene involved in cholesterolgenesis in mammals. In the current study, we cloned the cDNA fragments for SREBP1, SREBP2, fatty acid synthase (FAS), 3-hydroxy-3-methylglutaryl-CoA reductase (HMG-CoA reductase), and very low density apolipoprotein-II (apoVLDL-II), the genes associated with lipid metabolism. Fifteen ducks immediately before the first egg was laid (18 wk old) and 15 ducks from the same population at an egg production rate of 80% were killed. Total RNA was extracted from liver and used to amplify the targeted genes by reverse transcription-PCR and screening of a cDNA library. The sequence data showed that Tsaiya duck SREBP1, SREBP2, FAS, and HMG-CoA reductase were highly homologous to that of chicken. Tsaiya duck SREBP1 mRNA was expressed in adipose tissue, cardiac muscle, skeletal muscle, liver, and ovary. The SREBP2 mRNA concentration was highest in liver and ovary. Concentrations of FAS and HMG-CoA reductase mRNA were high in liver and lower in other tissues. The apoVLDL-II mRNA was specifically expressed in the liver. The differences between mRNA concentrations of SREBP1, SREBP2, and FAS in the livers of laying and prelay ducks were not significant. However, the concentrations of hepatic HMG-CoA reductase and apoVLDL-II mRNA were higher in the laying ducks than in prelay ducks. Therefore, laying may affect particular aspects of lipid metabolism, especially biochemical pathways that involved apoVLDL-II and HMG-CoA reductase.
authors.affiliation: Department of Animal Science, National Taiwan University, Taipei, Taiwan.
authors.forename: C F
authors.initials: CF
authors.lastname: Yen
authors.forename: Y N
authors.initials: YN
authors.lastname: Jiang
authors.forename: T F
authors.initials: TF
authors.lastname: Shen
authors.forename: I M
authors.initials: IM
authors.lastname: Wong
authors.forename: C C
authors.initials: CC
authors.lastname: Chen
authors.forename: K C
authors.initials: KC
authors.lastname: Chen
authors.forename: W C
authors.initials: WC
authors.lastname: Chang
authors.forename: Y K
authors.initials: YK
authors.lastname: Tsao
authors.forename: S T
authors.initials: ST
authors.lastname: Ding
mesh_terms: D000273:Adipose Tissue / Q000737:chemistry; D000595:Amino Acid Sequence; D000818:Animals; D001053:Apolipoproteins / Q000737:chemistry / Q000235:genetics; D001483:Base Sequence; D022762:CCAAT-Enhancer-Binding Proteins / Q000235:genetics; D002784:Cholesterol / Q000096:biosynthesis; D003001:Cloning, Molecular; D018076:DNA, Complementary / Q000737:chemistry / Q000235:genetics; D004268:DNA-Binding Proteins / Q000235:genetics; D004372:Ducks / Q000235:genetics*; D064429:Fatty Acid Synthases / Q000235:genetics; D005260:Female; D015870:Gene Expression; D006903:Hydroxymethylglutaryl CoA Reductases / Q000235:genetics; D050356:Lipid Metabolism; D008055:Lipids / Q000235:genetics*; D008079:Lipoproteins, VLDL / Q000737:chemistry / Q000235:genetics; D008099:Liver / Q000737:chemistry; D008969:Molecular Sequence Data; D018482:Muscle, Skeletal / Q000737:chemistry; D009206:Myocardium / Q000737:chemistry; D016366:Open Reading Frames; D010053:Ovary / Q000737:chemistry; D012333:RNA, Messenger / Q000032:analysis; D020133:Reverse Transcriptase Polymerase Chain Reaction; D051780:Sterol Regulatory Element Binding Protein 1; D051782:Sterol Regulatory Element Binding Protein 2; D014157:Transcription Factors / Q000235:genetics
chemical_list: D001053:Apolipoproteins; D022762:CCAAT-Enhancer-Binding Proteins; D018076:DNA, Complementary; D004268:DNA-Binding Proteins; D008055:Lipids; D008079:Lipoproteins, VLDL; D012333:RNA, Messenger; D051780:Sterol Regulatory Element Binding Protein 1; D051782:Sterol Regulatory Element Binding Protein 2; D014157:Transcription Factors; C027610:apolipoprotein VLDL II; D002784:Cholesterol; D006903:Hydroxymethylglutaryl CoA Reductases; D064429:Fatty Acid Synthases