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Effects of Growth Hormone Gene Polymorphism on Lipogenic Gene Expression Levels in Diaphragm Tissues of Japanese Black Heifers

  • Ardiyanti, Astrid (Department of Animal Physiology, Graduate School of Agricultural Science, Tohoku University) ;
  • Abe, Tsuyoshi (National Livestock Breeding Center) ;
  • Tameoka, Nanae (National Livestock Breeding Center) ;
  • Kobayashi, Eiji (National Livestock Breeding Center) ;
  • Shoji, Noriaki (Yamagata General Agricultural Research Center) ;
  • Ohtani, Yoshihisa (Department of Animal Physiology, Graduate School of Agricultural Science, Tohoku University) ;
  • Suzuki, Keiichi (Department of Animal Breeding and Genetics, Graduate School of Agricultural Science, Tohoku University) ;
  • Roh, Sang-Gun (Department of Animal Physiology, Graduate School of Agricultural Science, Tohoku University) ;
  • Katoh, Kazuo (Department of Animal Physiology, Graduate School of Agricultural Science, Tohoku University)
  • Received : 2012.01.13
  • Accepted : 2012.05.01
  • Published : 2012.08.01

Abstract

Two SNPs, i.e. L127V and T172M, of bovine growth hormone (GH) causing the presence of GH gene haplotypes A, B, and C was previously shown to alter intramuscular fatty acid (FA) composition in Japanese Black (JB) heifers. To determine the SNP effect on somatotropic hormone concentration and lipogenesis, we measured plasma GH, insulin, and insulin-like growth factor-1 (IGF-1) concentrations. We also measured mRNA levels of fatty acid synthase (FASN), stearoyl-coA desaturase (SCD), and sterol regulatory element binding proteins-1 (SREBP-1) and FA composition in diaphragm tissues. Heifers with genotype CC had the lowest plasma insulin concentration and FASN and SCD mRNA levels among genotypes. FASN mRNA levels in haplotype A tended to positively correlate with saturated FA (SFA) content and negatively correlated with C18:2 and unsaturated FA (USFA) contents. SCD mRNA levels in haplotype A positively correlated with monounsaturated FA (MUFA) contents and negatively correlated with C18:0 content. They also tended to positively correlate with C16:1, C18:1, and USFA contents and USFA/SFA ratio and negatively correlate with SFA content. Taken together, GH gene polymorphism affects the lipogenic genes expression levels and their relationships with fatty acid compositions in diaphragm tissues of JB heifers at 31 months of age.

Keywords

Japanese Black Heifers;GH Gene Polymorphism;Fatty Acid Synthase;Stearoyl-coA Desaturase;Sterol Regulatory Element Binding Proteins-1;Gene Expression Levels

References

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