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Asian-Australas J Anim Sci > Volume 18(5); 2005 > Article
Animal Products
Asian-Australasian Journal of Animal Sciences 2005;18(5): 723-727.
DOI: https://doi.org/10.5713/ajas.2005.723    Published online November 25, 2005.
Characteristics of Gene Structure of Bovine Ghrelin and Influence of Aging on Plasma Ghrelin
K. Kita, K. Harada, K. Nagao, H. Yokota
Abstract
Ghrelin is a novel growth-hormone-releasing acylated peptide, which has been purified and identified in rat stomach. In the present study, the full-length sequence of bovine ghrelin cDNA was cloned by RT-PCR. The bovine ghrelin cDNA sequence derived in the present study included a 348 bp open reading frame and a 137 bp 3''''UTR. The putative amino acid sequence of bovine prepro-ghrelin consisted of 116 amino acids, which contained the 27-amino acid ghrelin. The sequence analysis of the bovine ghrelin gene revealed that an intron existed between Gln13 and Arg14 of ghrelin. This exon-intron boundary matched the GT-AG rule of the splicing mechanism. Compared with rats, which have two tandem CAG sequences in the 3`-end of intron, bovine ghrelin genome has only one CAG sequence. Therefore, although rats can produce 28 amino acid-ghrelin and 27 amino acid-des-Gln14-ghrelin by alternative splicing, ruminant species, including bovines, might be able to produce only one type of ghrelin peptide, des-Gln14-ghrelin. The influence of aging on plasma ghrelin concentration was also examined. Plasma ghrelin concentration increased after birth to approximately 600 days of age, and then remained constant.
Keywords: Ghrelin; cDNA; Genomic DNA; Plasma Concentration; Cattle
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