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|標題:||Growth enhancement of fowls by dietary administration of recombinant yeast cultures containing enriched growth hormone||作者:||Chen, C.M.
|關鍵字:||fowl;yeast culture;recombinant growth hormone;Pichia pastoris;pichia-pastoris strains;high-level expression;methylotrophic yeast;salmo-gairdneri;gene;swine;performance;secretion;campylobacter;implantation||Project:||Life Sciences||期刊/報告no：:||Life Sciences, Volume 67, Issue 17, Page(s) 2103-2115.||摘要:||
In present study the methylotrophic yeast, Pichia pastoris, was used to express a recombinant growth hormone (rGH) gene of swine, A synthetic secretion cassette was constructed using the promoter of the alcohol oxidase1 gene (AOX1), and a alpha-factor signal peptide. After electroporatic transformation and zeocin selection, several clones exhibited high levels of rGH protein expression constituting more than 20% of total yeast protein. Over 95% of rGH was shown to be export into the culture supernatant, Yeast transformant containing the highest recombinant growth hormone level (rGH yeast) and native GS115 Pichia pastoris (non-rGH yeast, as a control) were separately cultured, harvested and adsorbed by wheat bran, Yeast cultures of four dosages (0.05, 0.1, 0.2, and 0.4%) were mixed respectively with chick basal diet and fed to simulated country chickens for 9 weeks. The results showed that, when compared to control chicks, the percentage of body weight gain was improved significantly (P<0.05) in chicks fed with diets containing 0.1 or 0.2% rGH-rich yeast culture at brooding stage, and in chicks fed with 0.4% rGH-rich yeast culture at growing stage. The average weight gain in rGH yeast treated groups for the full-term (0 to 63d) and short term (43 to 63d) of growth were 10.6 and 9.4%, respectively, better than the non-rGH yeast control group. These experimental data suggest that the use of rGH-containing yeast as a supplement in fed provided an alternative approach for growth improvement in simulated country chickens. (C) 2000 Elsevier Science Inc. All rights reserved.
|Appears in Collections:||生命科學系所|
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