Biotechnology Bulletin ›› 2021, Vol. 37 ›› Issue (6): 171-180.doi: 10.13560/j.cnki.biotech.bull.1985.2021-0224

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Effects of Dietary Protein Deficiency Followed by Realimentation on the Antioxidation of Lamb Based on Transcriptomics Analysis

KANG Ling-yun1(), CHEN Jian-sheng2, GAN Han-ling2, HAN Lu-lu1, FENG Hai-xia3, DIAO Qi-yu1, XING Kai2, CUI Kai1()   

  1. 1. Feed Research Institute,Chinese Academy of Agricultural Sciences,Key Laboratory of Feed Biological of Ministry of Agriculture,Beijing 100081
    2. Beijing University of Agriculture,Beijing 102206
    3. Agricultural and Rural Bureau of Lingcheng District,Dezhou 253500
  • Received:2021-02-26 Online:2021-06-26 Published:2021-07-08
  • Contact: CUI Kai E-mail:18821622269@163.com;cuikai@caas.cn

Abstract:

This study is aimed to investigate the effects of dietary protein deficiency followed by realimentation on the antioxidation of lamb based on RNA-seq analysis at transcriptome level. Thirteen-two Hu twin lambs weaned on 15 d were selected and randomly divided into two groups. The control group was fed milk replacer(CP 25%)and starter(CP 21%)of normal protein level(NPL),and the other group fed milk replacer(19%)and starter(15%)of low protein level(LPL). Milk replacer was fed from weaning to d 60,and starter was freely taken. LPL group of 60-90 d freely took the starter of normal protein level(CP 21%). Two 60 and 90 d lambs in each group were selected and slaughtered for tissue collection. RNA-seq technology was used to identify the difference expression genes(DEGs)in liver tissue under dietary protein deficiency followed by realimentation,to screen pathways closely related to antioxidant function through bioinformatics analysis,and to verify the expressions of genes of antioxidant enzymes using qRT-PCR method. Low level protein diet led to 302 differentially expressed genes(DEGs)in the sheep liver and 23 down regulated genes involved in antioxidant process. GO analysis showed that DEGs were mainly involved in oxidoreductase activity(GO:0016491),glutathione transferase activity(GO:0004364)and oxidation-reduction process(GO:0055114). KEGG analysis discovered that antioxidant related genes were enriched in metabolism of xenobiotics by cytochrome P450 and glutathione metabolism. The expression of genes involved in cytokine-cytokine receptor interaction was significantly up-regulated. Compared with NPL group,the expressions of genes related to antioxidation showed no significant difference after protein realimentation for 30 d. In conclusion,protein deficiency led to the changes of liver gene expression,decreased the expressions of genes related to antioxidation. The DEGs affect the antioxidation and immune function of liver via pathways of xenobiotics metabolism,glutathione metabolism,and cytokine-cytokine receptor.

Key words: protein realimentation, lamb, RNA-seq, antioxidation