Animal Bioscience

Asian Australasian Association of Animal Production Societies (아세아태평양축산학회)
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Regulation of chicken vanin1 gene expression by peroxisome proliferators activated receptor α and miRNA-181a-5p

  • Wang, Zhongliang (School of Biology and Food Engineering, Changshu Institute of Technology) ;
  • Yu, Jianfeng (School of Biology and Food Engineering, Changshu Institute of Technology) ;
  • Hua, Nan (School of Biology and Food Engineering, Changshu Institute of Technology) ;
  • Li, Jie (School of Biology and Food Engineering, Changshu Institute of Technology) ;
  • Xu, Lu (School of Biology and Food Engineering, Changshu Institute of Technology) ;
  • Yao, Wen (College of Animal Science and Technology, Nanjing Agricultural University) ;
  • Gu, Zhiliang (School of Biology and Food Engineering, Changshu Institute of Technology)
  • Received : 2019.12.31
  • Accepted : 2020.03.30
  • Published : 2021.02.01
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Abstract

Objective: Vanin1 (VNN1) is a pantetheinase that can catalyze the hydrolysis of pantetheine to produce pantothenic acid and cysteamine. Our previous studies showed that VNN1 is specifically expressed in chicken liver. In this study, we aimed to investigate the roles of peroxisome proliferators activated receptor α (PPARα) and miRNA-181a-5p in regulating VNN1 gene expression in chicken liver. Methods: 5'-RACE was performed to identify the transcription start site of chicken VNN1. JASPAR and TFSEARCH were used to analyze the potential transcription factor binding sites in the promoter region of chicken VNN1 and miRanda was used to search miRNA binding sites in 3' untranslated region (3'UTR) of chicken VNN1. We used a knock-down strategy to manipulate PPARα (or miRNA-181a-5p) expression levels in vitro to further investigate its effect on VNN1 gene transcription. Luciferase reporter assays were used to explore the specific regions of VNN1 targeted by PPARα and miRNA-181a-5p. Results: Sequence analysis of the VNN1 promoter region revealed several transcription factor-binding sites, including hepatocyte nuclear factor 1α (HNF1α), PPARα, and CCAAT/enhancer binding protein α. GW7647 (a specific agonist of PPARα) increased the expression level of VNN1 mRNA in chicken primary hepatocytes, whereas knockdown of PPARα with siRNA increased VNN1 mRNA expression. Moreover, the predicted PPARα-binding site was confirmed to be necessary for PPARα regulation of VNN1 gene expression. In addition, the VNN1 3'UTR contains a sequence that is completely complementary to nucleotides 1 to 7 of miRNA-181a-5p. Overexpression of miR-181a-5p significantly decreased the expression level of VNN1 mRNA. Conclusion: This study demonstrates that PPARα is an important transcriptional activator of VNN1 gene expression and that miRNA-181a-5p acts as a negative regulator of VNN1 expression in chicken hepatocytes.

Keywords

References

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