ACTA VETERINARIA ET ZOOTECHNICA SINICA ›› 2018, Vol. 49 ›› Issue (4): 667-674.doi: 10.11843/j.issn.0366-6964.2018.04.002

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Analysis of the Promoter Activity and Expression Regulation of Porcine Nhlh2 Gene

WEN Li-juan1, LIU Fa-wei1, LIN Chang-guang2, CHEN Zi-tao1, ZHANG Zhe1, ZHANG Hao1, LI Jia-qi1, YUAN Xiao-long1*   

  1. 1. College of Animal Science, South China Agricultural University, Guangzhou 510642, China;
    2. Fujian Guanghua BEST Eco-agriculture and Animal Husbandry Development Co. Ltd., Sanming 365106, China
  • Received:2017-10-10 Online:2018-04-23 Published:2018-04-23

Abstract:

The present study aimed to explore the promoter activity of Nhlh2 gene and the relationship between the promoter activity and transcription factors in cells, and further provide a theoretical basis for the regulating mechanism of Nhlh2 gene in pigs. Based on the template of porcine ovarian genomic DNA, PCR was used to amplify different length deletion fragments of Nhlh2 gene promoter. These fragments were cloned into pGL3-basic to build the promoter recombinant plasmid, and then were transfected into the porcine ovarian granulosa cells. The relative luciferase activities of these plasmids were further measured by using the dual luciferase assay system. Chromatin immunoprecipitation assay (ChIP) was used to confirm the interaction between YY1, C/EBPβ and the promoter of Nhlh2. Finally, the overexpression and mutant vectors, small interfering RNA (siRNA) of YY1 and C/EBPβ were constructed, the luciferase activity was detected by dual luciferase reporter assay system. Results showed that transcription activity of P7 (—238-+129) region was the highest, —654-—238 was the potential region containing the negative regulatory element, and —238-—20 was the potential region containing the positive regulatory element; After the bioinformatic analysis and ChIP test, we found the binding sites of YY1 and C/EBPβ at Nhlh2 gene promoter were —101-—85 and —153-—140, respectively. After mutating the binding sites of YY1 and C/EBPβ, the transcription activity of P7 was significantly up-regulated; The overexpression of YY1 and C/EBPβ significantly reduced the transcription activity of P7, and the transcription activity was significantly up-regulated by YY1-siRNA and C/EBPβ-siRNA. These results indicate that the core promoter region of Nhlh2 is —238-+129. Furthermore, YY1 and C/EBPβ respectively bound at —101-—85 and —153-—140 of Nhlh2 gene promoter to inhibit the transcription of Nhlh2 gene in pigs.

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