Acta Veterinaria et Zootechnica Sinica ›› 2023, Vol. 54 ›› Issue (9): 3689-3699.doi: 10.11843/j.issn.0366-6964.2023.09.010

• ANIMAL GENETICS AND BREEDING • Previous Articles     Next Articles

Identification and Transcriptional Regulation Analysis of Core Promoter of Bovine CART Gene

WANG Dongliang1, REN Jing2, HAO Qinqin2, LI Pengfei2*   

  1. 1. Shuozhou Vocational Technology College, Shuozhou 036002, China;
    2. College of Life Science, Shanxi Agricultural University, Taigu 030801, China
  • Received:2023-03-24 Published:2023-09-22

Abstract: The present study aimed to screen the core promoter of bovine CART gene and identify the transcription factors regulating CART expression, and explore its transcriptional regulation mechanism.The hypothalamus of 3 healthy cow were collected for genomic DNA extraction. The promoter of bovine CART gene was obtained through PCR amplification and clone sequencing, and its sequence characteristics were analyzed by EMBOSS, MethPrimer, New PLACE database. The 4 CART gene promoter reporter vectors containing different truncated lengths were constructed to identify the core promoter region by dual luciferase reporter gene activity assay. DNA pull down and mass spectrometry, functional cluster and binding site prediction analysis were used to screen the candidate transcription factors in the core promoter region (n=3). The transcription factors overexpression vectors were constructed and transfected to 293T cells to analyze the regulatory function of transcription factors on bovine CART gene transcription (n=3). The results showed that there were CpG island and cis-acting elements such as TATA box and CAAT box in the -1 200 bp-+22 bp region of bovine CART gene. All the 4 reporter vectors with truncated promoters had transcription initiation activity and the -292 bp-+22 bp was the highest, this region was the core promoter of bovine CART gene. RFX5, CREB, RFX1, JUND, TEAD4, TFAP2D, RELA could specifically bind to the core promoter region of the bovine CART gene. Furthermore, it was proved that RFX5, RFX1, TEAD4 could inhibit CART gene transcription (P<0.01); CREB and RELA could activate CART gene transcription (P<0.001). In this study, bovine CART promoter region was successfully amplified, and identify the -292 bp-+22 bp was core region of bovine CART gene promoter. And it was proved that the RFX5, RFX1, TEAD4 were inhibiting transcription factors of CART gene; the CREB and RELA were activating transcription factors of CART gene. These findings will enrich the regulatory mechanism of CART gene expression in bovine hypothalamus, and strengthen the understanding of the mechanism of CART regulating follicular development.

Key words: bovine, CART, core promoter, transcriptional regulation, DNA pull down

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