# Transcriptional regulation of porcine PABPN1 gene in adipogenesis

## TL;DR

This study explores how the PABPN1 gene influences fat cell development in pigs and identifies genetic variations that affect its activity.

## Contribution

The study identifies C/EBP α and β as regulators of PABPN1 and discovers a SNP haplotype that enhances PABPN1 promoter activity.

## Key findings

- C/EBP α and β transcription factors regulate PABPN1 by binding to its promoter.
- PABPN1 promotes preadipocyte differentiation in pigs.
- The GCC haplotype increases PABPN1 promoter activity and may aid in selecting fat traits in pigs.

## Abstract

This study aims to reveal the transcriptional regulatory mechanism and effects of poly(A)-binding protein nuclear 1 (PABPN1) on adipogenesis, along with associated polymorphisms.

Transcription factors were identified using dual-luciferase reporter assay, overexpression techniques site-directed mutagenesis, real-time quantitative polymerase chain reaction (qPCR), electrophoretic mobility shift assays and chromatin immunoprecipitation-qPCR. Preadipocyte differentiation was measured with gain- and loss-of-function, Oil Red O staining and extraction assays. Single nucleotide polymorphisms (SNPs) were identified with direct sequencing of PCR products in the promoter, and the effects of these SNPs on PABPN1 expression were identified with dual-luciferase reporter assay.

CCAAT/enhancer-binding protein (C/EBP) α and β regulate PABPN1 expression by directly binding to its promoter. PABPN1 promotes the preadipocyte differentiation in pigs. Three SNPs were identified, with the Haplotype GCC mutation significantly increasing the promoter activity of PABPN1.

PABPN1 promotes the preadipocyte differentiation as a downstream gene of C/EBP α and β. Haplotype GCC may serve as a molecular marker for selection of fat traits in pigs.