A novel lncRNA BADLNCR1 inhibits bovine adipogenesis by repressing GLRX5 expression

Adipogenesis is a complex cellular process, which needs a series of molecular events, including long non-coding RNA (lncRNA). In the present study, a novel lncRNA named BADLNCR1 was identified as a regulator during bovine adipocyte differentiation, which plays an inhibitory role in lipid droplet formation and adipogenic marker gene expression. CHIPR-seq data demonstrated a potential competitive binding motif between BADLNCR1 and sterol regulatory element-binding proteins 1 and 2 (SREBP1/2). Dual-luciferase reporter assay indicated target relationship between KLF2 and BADLNCR1. Moreover, after the induction of KLF2, the expression of adipogenic gene reduced, while the expression of BADLNCR1 increased. Real-time quantitative PCR (qPCR) showed that BADLNCR1 negatively regulated mRNA expression of GLRX5 gene, a stimulator of genes that promoted formation of lipid droplets and expression of adipogenic genes. GLRX5 could partially reverse the effect of BADLNCR1 in bovine adipocyte differentiation. Dual-luciferase reporter assay stated that BADLNCR1 significantly reduced the enhancement of C/EBP alpha on promoter activity of GLRX5 gene. Furthermore, CHIP-PCR and CHIRP-PCR confirmed the suppressing effect of BADLNCR1 on binding of C/EBP alpha to GLRX5 promoter. Collectively, this study revealed the molecular mechanisms underlying the negative regulation of BADLNCR1 in bovine adipogenic differentiation.