Acetyl-coenzyme A acyltransferase 2 promote the differentiation of sheep precursor adipocytes into adipocytes.

The acetyl CoA acyltransferase 2 (ACAA2) is a key enzyme of the fatty acid oxidation pathway, catalyzing the last step of the mitochondrial beta oxidation, thus playing an important role in the fatty acid metabolism. The purpose of this study was to investigate the effect of knocking out ACAA2 on the expression of genes lipoprteinlipase (LPL), peroxisome proliferator-activated receptor-γ (PPAR-γ), fatty acid synthase, fat mass and obesity-associated gene, adipocyte fatty acid-binding protein (AP2) in precursor adipocytes and their differentiation into adipocytes. The knockout vector was constructed using CRISPR-Cas RNA-guided nuclease technology with an efficiency of 23.80%, and the vector was transfected into precursor adipocyte cells, while an overexpression vector of the ACAA2 gene was also transfected in another group of preadipocytes. Quantitative polymerase chain reaction showed that the expression of the PPAR-γ, LPL, and AP2 was significantly lower in the knockout compared with the overexpression group, while there was no difference in cell growth. After induction of adipocyte precursor cells into adipocytes using dexamethasone, insulin, and IBMX, oil red staining showed a significantly different number of lipid droplets in the knockout group. These results provide a preliminary indication for a possible involvement of the ACAA2 gene in adipocyte differentiation in vitro.