While expressed genes in AF tissue are enriched to PPAR signaling pathway, oxidative phosphorylation, amino acid biosynthesis, and other signaling pathways, acting through genes such as FABP1, ELOVL6, SCD, and ADIPOQ. A PPAR signaling pathway is involved in lipid droplets formation and mitochondrial metabolism, and fatty acid oxidation and lipid synthesis are necessary for cellular signaling [50]. This evidence concerns the gene ADIPOQ and atrial fibrillation.