ACSL4 and chronic obstructive pulmonary disease: Our RNA-seq results revealed that cold exposure significantly upregulated fatty acid biosynthesis related genes (ACSL1, FADS2, ELOVL1, SCD5) and downregulated the expression of mitochondrial beta-oxidation related genes (ACADL, ACADM, ACAT1, ACSL4) in skeletal muscle, which might directly explain the increased trend of IMF content and alterations of fatty acids in LDM of COLD pigs.