Increased amounts of the mitochondrial apolipoprotein O /MIC26 were found in diabetic patients along with lipid accumulation in murine liver upon MIC26 expression. MIC26 is a MICOS complex constituent present in the mitochondrial inner membrane. Here, we employed a proteomics analysis approach in WT and MIC26 knockout HepG2 cellular models in normoglycemic and hyperglycemic conditions.