COASY and multiple acyl-CoA dehydrogenase deficiency: In addition, electron transfer flavoprotein (ETF) genes (ETFA and ETFB), some riboflavin transporter genes (SLC52A1, SLC52A2, SLC52A3, and SLC25A32), FAD synthase gene (FLAD1), and coenzyme A synthase gene (COASY) were also reported as the causative genes for late-onset MADD [9–11].