Recently, mutations in genes involved in Rf transport and metabolism, that is, Rf transporter 1 gene (SLC52A1),1, 8, 9 FAD synthase gene (FLAD1),10 and mitochondrial FAD transporter gene (SLC25A32)11, 12 have been shown to cause MADD(‐like) clinical and biochemical phenotypes. Here, SLC52A1 is linked to multiple acyl-CoA dehydrogenase deficiency.