Previous studies have pointed out that SLC35A2 is the only known UDP-galactose transporter (UGT) in mammals [15], its mosaic mutation code is mainly located in UGT1 of Golgi apparatus, which can lead to some diseases related to congenital glycosylation disorder [29], such as congenital glycosylation disease (CDG) and isolated focal cortical dysplasia (IFCD) [30]. The gene discussed is SLC35A2; the disease is isolated focal cortical dysplasia.