PMM2 and cerebellar ataxia: Ataxia, apart from being a feature of more commonly diagnosed CDGs (e.g., ALG6, COG8, DPM1, PMM2), may be also a feature of COG4, COG5, GMPPB, MPDU1, NANS, PGM3, SLC35A1, TRAPPC11 /Muscular dystrophy, limb-girdle, type 2S/.