ALG6 and congenital disorder of glycosylation: In patients with congenital disorder of glycosylation (CDG) associated with mutations in the ALG6 gene, which encodes Man9GlcNAc2-PP-dolichol: dolichol-Glc glucosyltransferase, Man9GlcNAc2-PP-dolichol is poorly glucosylated and inefficient protein N-glycosylation ensues [16].