Molecular and clinical characterization of a Moroccan Cog7 deficient patient.

Mutations in the N-linked glycosylation pathway cause rare autosomal recessive defects known as Congenital Disorders of Glycosylation (CDG). A previously reported mutation in the Conserved Oligomeric Golgi complex gene, COG7, defined a new subtype of CDG in a Tunisian family. The mutation disrupted the hetero-octomeric COG complex and altered both N- and O-linked glycosylation. Here we present clinical and biochemical data from a second family with the same mutation.