COG8 deficiency causes new congenital disorder of glycosylation type IIh.

Abstract:

:We describe a new Type II congenital disorder of glycosylation (CDG-II) caused by mutations in the conserved oligomeric Golgi (COG) complex gene, COG8. The patient has severe psychomotor retardation, seizures, failure to thrive and intolerance to wheat and dairy products. Analysis of serum transferrin and total serum N-glycans showed normal addition of one sialic acid, but severe deficiency in subsequent sialylation of mostly normal N-glycans. Patient fibroblasts were deficient in sialylation of both N- and O-glycans, and also showed slower brefeldin A (BFA)-induced disruption of the Golgi matrix, reminiscent of COG7-deficient cells. Patient fibroblasts completely lacked COG8 protein and had reduced levels and/or mislocalization of several other COG proteins. The patient had two COG8 mutations which severely truncated the protein and destabilized the COG complex. The first, IVS3 + 1G > A, altered the conserved splicing site of intron 3, and the second deleted two nucleotides (1687-1688 del TT) in exon 5, truncating the last 47 amino acids. Lentiviral-mediated complementation with normal COG8 corrected mislocalization of other COG proteins, normalized sialylation and restored normal BFA-induced Golgi disruption. We propose to call this new disorder CDG-IIh or CDG-II/COG8.

journal_name

Hum Mol Genet

journal_title

Human molecular genetics

authors

Kranz C,Ng BG,Sun L,Sharma V,Eklund EA,Miura Y,Ungar D,Lupashin V,Winkel RD,Cipollo JF,Costello CE,Loh E,Hong W,Freeze HH

doi

10.1093/hmg/ddm028

subject

Has Abstract

pub_date

2007-04-01 00:00:00

pages

731-41

issue

7

eissn

0964-6906

issn

1460-2083

pii

ddm028

journal_volume

16

pub_type

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