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Permanent URL to this publication: http://dx.doi.org/10.5167/uzh-25740

Vleugels, W; Haeuptle, M A; Ng, B G; Michalski, J C; Battini, R; Dionisi-Vici, C; Ludman, M D; Jaeken, J; Foulquier, F; Freeze, H H; Matthijs, G; Hennet, T (2009). RFT1 deficiency in three novel CDG patients. Human Mutation, 30(10):1428-1434.

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Abstract

The medical significance of N-glycosylation is underlined by a group of inherited human disorders called Congenital Disorders of Glycosylation (CDG). One key step in the biosynthesis of the Glc(3)Man(9)GlcNAc(2)-PP-dolichol precursor, essential for N-glycosylation, is the translocation of Man(5)GlcNAc(2)-PP-dolichol across the endoplasmic reticulum membrane. This step is facilitated by the RFT1 protein. Recently, the first RFT1-deficient CDG (RFT1-CDG) patient was identified and presented a severe N-glycosylation disorder. In the present study, we describe three novel CDG patients with an RFT1 deficiency. The first patient was homozygous for the earlier reported RFT1 missense mutation (c.199C>T; p.R67C), whereas the two other patients were homozygous for the missense mutation c.454A>G (p.K152E) and c.892G>A (p.E298 K), respectively. The pathogenic character of the novel mutations was illustrated by the accumulation of Man(5)GlcNAc(2)-PP-dolichol and by reduced recombinant DNase 1 secretion. Both the glycosylation pattern and recombinant DNase 1 secretion could be normalized by expression of normal RFT1 cDNA in the patients' fibroblasts. The clinical phenotype of these patients comprised typical CDG symptoms in addition to sensorineural deafness, rarely reported in CDG patients. The identification of additional RFT1-deficient patients allowed to delineate the main clinical picture of RFT1-CDG and confirmed the crucial role of RFT1 in Man(5)GlcNAc(2)-PP-dolichol translocation.

Item Type:Journal Article, refereed, original work
Communities & Collections:04 Faculty of Medicine > Center for Integrative Human Physiology
04 Faculty of Medicine > Institute of Physiology
07 Faculty of Science > Institute of Physiology
DDC:570 Life sciences; biology
610 Medicine & health
Language:English
Date:2009
Deposited On:16 Dec 2009 15:32
Last Modified:27 Nov 2013 20:46
Publisher:Wiley-Blackwell
ISSN:1059-7794
Additional Information:The definitive version is available at www.blackwell-synergy.com
Publisher DOI:10.1002/humu.21085
PubMed ID:19701946
Citations:Web of Science®. Times Cited: 12
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