title: ALG6-CDG in South Africa: Genotype-Phenotype Description of Five Novel Patients.
abstract: ALG6-CDG (formerly named CDG-Ic) (phenotype OMIM 603147, genotype OMIM 604566), is caused by defective endoplasmic reticulum α-1,3-glucosyltransferase (E.C 2.4.1.267) in the N-glycan assembly pathway (Grünewald et al. 2000). It is the second most frequent N-glycosylation disorder after PMM2-CDG; some 37 patients have been reported with 21 different ALG6 gene mutations (Haeuptle & Hennet 2009; Al-Owain 2010). We report on the clinical and biochemical findings of five novel Caucasian South African patients. The first patient had a severe neuro-gastrointestinal presentation. He was compound heterozygous for the known c.998C>T (p.A333V) mutation and the novel c.1338dupA (p.V447SfsX44) mutation. Four more patients, presenting with classical neurological involvement were identified and were compound heterozygous for the known c.257 + 5G>A splice mutation and the c.680G>A (p.G227E) missense mutation. The patients belong to a semi-isolated Caucasian community that may have originated from European pioneers who colonized South Africa in the seventeenth/eighteenth centuries.
authors: Centre for Human Metabonomics, North-West University, Potchefstroom, South Africa, marli.dercksen@nwu.ac.za.
authors: M
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authors: Dercksen
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authors: Crutchley
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authors: EM
authors: Honey
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authors: MM
authors: Lippert
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authors: Matthijs
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authors: Mienie
authors: H C
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authors: Schuman
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authors: Vorster
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authors: Jaeken