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Title: CDG-Id caused by homozygosity for an ALG3 mutation due to segmental maternal isodisomy UPD3(q21.3-qter)
Authors: Schollen, E ×
Grünewald, S
Keldermans, L
Albrecht, Bruno
Körner, C
Matthijs, Gert #
Issue Date: Apr-2005
Series Title: European Journal of Medical Genetics vol:48 issue:2 pages:153-158
Abstract: We report on a patient with a congenital disorder of glycosylation type Id (CDG-Id) caused by a homozygous mutation in the ALG3 gene, which results from a de novo mutation in combination with a segmental maternal uniparental isodisomy (UPD). The patient presented with severe psychomotor delay, primary microcephaly, and opticus atrophy, compatible with a severe form of CDG. Isoelectric focusing of transferrin showed a type I pattern and lipid-linked oligosaccharide analysis showed an accumulation of dol-PP-GlcNAc2Man5 in patient's fibroblasts suggesting a defect in the ALG3 gene. A homozygous ALG3 missense mutation p.R266C (c.796C > T) was identified. Further evaluation revealed that neither the mother nor the father were carrier of the p.R266C mutation. Marker analysis revealed a segmental maternal isodisomy for the chromosomal region 3q21.3-3qter. UPD for this region has not been described before. More important, the combination of UPD with a de novo mutation is an exceptional coincidence and an extraordinary observation.
ISSN: 1769-7212
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Clinical Genetics Section (-)
Department of Human Genetics - miscellaneous
× corresponding author
# (joint) last author

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