ArticleBMC medical genetics2012
1031-1034delTAAC (Leu125Stop): a novel familial UBE3A mutation causing Angelman syndrome in two siblings showing distinct phenotypes.
Article in BMC medical genetics, 2012. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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6 authors at 3 institutions in 1 country.
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Abstract
backgroundMore than 50 mutations in the UBE3A gene (E6-AP ubiquitin protein ligase gene) have been found in Angelman syndrome patients with no deletion, no uniparental disomy, and no imprinting defect. CASE PRESENTATION: We here describe a novel UBE3A frameshift mutation in two siblings who have inherited it from their asymptomatic mother. Despite carrying the same UBE3A mutation, the proband shows a more severe phenotype whereas his sister shows a milder phenotype presenting the typical AS features.
conclusionsWe hypothesized that the mutation Leu125Stop causes both severe and milder phenotypes. Potential mechanisms include: i) maybe the proband has an additional problem (genetic or environmental) besides the UBE3A mutation; ii) since the two siblings have different fathers, the UBE3A mutation is interacting with a different genetic variant in the proband that, by itself, does not cause problems but in combination with the UBE3A mutation causes the severe phenotype; iii) this UBE3A mutation alone can cause either typical AS or the severe clinical picture seen in the proband.
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