Journal of Tropical Pediatrics Advance Access published online on July 5, 2007
Journal of Tropical Pediatrics, doi:10.1093/tropej/fmm056
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Molecular Analysis in Two Siblings African Patients with Severe Form of Hunter Syndrome: Identification of a Novel (p.Y54X) Nonsense Mutation
aCenter for Human Genetics, CHU Sart-Tilman, University of Liège, Belgium
bDepartment of Paediatrics, National University of Rwanda, Kigali, Rwanda
cCenter for Medical Genetics, Dutch-speaking Free University of Brussels, Belgium
Correspondence: Prof. Vincent Bours, Center for Human Genetics, CHU Sart-Tilman, University of Liège, 4000 Liège, Belgium. E-mail < vbours{at}ulg.ac.be>.
| Abstract |
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Hunter syndrome (or Mucopolysaccharidosis type II, MPS II) is an X-linked recessive disorder due to the deficiency of the iduronate-2-sulfatase (IDS) enzyme, resulting in the accumulation of heparan and dermatan sulfates in the lysosomes. The heterogeneity of clinical phenotypes, ranging from mild-to-severe forms, is a result of different mutations in the IDS gene. We report here, a novel nonsense mutation (p.Y54X) in two siblings MPS II African patients affected with a severe form of the disease. We postulated that the p.Y54X mutation which causes a loss of the IDS region highly conserved among sulfatase enzymes, could be predicted as a severe disease-causing mutation for Hunter syndrome.
Key Words: African patients Hunter syndrome iduronate-2-sulfatase nonsense mutation.