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Mucopolysaccharidosis Type I in 21 Czech and Slovak Patients: Mutation Analysis Suggests a Functional Importance of C-Terminus of the IDUA Protein

Vazna, A; Beesley, C; Berna, L; Stolnaja, L; Myskova, H; Bouckova, M; ... Dvorakova, L; + view all (2009) Mucopolysaccharidosis Type I in 21 Czech and Slovak Patients: Mutation Analysis Suggests a Functional Importance of C-Terminus of the IDUA Protein. AM J MED GENET A , 149A (5) 965 - 974. 10.1002/ajmg.a.32812.

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Abstract

Mucopolysaccharidosis type I (MPS I) is an autosomal recessive lysosomal storage disorder that is caused by a deficiency of the enzyme alpha-L-iduronidase (IDUA). Of the 21 Czech and Slovak patients who have been diagnosed with NIPS I in the last 30 years, 16 have a severe clinical presentation (Hurler syndrome), 2 less severe manifestations (Scheie syndrome), and 3 an intermediate severity (Hurler/Scheie phenotype). Mutation analysis was performed in 20 MPS I patients and 39 mutant alleles were identified. There was a high prevalence of the null mutations p.W402X (12 alleles) and p.Q70X (7 alleles) in this cohort. Four of the 13 different mutations were novel:p.V1620F (3 alleles), p.W626X (1 allele), c.1727 + 2T > G (1 allele) and c.1918_1927del (2 alleles). The pathogenicity of the novel mutations was verified by transient expression studies in Chinese hamster ovary cells. Seven haplotypes were observed in the patient alleles using 13 intragenic polymorphisms. One of the two haplotypes associated with the mutation p.Q70X was not found in any of the controls. Haplotype analysis showed, that mutations p.Q70X, p.V620F, and p.D315Y probably have more than one ancestor. Missense mutations localized predominantly in the hydrophobic core of the enzyme are associated with the severe phenotype, whereas missense mutations localized to the surface of the enzyme are usually associated with the attenuated phenotypes. Mutations in the 130 C-terminal amino acids lead to clinical manifestations, which indicates a functional importance of the C-terminus of the IDUA protein. (c) 2009 Wiley-Liss, Inc.

Type:Article
Title:Mucopolysaccharidosis Type I in 21 Czech and Slovak Patients: Mutation Analysis Suggests a Functional Importance of C-Terminus of the IDUA Protein
DOI:10.1002/ajmg.a.32812
Keywords:mucopolysaccharidosis 1, alpha-L-iduronidase, mutation, polymorphism, haplotype, ALPHA-L-IDURONIDASE, ENZYME-REPLACEMENT THERAPY, BONE-MARROW-TRANSPLANTATION, MOLECULAR-GENETICS, HURLER-SYNDROME, TUNISIAN FAMILIES, COMMON MUTATION, IDENTIFICATION, DISEASE, PHENOTYPE
UCL classification:UCL > School of Life and Medical Sciences > Faculty of Population Health Sciences > Institute of Child Health

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