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Identification of mutations in the alpha-L-iduronidase gene (IDUA) that cause Hurler and Scheie syndromes.

Abstract：

:Mucopolysaccharidosis type I (MPS-I) is an autosomal recessive genetic disease caused by a deficiency of the lysosomal glycosidase alpha-L-iduronidase. Hurler (severe), Scheie (mild), and Hurler/Scheie (intermediate) syndromes are clinical subtypes of MPS-I, but it is difficult to distinguish between these subtypes by biochemical measurements. Mutation analysis was undertaken to provide a molecular explanation for the clinical variation seen in MPS-I. Using chemical cleavage and direct PCR sequencing, we have defined four previously undescribed mutations for MPS-I (delG1702, 1060 + 2t-->c, R89Q, and 678-7g-->a). R89Q and 678-7g-->a were found to be present in 40% of Scheie syndrome alleles. Expression of R89Q demonstrated reduced stability and activity of the mutant protein. The deleterious effect of R89Q may be potentiated by a polymorphism (A361T) to produce an intermediate phenotype. 678-7g-->a was found to be a mild mutation, since it was present in an index Scheie syndrome patient in combination with a severe allele (W402X). This mutation appears to allow a very small amount of normal mRNA to be produced from the allele which is likely to be responsible for the mild clinical phenotype observed. Both the 5' and 3' splice site mutations (1060 + 2t-->c and 678-7g-->a, respectively) result in high proportions of mature mRNAs containing introns, which has not been observed for other splicing mutations. The frameshift mutation (delG1702) and the 5' splice site mutation (1060 + 2t-->c) are both thought to be associated with severe MPS-I. The identification of these MPS-I mutations begins to document the expected genetic heterogeneity in MPS-I and provides the first molecular explanations for the broad range of clinical phenotypes observed.

journal_name

Am J Hum Genet

journal_title

American journal of human genetics

authors

Scott HS,Litjens T,Nelson PV,Thompson PR,Brooks DA,Hopwood JJ,Morris CP

subject

Has Abstract

pub_date

1993-11-01 00:00:00

pages

973-86

issue

5

eissn

0002-9297

issn

1537-6605

journal_volume

53

pub_type

杂志文章

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