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Updated: Dec 23, 2025

Targeted Next-generation Sequencing and Bioinformatics Pipeline to Evaluate Genetic Determinants of Constitutional Disease
Published on: April 4, 2018
A novel compound mutation in alpha-L-iduronidase gene causes mucopolysaccharidosis type I
Yujue Li1, Xueyang Tang, Yang Meng
1Laboratory of Endocrinology and Metabolism, Department of Endocrinology and Metabolism and National Clinical Research Center for Geriatrics, West China Hospital, Sichuan University, Chengdu 610041, People's Republic of China. xijieyu@hotmail.com, xijieyu@scu.edu.cn.
Abstract:
Mucopolysaccharidosis type I (MPSI) is a rare autosomal recessive disorder caused by mutations in alpha-L-iduronidase (IDUA) gene. IDUA contributes to the degradation of the glycosaminoglycans, including heparan sulphate and dermatan sulphate. Deficient activity of IDUA generates accumulation of glycosaminoglycans in lysosomes leading to MPS I. Here, we identified two boys with MPS I caused by a compound heterozygote of a reported c.265C > T (p.R89W) missense mutation in exon 2 and a novel c.1633G > T (p.E545*, 109) nonsense mutation in exon 11 of IDUA gene in a Chinese family. R89 is close to the active site and its replacement will affect the structure and function of IDUA. Besides, termination from E545 deletes one of the prominent domains and alters the spatial structure of IDUA. In conclusion, our study demonstrates a previously unrecognized mutation in IDUA gene and this report adds to the mutational spectrum observed.
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