Abstract

BACKGROUND
Mucopolysaccharidosis type II (MPS II; also known as Hunter syndrome) is an X-linked multisystem disorder resulting from the defective activity of the enzyme iduronate-2-sulfatase (IDS). Genetic testing is crucial in clarifying and diagnosing different types of MPS diseases. In this paper we report a novel IDS nonsense mutation resulting in MPS II in several patients from a Chinese family.
METHODS
IDS enzyme activity, polymerase chain reaction, and DNA sequencing were performed to confirm the diagnosis of MPS II.
RESULTS
Three patients had no detectable IDS activity. Two genetic tests revealed a novel IDS nonsense mutation (c.1030G>T, p.E344X) inherited from their mothers. The nonsense mutation shortened the peptide chain from 550 to 344 amino acids, which is believed to be a disease-causing mutation.
CONCLUSIONS
MPS II is inherited in an X-linked manner. The risk to sibs depends on the carrier status of the mother. Genetic testing is necessary to identify disease-causing mutation. With this information, carrier testing for at-risk female relatives and prenatal testing for pregnancies at increased risk become possible.

Links

Publisher Full Text

Authors

Li XY, Shi XY, Ju J, Hu XH, Yang XF, Zou LP

Institution

Department of Pediatrics, Chinese PLA General Hospital, 28 Fuxing Road, Beijing, 100853, China.

Source

World journal of pediatrics : WJP 8:3 2012 Aug pg 281-3

MeSH

Asian Continental Ancestry Group
Child, Preschool
China
Codon, Nonsense
Genetic Testing
Humans
Iduronate Sulfatase
Infant
Male
Mucopolysaccharidosis II
Pedigree
Polymerase Chain Reaction

Pub Type(s)

Case Reports
Journal Article

Language

eng

PubMed ID

22622771