Objective: To analyze the mutations of IDS gene in a mucopolysaccharidosis type II (MPSII) family and to make prenatal diagnosis on the high-risk fetus which has been pregnant for eleven weeks.
Methods: IDS gene was analyzed by bidirectional DNA sequencing in 2 patients and their mother, and 5 unaffected individuals. Prenatal diagnosis for the high-risk fetus was performed by chorionic villus sampling after the genotypes was identified.
Results: The mutation c.344delA (N115fsX15) was detected in the two patients, and the mother of patients carried the heterozygous c.344delA (N115fsX15) mutation. None of the mutant was detected in the 5 unaffected subjects. The fetus carried c.344delA (N115fsX15) heterozygous mutation and was a carrier.
Conclusion: The deletion mutation c.344delA (N115fsX15) is causative to the pedigree of MPSII, and prenatal diagnosis is the efficient method to avoid defect birth.