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Newborn screening for mucopolysaccharidosis type II: Lessons learned.
Molecular Genetics and Metabolism 2023 March 7
We describe our experience with population-based newborn screening for mucopolysaccharidosis type II (MPS II) in 586,323 infants by measurement of iduronate-2-sulfatase activity in dried blood spots between December 12, 2017 and April 30, 2022. A total of 76 infants were referred for diagnostic testing, 0.01% of the screened population. Of these, eight cases of MPS II were diagnosed for an incidence of 1 in 73,290. At least four of the eight cases detected had an attenuated phenotype. In addition, cascade testing revealed a diagnosis in four extended family members. Fifty-three cases of pseudodeficiency were also identified, for an incidence of 1 in 11,062. Our data suggest that MPS II may be more common than previously recognized with a higher prevalence of attenuated cases.
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