ArticleAmerican journal of medical genetics. Part A2025
Long-Term Health Outcomes of Individuals With Pseudodeficiency Alleles in IDUA May Inform Newborn Screening Practices for Mucopolysaccharidosis Type I.
Article in American journal of medical genetics. Part A, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 2 papers.
What it found
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The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
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Who cites it
2 citing papers in PubMed.
- Variant classification for mucopolysaccharidosis type I; ACMG/AMP specification for IDUA from the ClinGen lysosomal diseases variant curation expert panel.Molecular genetics and metabolism · 2026Article
- Beyond Detection: Comparing State-Based Newborn Screening Methods for Effective Mucopolysaccharidosis I Diagnosis.International journal of neonatal screening · 2026Article
Corrections and comments
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Authors and funding
13 authors.
Funding
Abstract
Mucopolysaccharidosis type I (MPS I), a lysosomal disorder caused by variants in IDUA, was added to the Recommended Uniform Screening Panel for newborn screening in 2016. Positive screening results for MPS I are commonly due to variants known as "pseudodeficiency alleles," which decrease in vitro alpha-L-iduronidase enzyme activity but are thought to provide sufficient in vivo activity. Despite the historic assumption that these variants are biologically benign, the possibility that they could give rise to complex, multigenic, or attenuated phenotypes has not been systemically evaluated in adults. We completed a retrospective matched cohort study using a hospital-based biorepository with data from 65,309 participants, we identified 1803 individuals harboring homozygous IDUA pseudodeficiency alleles. Using electronic medical records (EMR), we compared the prevalence of features of MPS I in participants with homozygous pseudodeficiency alleles to a cohort of matched control participants. We found no clinically relevant significant differences between cases and controls nor genotype-phenotype associations across four alleles. These findings provide empiric support that adults with homozygous IDUA pseudodeficiency alleles are unlikely to develop mild symptoms of disease compared with controls. This study provides a proof-of-concept model for other nonclassical disease variants related to other inherited metabolic disorders, which is necessary as newborn screening expands.
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