Hypomorphic IDUA genotypes are associated with retinitis pigmentosa in individuals without syndromic mucopolysaccharidosis type I.
Variant-level functional assays expand the phenotypic spectrum of IDUA-associated disease to include late-onset retinal-predominant or apparently isolated retinitis pigmentosa and indicate that residual enzyme activity likely contributes to systemic sparing, highlighting the value of integrated genomic, biochemical, an...