
Image Credit: University of Manchester
Scientific Frontline: Extended "At a Glance" Summary: IDUA Gene Mutations and Retinitis Pigmentosa
The Core Concept: Hypomorphic mutations in the IDUA gene, typically known for causing the severe childhood metabolic disorder mucopolysaccharidosis type I (MPS I), have been discovered to cause retinitis pigmentosa, a form of inherited blindness in adults.
Key Distinction/Mechanism: Unlike classic MPS I, which results from severe genetic faults and affects multiple organ systems, this milder presentation stems from faults that leave behind a tiny fraction (0.5 to 2 percent) of normal enzyme activity. This residual activity protects most organs but fails to support the retina, likely due to the eye's exceptionally high energy demands and reliance on cellular recycling machinery.
Origin/History: The connection was established in an October 2026 international study co-led by the University of Manchester, University College London, and the Greenwood Genetic Center, and published in The American Journal of Human Genetics.

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