Hurler–Scheie syndrome

Hurler-Scheie syndrome
Other names	Mucopolysaccharidosis type I H-S
Structure of dermatan sulfate, one of the molecules that accumulates in the lysosomes of MPS I patients
Usual onset	Age 3-8 years
Causes	Deficiency of the alpha-L iduronidase enzyme
Differential diagnosis	Other forms of MPS I; Hunter syndrome; other mucopolysaccharidoses
Treatment	Enzyme replacement therapy with iduronidase; surgery
Prognosis	Life expectancy is generally into the late teens or early 20s, but may vary depending on the severity of the disease
Frequency	1:115,000 (Hurler-Scheie syndrome/intermediate)[1]

Hurler–Scheie syndrome is a genetic disorder caused by the buildup of glycosaminoglycans (GAGs) in various organ tissues. It is a cutaneous condition, also characterized by mild mental retardation and corneal clouding.^[2] Respiratory problems, sleep apnea, and heart disease may develop in adolescence.^[1]

Hurler–Scheie syndrome is classified as a lysosomal storage disease. Patients with Hurler–Scheie syndrome lack the ability to break down GAGs in their lysosomes due a deficiency of the enzyme iduronidase.^{[citation needed]}

All forms of mucopolysaccharidosis type I (MPS I) are a spectrum of the same disease. Hurler-Sheie is the subtype of MPS I with intermediate severity. Hurler syndrome is the most severe form, while Scheie syndrome is the least severe form. Some clinicians consider the differences between Hurler, Hurler-Scheie, and Scheie syndromes to be arbitrary. Instead, they classify these patients as having "severe", "intermediate", or "attenuated" MPS I.^[1]

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