Disease Directory Mucopolysaccharidosis Type I Scheie
Metabolic

Mucopolysaccharidosis Type I Scheie

Also known as: MPS I Scheie, attenuated Hurler-Scheie syndrome, IDUA deficiency attenuated form, alpha-L-iduronidase deficiency

Prevalence

1-9 per 100,000 (Orphanet, combined MPS I)

Onset

Childhood, Adolescent

Type

Autosomal recessive genetic

Gene

IDUA

About Mucopolysaccharidosis Type I Scheie

MPS I Scheie is the attenuated form of mucopolysaccharidosis type I, caused by partial deficiency of alpha-L-iduronidase (IDUA), resulting in accumulation of dermatan and heparan sulfate. Unlike severe Hurler syndrome, intellect is typically preserved, but patients develop severe somatic disease including corneal clouding, joint contractures, cardiac valve disease, and airway obstruction. Laronidase (Aldurazyme), an approved enzyme replacement therapy, addresses somatic manifestations.

Common Clinical Features

Corneal clouding Joint stiffness and contractures Cardiac valve disease Carpal tunnel syndrome Obstructive sleep apnea Hepatosplenomegaly Short stature

Clinical Trial Eligibility Tips

What to know before applying to Mucopolysaccharidosis Type I Scheie trials.

IDUA enzyme activity and urinary GAG levels (dermatan and heparan sulfate) are required baseline biomarkers

Laronidase (Aldurazyme) ERT is standard — trials may study intrathecal approaches, gene therapy, or substrate reduction

Cardiac valve assessment (echocardiogram) and pulmonary function are required baseline measures

MPS I Scheie versus Hurler-Scheie distinction may affect trial stratification — phenotypic severity scoring should be documented

Patient Resources

Patient Organization

National MPS Society

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Natural History Registry

MPS Society Patient Registry

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Orphanet

European reference resource for rare diseases (ORPHA:93476)

View on Orphanet ↗

NORD

National Organization for Rare Disorders

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Find recruiting Mucopolysaccharidosis Type I Scheie trials

Search 500,000+ studies from ClinicalTrials.gov, filtered for Mucopolysaccharidosis Type I Scheie. Updated daily.

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