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Hereditary spastic paraplegia 50

Synonyms
Spastic paraplegia 50, autosomal recessive

Summary

Excerpted from the GeneReview: AP-4-Associated Hereditary Spastic Paraplegia
AP-4-associated hereditary spastic paraplegia (HSP), also known as AP-4 deficiency syndrome, is a group of neurodegenerative disorders characterized by a progressive, complex spastic paraplegia with onset typically in infancy or early childhood. Early-onset hypotonia evolves into progressive lower-extremity spasticity. The majority of children become nonambulatory and usually wheelchair bound. Over time spasticity progresses to involve the upper extremities, resulting in a spastic tetraplegia. Associated complications include dysphagia, contractures, foot deformities, dysregulation of bladder and bowel function, and a pseudobulbar affect. About 50% of affected individuals have seizures. Postnatal microcephaly (usually in the -2SD to -3SD range) is common. All have developmental delay. Speech development is significantly impaired and many affected individuals remain nonverbal. Intellectual disability in older children is usually moderate to severe.
Full text of GeneReview (by section):
Summary
GeneReview Scope
Diagnosis
Clinical Characteristics
Genetically Related (Allelic) Disorders
Differential Diagnosis
Management
Genetic Counseling
Resources
Molecular Genetics
Chapter Notes
References
Authors:
Darius Ebrahimi-Fakhari
Robert Behne
Alexandra K Davies
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Available tests

37 tests are in the database for this condition.

Clinical tests (37 available)

Molecular Genetics Tests

Genes See tests for all associated and related genes

  • Also known as: CPSQ3, MU-4, MU-ARP2, SPG50, AP4M1
    Summary: adaptor related protein complex 4 subunit mu 1

Clinical features

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Imported from Human Phenotype Ontology (HPO)

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