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Living with Hereditary spastic paraplegia 42

A pure type of hereditary spastic paraplegia with slowly worsening leg stiffness, from childhood to adulthood.

Understanding Hereditary spastic paraplegia 42

Hereditary spastic paraplegia 42 is a pure form of hereditary spastic paraplegia with slowly worsening stiffness in the legs.

People have a spastic walk, brisk reflexes in the legs, and weakness and wasting of the leg muscles. High arches are seen rarely. GARD says MRI shows no abnormalities. It can start from childhood to adulthood.

Signs & symptoms

Symptoms vary from person to person. GARD lists these among the most common:

  • Stiff legs (spasticity)
  • Spastic walk
  • Brisk reflexes in the legs
  • Leg weakness
  • Wasting of leg muscles
  • Reduced vibration sense in the legs

Not everyone has every symptom. GARD's list comes from the Human Phenotype Ontology.

Diagnosis

  1. Talk with your doctor

    Share the symptoms you've noticed, when they started and your family health history. Notes and photos can help.

  2. See a specialist

    Specialists who may be involved include brain and nervous system specialists and genetic specialists.

  3. Consider genetic testing

    Changes in SLC33A1 are linked to this condition. Genetic testing and counseling can help confirm a diagnosis and explain what it means for your family.

  4. Connect with expert centers

    Spastic Paraplegia Foundation may keep lists of experts for this condition.

Care & treatment

Care team
Brain and nervous system specialists (neurologists); Genetic specialists (geneticists)
Expert care
Expert lists: Spastic Paraplegia Foundation
Treatment
GARD doesn't list specific treatments for this condition. Your care team will tailor care to your symptoms.
Research
Clinical trials and observational studies may be options. See the research section below.

General information, not medical advice. Your care team makes the decisions.

Everyday life

Living with a rare condition is easier with support.

  • Connect with Spastic Paraplegia Foundation
  • Keep notes on symptoms, changes and questions for appointments
  • Ask about patient registries that help research
  • Look into financial aid and travel resources for care visits
Bring these questions to your next doctor visit
Could genetic testing for the SLC33A1 gene confirm the diagnosis?
Which therapies help with stiffness and walking?
Should my relatives be tested?

Quick facts

Symptoms usually startfrom Childhood to Adulthood
InheritanceAutosomal Dominant
GenesSLC33A1

It is caused by changes in the SLC33A1 gene. It is autosomal dominant, so one changed copy of the gene is enough.

GeneticNeurological

Also known as: autosomal dominant pure spastic paraplegia caused by mutation in slc33a1; autosomal dominant spastic paraplegia 42; autosomal dominant spastic paraplegia type 42; hereditary spastic paraplegia type 42; slc33a1 autosomal dominant pure spastic paraplegia; spastic paraplegia 42

Patient organizations

Broader rare-disease groups

Source: NIH GARD · Hereditary spastic paraplegia 42GARD ID 17073 · GARD page updated September 2026 · Plain-language summary by Know Rare; editorial review pending. General information, not medical advice.

You are more than your diagnosis

Perspectives from people navigating life with Hereditary spastic paraplegia 42.

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