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Living with Krabbe disease due to saposin A deficiency

A rare metabolic and nerve disease that starts in infancy and affects the lungs, brain, and nerves.

Understanding Krabbe disease due to saposin A deficiency

Krabbe disease due to saposin A deficiency is a rare metabolic and neurological disease with breathing and nervous system problems.

It is different genetically from the more common form of Krabbe disease. It usually begins in infancy and involves the lungs, brain, and nerves. GARD lists feeding difficulties, seizures, and changes in muscle tone and reflexes.

Signs & symptoms

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

  • Breathing problems
  • Pauses in breathing (central apnea)
  • Feeding difficulties
  • Seizures
  • Muscle stiffness (hypertonia)
  • Worsening nervous system symptoms

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 genetic specialists.

  3. Consider genetic testing

    Changes in PSAP 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

    Krabbe Connect may keep lists of experts for this condition.

Care & treatment

Care team
Genetic specialists (geneticists)
Expert care
Expert lists: Krabbe Connect
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 Krabbe Connect and other patient organizations
  • 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
Can genetic testing for the PSAP gene confirm the diagnosis?
How can we support my child's breathing and feeding?
Which specialists, such as neurology and lung doctors, should be on our team?

Quick facts

InheritanceAutosomal Recessive
GenesPSAP

Changes in the prosaposin (PSAP) gene cause this condition. It is autosomal recessive, meaning a child inherits a changed copy of the gene from each parent.

GeneticLysosomal Storage

Also known as: atypical krabbe disease due to saposin a deficiency; krabbe disease, atypical; krabbe disease, atypical due to saposin a deficiency; krabbe disease, atypical, due to saposin a deficiency; saposin a deficiency

Patient organizations

Source: NIH GARD · Krabbe disease due to saposin A deficiencyGARD ID 10289 · 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 Krabbe disease due to saposin A deficiency.

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