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Living with Carnosinemia

A rare metabolic condition that can cause no symptoms in some people and seizures and developmental problems in others.

Understanding Carnosinemia

Carnosinemia is a rare inborn error of metabolism in which the body has low activity of an enzyme called carnosinase.

People with this condition have carnosine in the blood and urine. Effects vary a lot. Some people have no symptoms. Others have severe developmental delay, intellectual disability, low muscle tone (hypotonia), seizures, and other nerve symptoms. It often starts in infancy.

Signs & symptoms

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

  • Seizures with sudden muscle jerks (myoclonic seizures)
  • Intellectual disability
  • Loss of skills already learned (developmental regression)
  • Low muscle tone (hypotonia)

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. Ask which tests can help

    Your care team will decide which exams and tests can confirm the diagnosis.

Care & treatment

Care team
Genetic specialists (geneticists)
Expert care
Ask about multidisciplinary care centers for rare conditions
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 rare disease patient organizations for support
  • 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
Is my child likely to have symptoms, or none?
How should seizures and development be monitored?
Can genetic testing help our family?

Quick facts

Symptoms usually startInfant
InheritanceAutosomal Recessive

GARD says changes in genes cause this condition. It is inherited in an autosomal recessive way, so a child inherits a changed copy of a gene from each parent.

GeneticInherited Metabolic

Also known as: carnosinase deficiency

Patient organizations

Rare-disease groups that can help

Source: NIH GARD · CarnosinemiaGARD ID 6001 · 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 Carnosinemia.

Explore the Carnosinemia blog

Explore research for Carnosinemia

Explore actively recruiting Carnosinemia studies with HealthSpark.

HealthSpark

Find actively recruiting studies for Carnosinemia with HealthSpark. Share your city to explore research near you.

  • Recruiting studies from ClinicalTrials.gov
  • Share your city to look for research near you
  • Eligibility is confirmed by the study team

Powered by HealthSpark, our AI chat helper

I can help you find recruiting Carnosinemia studies. Enter a ZIP code, address or city below and I'll look within 50 miles.

Powered by HealthSpark, our AI chat helper · Study information from ClinicalTrials.gov · Eligibility is confirmed by the study team.

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