Living with Hypermethioninemia with deficiency of S-adenosylhomocysteine hydrolase
A rare inherited condition with high methionine, muscle disease, and delayed nerve covering (myelin) growth from birth.
Understanding Hypermethioninemia with deficiency of S-adenosylhomocysteine hydrolase
Main symptoms are developmental delay, behavior differences, severe muscle disease, and delayed myelin growth from birth. Myelin is the layer covering nerves that helps signals travel. A methionine-restricted diet with creatine supplements may partly improve delayed myelination and development. It can appear at a variety of ages.
Signs & symptoms
Symptoms vary from person to person. GARD lists these among the most common:
- Global developmental delay
- Delayed myelin growth in the brain
- Low muscle tone in infants
- Muscle disease (myopathy)
- Slow weight gain
- Crossed eyes
Not everyone has every symptom. GARD's list comes from the Human Phenotype Ontology.
Diagnosis
- 1Talk with your doctor
Share the symptoms you've noticed, when they started and your family health history. Notes and photos can help.
- 2See a specialist
Specialists who may be involved include brain and nervous system specialists and genetic specialists.
- 3Consider genetic testing
Changes in AHCY are linked to this condition. Genetic testing and counseling can help confirm a diagnosis and explain what it means for your family.
Care & treatment
- Care team
- Brain and nervous system specialists (neurologists); 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
Quick facts
Changes in the AHCY gene cause this condition. It is autosomal recessive, so a child inherits a changed copy of the gene from each parent.
Also known as: deficiency of s-adenosylhomocysteine hydrolase; hypermethioninemia due to s-adenosylhomocysteine hydrolase deficiency; psychomotor retardation due to s-adenosylhomocysteine hydrolase deficiency; s-adenosylhomocysteine hydrolase deficiency
Patient organizations
Rare-disease groups that can help
- Global GenesRare Diseases · United States
- National Organization for Rare DisordersRare Diseases · United States
- Genetic AllianceRare Diseases · United States
- RARE FoundationRare Diseases · United States
You are more than your diagnosis
Perspectives from people navigating life with Hypermethioninemia with deficiency of S-adenosylhomocysteine hydrolase.
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