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Living with Developmental and epileptic encephalopathy, 17

A rare neurologic condition linked to the GNAO1 gene, with early seizures, developmental delay, and unusual movements.

Understanding Developmental and epileptic encephalopathy, 17

Developmental and epileptic encephalopathy 17, also called GNAO1 encephalopathy, is a rare neurologic condition that causes developmental delay, early seizures, and abnormal movements.

Symptoms can include severe intellectual disability, low muscle tone, irregular muscle contractions (chorea), and involuntary face and tongue movements (dyskinesia). Severity varies. Symptoms may be triggered by strong emotions, illness, and purposeful movements.

Signs & symptoms

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

  • Seizures starting early in life
  • Global developmental delay
  • Absent speech
  • Inability to walk
  • Irregular muscle contractions (chorea)
  • Muscle tensing (dystonia)

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 seizure and epilepsy specialists.

  3. Ask which tests can help

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

  4. Connect with expert centers

    Epilepsy Foundation may keep lists of experts for this condition.

Care & treatment

Care team
Seizure and epilepsy specialists (epileptologist)
Expert care
Expert lists: Epilepsy 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 The Bow Foundation 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 of the GNAO1 gene confirm the diagnosis?
What can trigger movement episodes, and how can we manage them?
Which therapies can help with movement and development?

Quick facts

InheritanceAutosomal Dominant

Changes in the GNAO1 gene cause this condition. It is autosomal dominant, so a changed copy of the gene from one parent can be enough.

Also known as: dee17; developmental and epileptic encephalopathy 17; early infantile epileptic encephalopathy 17; early infantile epileptic encephalopathy caused by mutation in gnao1; early infantile epileptic encephalopathy-17; eiee17

Patient organizations

Source: NIH GARD · Developmental and epileptic encephalopathy, 17GARD ID 13378 · 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

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