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Living with Epilepsy, X-linked 1, with variable learning disabilities and behavior disorders

A rare inherited condition with seizures, learning difficulties, and behavior changes, starting in childhood.

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Understanding Epilepsy, X-linked 1, with variable learning disabilities and behavior disorders

Epilepsy, X-linked 1, with variable learning disabilities and behavior disorders is a rare condition with seizures, learning problems, and behavior challenges.

GARD also lists a larger-than-usual head size (macrocephaly). It starts in childhood. It is passed on through the X chromosome.

Signs & symptoms

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

  • Seizures
  • Specific learning disability
  • Aggressive behavior
  • Larger-than-usual head (macrocephaly)

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, genetic specialists and seizure and epilepsy specialists.

  3. Consider genetic testing

    Changes in SYN1 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

    Epilepsy Foundation may keep lists of experts for this condition.

Care & treatment

Care team
Brain and nervous system specialists (neurologists); Genetic specialists (geneticists); 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 Epilepsy 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
Can genetic testing for the SYN1 gene confirm this diagnosis?
How can we support learning and behavior?
How could this pass to other family members?

Quick facts

Symptoms usually startChild
InheritanceX-Linked
GenesSYN1

Changes in the SYN1 gene are likely to cause this condition. It is X-linked recessive, passed on through the X chromosome.

GeneticNeurological

Also known as: epilepsy, x-linked, with variable learning disabilities and behavior disorders, x-linked recessive, x-linked dominant; epilepsy, x-linked, with variable learning disabilities and behaviour disorders, x-linked recessive, x-linked dominant; x-linked epilepsy-learning disabilities-behavior disorders syndrome

Patient organizations

Broader rare-disease groups

Source: NIH GARD · Epilepsy, X-linked 1, with variable learning disabilities and behavior disordersGARD ID 16748 · GARD page updated September 2026 · Plain-language summary by Know Rare; editorial review pending. General information, not medical advice.

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