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Living with Familial infantile myoclonic epilepsy

A rare genetic epilepsy that starts in newborns or infants and runs in families, with seizures and sometimes speech and balance problems.

Understanding Familial infantile myoclonic epilepsy

Familial infantile myoclonic epilepsy is a rare genetic epilepsy syndrome with seizures that start in the newborn or infant years.

Seizures involve sudden jerks (myoclonic) and focal seizures, and occur in several members of a family. Some people also have mild slurred speech, balance problems (ataxia), or intellectual disability from borderline to moderate.

Signs & symptoms

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

  • Seizures
  • Sudden muscle jerks (myoclonic seizures)
  • Seizures in one half of the brain (focal)
  • Whole-body seizures (tonic-clonic)
  • Seizures with fever (febrile)
  • Slurred speech (dysarthria)

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 TBC1D24 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
Should we have genetic testing for the TBC1D24 gene?
Which seizure types does my child have, and how are they managed?
How might this affect speech, balance, and learning?

Quick facts

Symptoms usually startNewborn and as an Infant
InheritanceAutosomal Recessive
GenesTBC1D24

Changes in the TBC1D24 gene cause it. It is autosomal recessive, which means a child inherits a changed copy of the gene from each parent.

GeneticNeurological

Also known as: epilepsy, myoclonic, infantile; familial infantile myoclonus epilepsy; fime; fime - familial infantile myoclonic epilepsy; myoclonic epilepsy, infantile, familial

Patient organizations

Broader rare-disease groups

Source: NIH GARD · Familial infantile myoclonic epilepsyGARD ID 17521 · 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 Familial infantile myoclonic epilepsy.

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