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Living with Progressive myoclonic epilepsy type 7

A rare genetic brain condition with worsening muscle jerks and occasional seizures, starting in childhood.

Understanding Progressive myoclonic epilepsy type 7

Progressive myoclonic epilepsy type 7 is a rare genetic neurological disorder caused by changes in the KCNC1 gene.

It starts in childhood to the teen years with muscle jerks (myoclonus) that become very severe and make movement hard. Occasional tonic-clonic seizures and sometimes poor coordination can occur. Some people have a learning disability before seizures begin, and mild decline in thinking.

Signs & symptoms

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

  • Sudden muscle jerks (myoclonus)
  • Myoclonic seizures
  • Tonic-clonic (grand mal) seizures
  • Decline in thinking skills

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 KCNC1 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
Would genetic testing for the KCNC1 gene help our family?
What treatments can help with the muscle jerks?
How can movement and thinking changes be monitored?

Quick facts

Symptoms usually startChild
InheritanceAutosomal Dominant
GenesKCNC1

This condition is caused by changes in the KCNC1 gene. It is autosomal dominant, meaning one changed copy of the gene from a parent is enough.

GeneticNeurological

Also known as: epilepsy, progressive myoclonic type 7; epm7; epm7 - epilepsy progressive myoclonic 7; kcnc1 progressive myoclonic epilepsy; meak; myoclonus epilepsy and ataxia due to potassium channel mutation

Patient organizations

Broader rare-disease groups

Source: NIH GARD · Progressive myoclonic epilepsy type 7GARD ID 17715 · 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 Progressive myoclonic epilepsy type 7.

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