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PubMed This is a summary of 65 peer-reviewed journal articles Updated
Neurology · Genetic Epilepsy with Febrile Seizures Plus

Genetic Epilepsy with Febrile Seizures Plus (GEFS+): A Patient Guide

At a Glance

GEFS+ is a family-linked spectrum of seizure disorders: fever often triggers childhood seizures, but some people continue having seizures or have them without fever. Genetic testing can help guide care, yet a negative result does not rule out GEFS+.

Genetic Epilepsy with Febrile Seizures Plus (GEFS+) is not a single disease with a predictable path, but rather a broad “spectrum” of seizure disorders that often ripples through families. At its core, the condition involves a suspected genetic predisposition that makes the brain more sensitive to certain triggers, most famously fever, which can cause the brain’s electrical signaling to become temporarily disorganized [1][2]. While many people within the GEFS+ spectrum only experience the common, self-limited febrile seizures of early childhood, others may continue to have seizures as they grow older or experience them even without a fever, requiring ongoing specialist follow-up [3][4].

The “familial” nature of GEFS+ is one of its most defining characteristics, yet it can also be the most confusing for parents. Because of how the underlying genetics work, the same gene change or suspected predisposition can behave differently in every person it touches—a concept known as variable expressivity [5][6]. In one family, a parent may have outgrown a few “fever fits” as a toddler and never thought of them again, while their child may have a more persistent pattern of seizures that requires medical management. This variability means that while your family history provides a context, your child’s journey will be uniquely their own [7][8].

Researchers have traced the cause of this electrical sensitivity to changes in specific genes, most notably those like SCN1A that provide the blueprints for sodium channels in the brain [9][10]. However, genetic testing may or may not identify a specific cause, and a negative test does not rule out the condition. These channels act like gates that control the flow of electricity; when they are altered, the brain can struggle to maintain the balance between “exciting” and “inhibiting” electrical activity [11]. Understanding these genetic roots is crucial because it helps doctors move away from blanket treatment rules and toward a more individualized approach. Some medications that work well for other types of epilepsy can actually make certain SCN1A-related seizures worse, making a precise diagnosis an essential tool for safe care [12][13].

Living with GEFS+ means focusing on both the “now” and the “future.” While many children on this spectrum follow a favorable trajectory and may eventually outgrow their seizures, this is not guaranteed, and management requires a proactive mindset. This includes maintaining a clear Seizure Action Plan for emergencies and staying vigilant about your child’s developmental and learning progress [14][15]. By viewing GEFS+ as a manageable spectrum rather than a rigid diagnosis, you can work with your medical team to provide the specific support your child needs to thrive [16].

In this guide

6 chapters

01

Understanding Genetic Epilepsy with Febrile Seizures Plus (GEFS+)

Learn what Genetic Epilepsy with Febrile Seizures Plus (GEFS+) means, including seizure patterns, family inheritance, and how it differs from Dravet syndrome.

02

The Genetics of GEFS+: Understanding the Spectrum

Learn how GEFS+ genetics shape inheritance and seizure risk, including SCN1A, GABRG2, variable expressivity, incomplete penetrance, and genetic testing.

03

The GEFS+ Spectrum: Identifying Your Child's Path

Learn how GEFS+ seizure patterns and development help distinguish milder forms from Dravet syndrome, including age of onset, seizure duration, and SCN1A results.

04

The Diagnostic Journey: Gathering the Evidence

Learn how Genetic Epilepsy with Febrile Seizures Plus (GEFS+) is diagnosed using family history, seizure details, genetic testing, and EEG or MRI results.

05

Treating GEFS+: Daily Care and Emergency Response

Learn how GEFS+ treatment balances daily anti-seizure medicine with emergency response, rescue medication, seizure first aid, and an action plan for children.

06

Growing Up with GEFS+: Long-Term Outlook and Daily Life

Learn what GEFS+ may mean as your child grows, including seizure remission, learning and behavior concerns, sleep EEGs, school plans, and daily support.

Common questions in this guide

What is GEFS+?
GEFS+ is a family-linked spectrum of seizure disorders. Fever often triggers seizures in early childhood, but some people continue to have seizures as they grow older or have seizures without fever. The pattern and severity can differ from one family member to another.
Can a child have GEFS+ if genetic testing is negative?
Yes. Genetic testing may not find the gene change responsible for a child’s seizures, so a negative result does not rule out GEFS+. Neurologists consider the seizure pattern, family history, and other clinical information when evaluating the condition.
Does a family history of febrile seizures mean my child will have severe GEFS+?
No. GEFS+ shows variable expressivity, meaning the same family tendency can cause mild, childhood-only febrile seizures in one person and more persistent seizures in another. Family history provides context, but it cannot predict a child’s exact course.
How can SCN1A results affect GEFS+ treatment?
SCN1A helps make sodium channels that control electrical signals in the brain. If testing identifies an SCN1A-related seizure disorder, the result may help the neurologist choose medicines more carefully because some medicines used for other epilepsies can worsen certain SCN1A-related seizures.
Will my child outgrow GEFS+ seizures?
Many children in the GEFS+ spectrum have a favorable course and may eventually outgrow their seizures, but this is not guaranteed. Ongoing specialist follow-up and monitoring of learning and development remain important.
What should I do if my child’s seizure lasts longer than five minutes?
Follow the Seizure Action Plan your child’s medical team has provided and use its emergency instructions. If you do not have a plan, ask the team to create one and clarify when to seek emergency help for a seizure lasting longer than five minutes.

Questions For You

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Questions to Ask Your Doctor

Curated prompts to bring to your next appointment.

  1. 1.Where does my child's current seizure pattern sit within the GEFS+ spectrum?
  2. 2.How should we investigate our family history to better understand my child's likely trajectory?
  3. 3.What specific genes were included in our testing, and how do they influence our choice of treatment?
  4. 4.What are the primary triggers we should watch for, and how can we manage them at school or daycare?
  5. 5.When should we transition from 'watchful waiting' to starting a daily preventive medication?

References

References (16)
  1. 1

    Vagus nerve stimulation for genetic epilepsy with febrile seizures plus (GEFS+) accompanying seizures with impaired consciousness.

    Hanaya R, Niantiarno FH, Kashida Y, et al.

    Epilepsy & behavior case reports 2017; (7()):16-19 doi:10.1016/j.ebcr.2016.11.001.

    PMID: 28070485
  2. 2

    A founder event causing a dominant childhood epilepsy survives 800 years through weak selective pressure.

    Grinton BE, Robertson E, Fearnley LG, et al.

    American journal of human genetics 2022; (109(11)):2080-2087 doi:10.1016/j.ajhg.2022.10.004.

    PMID: 36288729
  3. 3

    A Behavioral Screen for Heat-Induced Seizures in Mouse Models of Epilepsy.

    Das A, Smith MA, O'Dowd DK

    Journal of visualized experiments : JoVE 2021; doi:10.3791/62846.

    PMID: 34309607
  4. 4

    GABRG2 mutations in genetic epilepsy with febrile seizures plus: structure, roles, and molecular genetics.

    Li X, Guo S, Sun Y, et al.

    Journal of translational medicine 2024; (22(1)):767 doi:10.1186/s12967-024-05387-1.

    PMID: 39143639
  5. 5

    SCN1A clinical spectrum includes the self-limited focal epilepsies of childhood.

    Kivity S, Oliver KL, Afawi Z, et al.

    Epilepsy research 2017; (131()):9-14 doi:10.1016/j.eplepsyres.2017.01.012.

    PMID: 28192756
  6. 6

    Investigating the effect of polygenic background on epilepsy phenotype in 'monogenic' families.

    Oliver KL, Scheffer IE, Ellis CA, et al.

    EBioMedicine 2024; (109()):105404 doi:10.1016/j.ebiom.2024.105404.

    PMID: 39476534
  7. 7

    Genetic epilepsy with febrile seizures plus: Refining the spectrum.

    Zhang YH, Burgess R, Malone JP, et al.

    Neurology 2017; (89(12)):1210-1219 doi:10.1212/WNL.0000000000004384.

    PMID: 28842445
  8. 8

    Genetic literacy series: genetic epilepsy with febrile seizures plus.

    Myers KA, Scheffer IE, Berkovic SF,

    Epileptic disorders : international epilepsy journal with videotape 2018; (20(4)):232-238 doi:10.1684/epd.2018.0985.

    PMID: 30078767
  9. 9

    Association of SLC32A1 Missense Variants With Genetic Epilepsy With Febrile Seizures Plus.

    Heron SE, Regan BM, Harris RV, et al.

    Neurology 2021; (96(18)):e2251-e2260 doi:10.1212/WNL.0000000000011855.

    PMID: 34038384
  10. 10

    SCN1A/NaV 1.1 channelopathies: Mechanisms in expression systems, animal models, and human iPSC models.

    Mantegazza M, Broccoli V

    Epilepsia 2019; (60 Suppl 3()):S25-S38 doi:10.1111/epi.14700.

    PMID: 31904127
  11. 11

    Dissecting the phenotypes of Dravet syndrome by gene deletion.

    Rubinstein M, Han S, Tai C, et al.

    Brain : a journal of neurology 2015; (138(Pt 8)):2219-33 doi:10.1093/brain/awv142.

    PMID: 26017580
  12. 12

    From Symptomatic Therapies to Disease-Modifying Approaches for Neuronal Sodium Channel Disorders.

    Dinoi G, Canfora I, D'Agnano D, et al.

    International journal of molecular sciences 2025; (27(1)) doi:10.3390/ijms27010032.

    PMID: 41515912
  13. 13

    Acute effect of antiseizure drugs on background oscillations in Scn1a A1783V Dravet syndrome mouse model.

    Quinn S, Brusel M, Ovadia M, Rubinstein M

    Frontiers in pharmacology 2023; (14()):1118216 doi:10.3389/fphar.2023.1118216.

    PMID: 37021051
  14. 14

    Outcomes and comorbidities of SCN1A-related seizure disorders.

    de Lange IM, Gunning B, Sonsma ACM, et al.

    Epilepsy & behavior : E&B 2019; (90()):252-259 doi:10.1016/j.yebeh.2018.09.041.

    PMID: 30527252
  15. 15

    Recommendations for the community-based management of prolonged convulsive seizures in children in Europe.

    Vigevano F, Arzimanoglou A, Auvin S, et al.

    BMC pediatrics 2026; (26(1)):135.

    PMID: 41593567
  16. 16

    Understanding neurodevelopmental trajectories and behavioral profiles in SCN1A-related epilepsy syndromes.

    Postma A, Minderhoud CA, Otte WM, et al.

    Epilepsy & behavior : E&B 2024; (154()):109726 doi:10.1016/j.yebeh.2024.109726.

    PMID: 38513571

This GEFS+ page is for informational purposes only and does not constitute medical advice. Your child’s neurologist and genetics team should interpret genetic results and guide seizure care.