Jeavons Syndrome

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Subtypes

2

Eyelid Myoclonia with Absences (EMA)

The most common presentation, characterized by eyelid myoclonia with or without absences.

Show evidence (2 references)

PMID:30082241 SUPPORT

"Criteria for Jeavons syndrome included all of the following: (1) eyelid myoclonia with or without absences..."

The criteria for diagnosing Jeavons syndrome include eyelid myoclonia with or without absences, supporting the statement's description.

PMID:37329145 SUPPORT

"There was consensus that generalized tonic-clonic and absence seizures are typically or occasionally seen in patients."

The consensus specifies that absence seizures can be typically or occasionally seen in patients with Jeavons syndrome, supporting the statement.

Eyelid Myoclonia with Absences and Photosensitivity (EMA+)

Eyelid myoclonia with absences that are consistently provoked by photic stimulation.

Show evidence (2 references)

PMID:35394968 SUPPORT

"Epilepsy with eyelid myoclonia (EMA) is characterized by eyelid myoclonia, eyelid closure sensitivity, and photosensitivity."

This reference confirms that EMA, a defining feature of Jeavons Syndrome, includes photosensitivity as well as eyelid myoclonia and absences.

PMID:29722743 SUPPORT

"Eyelid myoclonia with absences, generalized tonic-clonic seizures, and severe photosensitivity accompanied by eyelid myoclonia."

This case report discusses a patient with Jeavons Syndrome exhibiting eyelid myoclonia with absences and severe photosensitivity, supporting the subtype EMA+ described in the statement.

⚙

Pathophysiology

3

Complex Genetic Predisposition

A complex genetic basis involving multiple genes contributes to susceptibility.

Show evidence (1 reference)

PMID:30082241 SUPPORT

"Jeavons syndrome is an underreported epileptic syndrome characterized by eyelid myoclonia, eyelid closure-induced seizures or electroencephalography paroxysms, and photosensitivity. Drug-resistant epilepsy is common, but the prognostic factors and clinical course leading to drug resistance have..."

The abstract discusses drug resistance without specifying a particular genetic basis, but it does imply complexity by mentioning the variability in response to treatments and presence of multiple seizure types.

Neuronal Hyperexcitability

Neurons in the brain exhibit increased excitability, particularly in response to visual stimuli.

Excitatory Glutamatergic Neuron link

chemical synaptic transmission link

Show evidence (2 references)

PMID:21729035 PARTIAL

"We observed two neurophysiologic findings in JS: (1) focal interictal EDs from posterior head region; and (2) predominant focal posterior ictal EDs preceding generalized EDs."

While the study supports an increased excitability of neurons in response to visual stimuli (such as photic stimulation), it does not specifically identify excitatory glutamatergic neurons as the key cell type involved.

PMID:31444362 NO_EVIDENCE

"The transition from a preictal state to a generalized seizure leads to an abrupt increase in neural activity and connectivity, which is accompanied by a strong alteration in glia-neuron interactions and a massive increase in extracellular glutamate."

This study discusses neural activity and connectivity alterations and increased extracellular glutamate during seizures but does not specifically associate these findings with Jeavons Syndrome.

Disrupted Cortical Function

Disruptions in normal brain function, especially in the visual cortex and thalamus, leading to seizures.

visual perception link

Visual Cortex link Thalamus link

Show evidence (2 references)

PMID:21729035 PARTIAL

"JS has been proposed as idiopathic generalized epilepsy (IGE) because of normal posterior dominant background activity and paroxysmal generalized ictal epileptiform discharges (EDs). However, we noticed subtle occipital EDs preceding EM and interictal posterior EDs using digital video-EEG......"

The literature indicates involvement of the occipital cortex and mentions generalized epilepsy networks, which may include the thalamus. However, it does not explicitly support the claim that disruptions in the visual cortex and thalamus are the predominant mechanisms in Jeavons Syndrome.

PMID:29880477 NO_EVIDENCE

"Largely accepted in the literature is the role the interconnections between the thalamus and cortex play in generalized epilepsy. However, thalamocortical involvement is less understood in focal epilepsy in terms of the effect of seizures on thalamocortical circuitry in the developing brain and..."

This study discusses the role of thalamocortical connections in generalized and focal epilepsy but does not provide specific information on Jeavons Syndrome or its mechanisms.

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Pathograph

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Phenotypes

7

Eye 1

Impaired Visual Functioning During Episodes FREQUENT Visual loss (HP:0000572)

Show evidence (2 references)

PMID:8270934 SUPPORT

"Brief, typical absences occur with rapid eyelid myoclonia associated with retropulsive movements of the eyeballs and occasionally of the head. The seizures are of shorter duration than in childhood absence epilepsy, and are accompanied by less profound impairment of consciousness."

The rapid eyelid movements and retropulsive eye movements during seizures directly impair visual function during episodes.

PMID:32554361 SUPPORT

"Jeavons syndrome (JS) is mainly characterized by eyelid myoclonia with or without absences."

The characteristic eyelid myoclonia inherently causes transient visual impairment during episodes due to involuntary eyelid closure.

Nervous System 3

Eyelid Myoclonia VERY_FREQUENT Absence seizure with eyelid myoclonia (HP:0011149)

Sequelae: Impaired Visual Functioning During Episodes

Show evidence (4 references)

PMID:32554361 SUPPORT

"Jeavons syndrome (JS) is mainly characterized by eyelid myoclonia with or without absences."

The literature supports the neurologic diagnostic of eyelid myoclonia as a high frequency phenotype of Jeavons Syndrome (JS).

PMID:30685520 SUPPORT

"Eyelid myoclonia, the most common seizure type in all 8 patients, were typically initiated by eating or other simple orofacial stimuli."

This study confirms that eyelid myoclonia is a common and significant phenotype of JS, reinforcing the diagnostic.

PMID:36216271 SUPPORT

"To the best of our knowledge, this is the first case of STAG2 encephalopathy fulfilling all electroclinical criteria for epilepsy with eyelid myoclonia and absences (EMA), formally named Jeavons syndrome (JS)."

It confirms the diagnostic frequency of eyelid myoclonia as a defining characteristic of JS.

+ 1 more reference

Absences VERY_FREQUENT Absence seizure with eyelid myoclonia (HP:0011149)

Show evidence (1 reference)

PMID:15508923 SUPPORT

"Eyelid myoclonia and absence."

The literature provides a title indicating a connection between eyelid myoclonia (a feature of Jeavons Syndrome) and absences, further supporting the statement.

Generalized Tonic-Clonic Seizures OCCASIONAL Bilateral tonic-clonic seizure with generalized onset (HP:0025190)

Show evidence (1 reference)

PMID:30082241 PARTIAL

"After a median follow-up of two years, 80% of patients had drug-resistant epilepsy and 70% experienced generalized tonic-clonic seizures."

The statement is partially supported because generalized tonic-clonic seizures occur in 70% of patients, which suggests a high frequency rather than 'occasional'.

Other 3

Mild Cognitive Impairment OCCASIONAL

Show evidence (1 reference)

PMID:26492104 PARTIAL

"All participants completed neuropsychological evaluations. Statistical analyses revealed performance that was below average on measures of global IQ, processing speed and rote, verbal learning coupled with average nonverbal reasoning, and sustained attention. There was also evidence of impaired..."

The literature supports that there are cognitive impairments in Jeavons syndrome, but it does not explicitly classify these impairments as 'mild cognitive impairment' (MCI) nor does it mention the frequency as 'occasional'. The impairments are more specific and varied, making the statement partially correct but not completely accurate.

Photosensitivity FREQUENT

Increased sensitivity to light stimulation, which can provoke seizures or eyelid myoclonia. A common finding in Jeavons syndrome.

Show evidence (1 reference)

PMID:30082241 SUPPORT

"Jeavons syndrome is an underreported epileptic syndrome characterized by eyelid myoclonia, eyelid closure-induced seizures or electroencephalography paroxysms, and photosensitivity."

The abstract clearly states that photosensitivity is a characteristic feature of Jeavons syndrome.

Developmental Delays OCCASIONAL

Mildly delayed motor, language, or social milestones in some patients, especially with early onset of seizures.

Show evidence (2 references)

PMID:30082241 NO_EVIDENCE

"BACKGROUND: Jeavons syndrome is an underreported epileptic syndrome characterized by eyelid myoclonia, eyelid closure-induced seizures or electroencephalography paroxysms, and photosensitivity."

The abstract does not mention developmental delays or any developmental milestones in relation to Jeavons Syndrome.

PMID:30683501 NO_EVIDENCE

"Jeavons Syndrome: An Overlooked Epilepsy Syndrome."

The abstract does not provide information on developmental delays or milestones in Jeavons Syndrome.

🧬

Genetic Associations

9

SYNGAP1 (Associated)

Show evidence (2 references)

PMID:30541864 SUPPORT

"Seizure types included eyelid myoclonia with absences (65%), myoclonic seizures (34%), atypical (20%) and typical (18%) absences, and atonic seizures (14%), triggered by eating in 25%."

This large cohort study of 57 SYNGAP1 patients found 65% had eyelid myoclonia with absences, demonstrating strong overlap with Jeavons syndrome phenotype.

PMID:34070602 SUPPORT

"Based on this, four genes could be associated to this syndrome (SYNGAP1, KIA02022/NEXMIF, RORB, and CHD2)."

This review identifies SYNGAP1 as one of four candidate genes associated with eyelid myoclonia with absences (Jeavons syndrome).

NEXMIF (Associated)

Show evidence (1 reference)

PMID:34070602 SUPPORT

"Based on this, four genes could be associated to this syndrome (SYNGAP1, KIA02022/NEXMIF, RORB, and CHD2)."

This review identifies NEXMIF (KIAA2022) as one of four candidate genes associated with eyelid myoclonia with absences (Jeavons syndrome).

RORB (Associated)

Show evidence (1 reference)

PMID:34070602 SUPPORT

"Based on this, four genes could be associated to this syndrome (SYNGAP1, KIA02022/NEXMIF, RORB, and CHD2)."

This review identifies RORB as one of four candidate genes associated with eyelid myoclonia with absences (Jeavons syndrome).

CHD2 (Associated)

Show evidence (2 references)

PMID:26262932 PARTIAL

"Conversely, CHD2 could be responsible for a proper phenotype characterized by infantile-onset generalized epilepsy, intellectual disability, and photosensitivity, which might overlap with MAE, Lennox-Gastaut, Dravet, and Jeavons syndromes."

The literature indicates that CHD2 mutations may overlap with phenotypes seen in Jeavons Syndrome, but it does not specifically state a direct genetic association exclusive to Jeavons Syndrome.

PMID:34070602 SUPPORT

"Based on this, four genes could be associated to this syndrome (SYNGAP1, KIA02022/NEXMIF, RORB, and CHD2)."

This review identifies CHD2 as one of four candidate genes associated with eyelid myoclonia with absences (Jeavons syndrome).

CSNK2B (Associated)

SLC2A1 (Associated)

Show evidence (1 reference)

PMID:28419980 REFUTE

"We did not detect any pathogenic mutations in SLC2A1 in this cohort. Our data suggests that the frequency of GLUT1 mutations in NAFE is low."

The study indicates that no pathogenic mutations in SLC2A1 were found in the cohort, suggesting a low frequency of association with certain types of epilepsy, including Jeavons syndrome.

KCNB1 (Associated)

Show evidence (1 reference)

PMID:34070602 PARTIAL

"Moreover, although there is not enough evidence yet to consider them as candidate for EMA, three more genes present also different alterations in some patients with clinical diagnosis of the disease (SLC2A1, NAA10, and KCNB1)."

This review notes KCNB1 alterations in some EMA patients, though evidence is limited.

NAA10 (Associated)

Show evidence (1 reference)

PMID:34070602 PARTIAL

"Moreover, although there is not enough evidence yet to consider them as candidate for EMA, three more genes present also different alterations in some patients with clinical diagnosis of the disease (SLC2A1, NAA10, and KCNB1)."

This review notes NAA10 alterations in some EMA patients, though evidence is limited.

GABRA1 (Associated)

Show evidence (3 references)

PMID:14631097 REFUTE

"An Ala322Asp mutation in the GABRA1 gene was recently reported to be responsible for causing the autosomal dominant (AD) form of juvenile myoclonic epilepsy (JME) in a French-Canadian family."

The abstract does not mention Jeavons syndrome and focuses on juvenile myoclonic epilepsy related to GABRA1 mutations in a different population.

PMID:30082241 NO_EVIDENCE

"We identified 30 patients who met the diagnostic criteria of Jeavons syndrome at a single institution..."

The study focuses on clinical features and treatment response in Jeavons syndrome without mentioning GABRA1 or a genetic association.

PMID:20074235 NO_EVIDENCE

"We have created the Epilepsy Genetic Association Database (epiGAD)..."

The database mentions epilepsy genetic association studies but does not specifically address Jeavons syndrome or GABRA1.

💊

Treatments

6

Valproic Acid

Action: Pharmacotherapy NCIT:C15986

Agent: valproic acid ↗

First-line treatment, effective in controlling seizures in many patients.

Show evidence (2 references)

PMID:6771426 PARTIAL

"Valproic acid, used alone or in combination with other anticonvulsants in 100 children with epilepsy, improved seizure control in all age groups."

The reference supports the efficacy of Valproic Acid in controlling seizures, but it does not specifically mention Jeavons Syndrome or describe it as a first-line treatment.

PMID:11393330 PARTIAL

"Valproic acid controls absences in 75% of patients and also GTCS (70%) and myoclonic jerks (75%); however, it may be undesirable for some women."

Valproic acid is mentioned as effective in controlling certain types of seizures common in Jeavons Syndrome (myoclonic jerks), but again it does not specifically refer to Jeavons Syndrome or define it as first-line treatment.

Ethosuximide

Action: Pharmacotherapy NCIT:C15986

Agent: ethosuximide ↗

May be used as an alternative or adjunctive therapy.

Show evidence (1 reference)

PMID:17627674 PARTIAL

"Ethosuximide has a narrow therapeutic profile. It is the drug of choice in the monotherapy or combination therapy of children with generalized absence (petit mal) epilepsy."

The reference supports the use of ethosuximide as a treatment for generalized absence epilepsy, which is related to Jeavons syndrome. However, it does not provide specific evidence for its use as an alternative or adjunctive therapy specifically for Jeavons syndrome.

Levetiracetam

Action: Pharmacotherapy NCIT:C15986

Agent: levetiracetam ↗

May be used as an alternative or adjunctive therapy.

Show evidence (2 references)

PMID:24798222 SUPPORT

"This case together with relevant literature data supports the view that the use of levetiracetam might be of benefit for female patients with Jeavons syndrome."

The literature mentions the use of levetiracetam resulting in clinical remission for a patient with Jeavons syndrome.

PMID:20486734 SUPPORT

"The efficacy of levetiracetam as an adjunctive therapy and as monotherapy for generalized and partial childhood epilepsies and for some types of specific epileptic syndromes of infancy and childhood (such as juvenile myoclonic epilepsy, benign rolandic epilepsy, and Jeavon syndrome) has been..."

The literature highlights that levetiracetam can be used as both adjunctive therapy and monotherapy for Jeavons Syndrome among other epileptic syndromes.

Avoidance of Provocative Stimuli

Action: medical action avoidance MAXO:0001014

Patients should avoid photic stimulation that may trigger seizures, such as flickering lights.

Show evidence (4 references)

PMID:14706045 PARTIAL

"Visually provoked seizures, in particular, can be prevented or treated by avoiding or altering the triggering stimulus. Apart from individual preventive measures (use of specific television or video screens, colored glasses, etc.), prevention and warning on a larger scale are helpful."

The literature mentions that avoidance of visually provoking stimuli, like flickering lights, can help in managing photosensitive seizures, though it does not specifically mention Jeavons Syndrome.

PMID:22946728 PARTIAL

"Recognized reflex seizure triggers are usually sensory and visual, such as television, discotheques, and video games."

This article suggests that visually evoked seizures can be triggered by stimuli like flickering lights, but it does not specifically address Jeavons Syndrome.

PMID:32861158 SUPPORT

"Spikes/spike-waves time-locked to the flash frequency during intermittent light stimulation in Jeavons syndrome."

This directly supports that photic stimulation, such as flickering lights, can trigger seizures in patients with Jeavons Syndrome.

+ 1 more reference

Avoidance of Triggering Stimuli

Action: medical action avoidance MAXO:0001014

Minimizing exposure to known triggers such as flashing lights or sleep deprivation.

Show evidence (1 reference)

PMID:32861158 NO_EVIDENCE

"Spikes/spike-waves time-locked to the flash frequency during intermittent light stimulation in Jeavons syndrome"

The focus is on the relationship between light stimulation and EEG patterns in Jeavons syndrome, with no mention of avoidance of triggers as a treatment method.

Sunglasses or Blue Light Filtering Glasses

Action: supportive care MAXO:0000950

Wear to reduce light sensitivity and potentially prevent seizures.

Show evidence (4 references)

PMID:14706045 NO_EVIDENCE

"Visually provoked seizures, in particular, can be prevented or treated by avoiding or altering the triggering stimulus. Apart from individual preventive measures (use of specific television or video screens, colored glasses, etc.), prevention and warning on a larger scale are helpful."

This reference mentions using colored glasses but does not specifically mention sunglasses or blue light filtering glasses for Jeavons syndrome.

PMID:30082241 NO_EVIDENCE

"We reviewed and described the epilepsy history, antiepileptic drug trials, and response to treatments."

This study focuses on drug treatments and does not mention sunglasses or blue light filtering glasses.

PMID:26552567 NO_EVIDENCE

"Jeavons syndrome as an occipital cortex initiated generalized epilepsy."

The reference discusses the occipital cortex's role in Jeavons syndrome but does not mention sunglasses or blue light filtering glasses as a treatment.

+ 1 more reference

🌍

Environmental Factors

2

Photic Stimulation

Exposure to flickering or flashing lights that can trigger seizures in photosensitive individuals.

Show evidence (3 references)

PMID:32861158 SUPPORT

"Spikes/spike-waves time-locked to the flash frequency during intermittent light stimulation in Jeavons syndrome."

This study indicates that flashing lights (photic stimulation) are associated with spikes and spike-waves in individuals with Jeavons syndrome, supporting the statement.

PMID:14706039 PARTIAL

"In addition to this 'transversal' presence of the photosensitive trait across various epilepsy types and diseases, some syndromes in which all, or almost all, seizures are induced by photic stimuli seem to have sufficient specificity and may be considered as syndromes of pure reflex..."

The study broadly discusses photosensitive epilepsy and its triggers but does not focus solely on Jeavons Syndrome. It implies a possible link but does not confirm the statement definitively.

PMID:28508035 NO_EVIDENCE

"'We propose that flashing light stimuli can be used as an experimental tool to investigate the visual function and plasticity of neuronal representations and perception after a critical period of neocortical plasticity.'"

This study discusses the effects of flashing lights on visual perception and plasticity but does not directly relate to Jeavons Syndrome or its triggering factors.

Sleep Deprivation

Insufficient sleep duration or quality that lowers seizure threshold and increases photosensitivity.

Show evidence (1 reference)

PMID:28314522 SUPPORT

"This study demonstrates that photosensitivity is enhanced after awakening from a short sleep following sleep deprivation. Thus, we recommend performing IPS after awakening to increase sensitivity to detect photoparoxysmal epileptiform discharges."

This reference indicates that sleep deprivation can enhance photosensitivity in patients, which can be a symptom exacerbation in conditions like Jeavons Syndrome, where photosensitivity is a significant factor.

{ }

Source YAML

click to show

name: Jeavons Syndrome
creation_date: '2025-12-04T16:57:31Z'
updated_date: '2026-02-27T22:30:28Z'
description: Jeavons syndrome is a genetic generalized epilepsy characterized by
  eyelid myoclonia with or without absences, photosensitivity, and eyelid
  closure-induced seizures. Onset typically occurs in childhood and the
  condition often persists into adulthood with variable drug responsiveness.
category: Complex
parents:
- Epilepsy
- Neurological Disorder
has_subtypes:
- name: EMA
  display_name: Eyelid Myoclonia with Absences (EMA)
  description: The most common presentation, characterized by eyelid myoclonia
    with or without absences.
  evidence:
  - reference: PMID:30082241
    reference_title: "Jeavons Syndrome: Clinical Features and Response to Treatment."
    supports: SUPPORT
    snippet: 'Criteria for Jeavons syndrome included all of the following: (1) eyelid
      myoclonia with or without absences...'
    explanation: The criteria for diagnosing Jeavons syndrome include eyelid
      myoclonia with or without absences, supporting the statement's
      description.
  - reference: PMID:37329145
    reference_title: "Clinical presentation and evaluation of epilepsy with eyelid myoclonia: Results of an international expert consensus panel."
    supports: SUPPORT
    snippet: There was consensus that generalized tonic-clonic and absence
      seizures are typically or occasionally seen in patients.
    explanation: The consensus specifies that absence seizures can be typically
      or occasionally seen in patients with Jeavons syndrome, supporting the
      statement.
- name: EMA+
  display_name: Eyelid Myoclonia with Absences and Photosensitivity (EMA+)
  description: Eyelid myoclonia with absences that are consistently provoked by
    photic stimulation.
  evidence:
  - reference: PMID:35394968
    reference_title: "Electrographic Features of Epilepsy With Eyelid Myoclonia With Photoparoxysmal Responses."
    supports: SUPPORT
    snippet: Epilepsy with eyelid myoclonia (EMA) is characterized by eyelid
      myoclonia, eyelid closure sensitivity, and photosensitivity.
    explanation: This reference confirms that EMA, a defining feature of Jeavons
      Syndrome, includes photosensitivity as well as eyelid myoclonia and
      absences.
  - reference: PMID:29722743
    reference_title: "Ongoing Photosensitivity in An Elderly Patient With Jeavons Sydrome."
    supports: SUPPORT
    snippet: Eyelid myoclonia with absences, generalized tonic-clonic seizures,
      and severe photosensitivity accompanied by eyelid myoclonia.
    explanation: This case report discusses a patient with Jeavons Syndrome
      exhibiting eyelid myoclonia with absences and severe photosensitivity,
      supporting the subtype EMA+ described in the statement.
prevalence:
- subtype: EMA
  population: Global
  percentage: 0.0001
  evidence:
  - reference: PMID:32554361
    reference_title: "Pitfalls in the diagnosis of Jeavons syndrome: a study of 32 cases and review of the literature."
    supports: REFUTE
    snippet: It is thought to be underdiagnosed rather than have a rare
      prevalence.
    explanation: The literature suggests that Jeavons syndrome is underdiagnosed
      instead of being extremely rare, indicating a higher prevalence than
      0.0001%.
progression:
- phase: Onset
  subtype: EMA
  age_range: 2-14
  evidence:
  - reference: PMID:32554361
    reference_title: "Pitfalls in the diagnosis of Jeavons syndrome: a study of 32 cases and review of the literature."
    supports: SUPPORT
    snippet: The mean age at seizure onset was 8.7+/-5.3 years and the mean age
      at admission to hospital was 17.8+/-10.7 years.
    explanation: This study provides data supporting the age range for seizure
      onset in Jeavons Syndrome patients, with a mean age of onset fitting
      within the range of 2 to 14 years.
pathophysiology:
- name: Complex Genetic Predisposition
  description: A complex genetic basis involving multiple genes contributes to
    susceptibility.
  evidence:
  - reference: PMID:30082241
    reference_title: "Jeavons Syndrome: Clinical Features and Response to Treatment."
    supports: SUPPORT
    snippet: Jeavons syndrome is an underreported epileptic syndrome
      characterized by eyelid myoclonia, eyelid closure-induced seizures or
      electroencephalography paroxysms, and photosensitivity. Drug-resistant
      epilepsy is common, but the prognostic factors and clinical course leading
      to drug resistance have not been well characterized.
    explanation: The abstract discusses drug resistance without specifying a
      particular genetic basis, but it does imply complexity by mentioning the
      variability in response to treatments and presence of multiple seizure
      types.
- name: Neuronal Hyperexcitability
  description: Neurons in the brain exhibit increased excitability, particularly
    in response to visual stimuli.
  cell_types:
  - preferred_term: Excitatory Glutamatergic Neuron
    description: Neurons that use glutamate as their primary neurotransmitter
      and mediate excitatory synaptic transmission.
    term:
      id: CL:0000679
      label: glutamatergic neuron
  biological_processes:
  - preferred_term: chemical synaptic transmission
    description: Process of synaptic signaling involving neurotransmitter
      release and receptor activation.
    term:
      id: GO:0007268
      label: chemical synaptic transmission
  evidence:
  - reference: PMID:21729035
    reference_title: "Jeavons syndrome existing as occipital cortex initiating generalized epilepsy."
    supports: PARTIAL
    snippet: 'We observed two neurophysiologic findings in JS: (1) focal interictal
      EDs from posterior head region; and (2) predominant focal posterior ictal EDs
      preceding generalized EDs.'
    explanation: While the study supports an increased excitability of neurons
      in response to visual stimuli (such as photic stimulation), it does not
      specifically identify excitatory glutamatergic neurons as the key cell
      type involved.
  - reference: PMID:31444362
    reference_title: "Glia-neuron interactions underlie state transitions to generalized seizures."
    supports: NO_EVIDENCE
    snippet: The transition from a preictal state to a generalized seizure leads
      to an abrupt increase in neural activity and connectivity, which is
      accompanied by a strong alteration in glia-neuron interactions and a
      massive increase in extracellular glutamate.
    explanation: This study discusses neural activity and connectivity
      alterations and increased extracellular glutamate during seizures but does
      not specifically associate these findings with Jeavons Syndrome.
- name: Disrupted Cortical Function
  description: Disruptions in normal brain function, especially in the visual
    cortex and thalamus, leading to seizures.
  locations:
  - preferred_term: Visual Cortex
    description: Brain region in the occipital lobe responsible for processing
      visual information.
    term:
      id: UBERON:0000411
      label: visual cortex
  - preferred_term: Thalamus
    description: Central brain structure that relays sensory and motor signals
      to the cerebral cortex.
    term:
      id: UBERON:0001897
      label: dorsal plus ventral thalamus
  biological_processes:
  - preferred_term: visual perception
    description: Process by which visual stimuli are received and interpreted by
      the nervous system.
    term:
      id: GO:0007601
      label: visual perception
  evidence:
  - reference: PMID:21729035
    reference_title: "Jeavons syndrome existing as occipital cortex initiating generalized epilepsy."
    supports: PARTIAL
    snippet: JS has been proposed as idiopathic generalized epilepsy (IGE)
      because of normal posterior dominant background activity and paroxysmal
      generalized ictal epileptiform discharges (EDs). However, we noticed
      subtle occipital EDs preceding EM and interictal posterior EDs using
      digital video-EEG... Further clinical observations of seizures induced by
      eye closure, photic stimulation, and hyperventilation along with EEG
      paroxysms would raise the possibility of the occipital cortex initiating
      generalized epilepsy network involving the brainstem, and thalamocortical
      and transcortical pathways in JS.
    explanation: The literature indicates involvement of the occipital cortex
      and mentions generalized epilepsy networks, which may include the
      thalamus. However, it does not explicitly support the claim that
      disruptions in the visual cortex and thalamus are the predominant
      mechanisms in Jeavons Syndrome.
  - reference: PMID:29880477
    reference_title: "Thalamocortical Connections and Executive Function in Pediatric Temporal and Frontal Lobe Epilepsy."
    supports: NO_EVIDENCE
    snippet: Largely accepted in the literature is the role the interconnections
      between the thalamus and cortex play in generalized epilepsy. However,
      thalamocortical involvement is less understood in focal epilepsy in terms
      of the effect of seizures on thalamocortical circuitry in the developing
      brain and subsequent cognitive outcome.
    explanation: This study discusses the role of thalamocortical connections in
      generalized and focal epilepsy but does not provide specific information
      on Jeavons Syndrome or its mechanisms.
phenotypes:
- category: Neurologic
  name: Eyelid Myoclonia
  description: Rapid, rhythmic jerking of the eyelids often accompanied by
    upward eye deviation and brief impairment of consciousness.
  frequency: VERY_FREQUENT
  diagnostic: true
  sequelae:
  - target: Impaired Visual Functioning During Episodes
    description: Transient visual impairment during myoclonic episodes due to
      involuntary eyelid movement.
    evidence:
    - reference: PMID:8270934
      reference_title: "Eyelid myoclonia with typical absences: an epilepsy syndrome."
      supports: PARTIAL
      snippet: Brief, typical absences occur with rapid eyelid myoclonia
        associated with retropulsive movements of the eyeballs and occasionally
        of the head. The seizures are of shorter duration than in childhood
        absence epilepsy, and are accompanied by less profound impairment of
        consciousness.
      explanation: While this reference describes the eyelid movements and
        consciousness impairment during episodes, it indirectly supports that
        rapid eyelid closure would impair visual function.
  evidence:
  - reference: PMID:32554361
    reference_title: "Pitfalls in the diagnosis of Jeavons syndrome: a study of 32 cases and review of the literature."
    supports: SUPPORT
    snippet: Jeavons syndrome (JS) is mainly characterized by eyelid myoclonia
      with or without absences.
    explanation: The literature supports the neurologic diagnostic of eyelid
      myoclonia as a high frequency phenotype of Jeavons Syndrome (JS).
  - reference: PMID:30685520
    reference_title: "Chewing induced reflex seizures (\"eating epilepsy\") and eye closure sensitivity as a common feature in pediatric patients with SYNGAP1 mutations: Review of literature and report of 8 cases."
    supports: SUPPORT
    snippet: Eyelid myoclonia, the most common seizure type in all 8 patients,
      were typically initiated by eating or other simple orofacial stimuli.
    explanation: This study confirms that eyelid myoclonia is a common and
      significant phenotype of JS, reinforcing the diagnostic.
  - reference: PMID:36216271
    reference_title: "STAG2 microduplication in a patient with eyelid myoclonia and absences and a review of EMA-related reported genes."
    supports: SUPPORT
    snippet: To the best of our knowledge, this is the first case of STAG2
      encephalopathy fulfilling all electroclinical criteria for epilepsy with
      eyelid myoclonia and absences (EMA), formally named Jeavons syndrome (JS).
    explanation: It confirms the diagnostic frequency of eyelid myoclonia as a
      defining characteristic of JS.
  - reference: PMID:14706039
    reference_title: "Epileptic syndromes and visually induced seizures."
    supports: PARTIAL
    snippet: Seizures induced by photic (or visual) stimuli or photosensitive
      seizures can be observed in generalized or focal, idiopathic, or
      symptomatic epilepsies...
    explanation: While photosensitivity is discussed, the specific association
      with eyelid myoclonia and its sequelae in JS is not the main focus.
  phenotype_term:
    preferred_term: Eyelid Myoclonia
    description: Rapid, rhythmic jerking of the eyelids often associated with
      brief impairment of consciousness.
    term:
      id: HP:0011149
      label: Absence seizure with eyelid myoclonia
- category: Neurologic
  name: Absences
  description: Brief episodes of impaired awareness typically lasting seconds,
    often accompanying eyelid myoclonia.
  frequency: VERY_FREQUENT
  phenotype_term:
    preferred_term: Absence seizure with eyelid myoclonia
    description: Brief impaired awareness seizures accompanied by eyelid jerking
      movements.
    term:
      id: HP:0011149
      label: Absence seizure with eyelid myoclonia
  evidence:
  - reference: PMID:15508923
    reference_title: "Eyelid myoclonia and absence."
    supports: SUPPORT
    snippet: Eyelid myoclonia and absence.
    explanation: The literature provides a title indicating a connection between
      eyelid myoclonia (a feature of Jeavons Syndrome) and absences, further
      supporting the statement.
- category: Neurologic
  name: Generalized Tonic-Clonic Seizures
  description: Convulsive seizures involving bilateral stiffening and rhythmic
    jerking, occurring in a subset of patients.
  frequency: OCCASIONAL
  phenotype_term:
    preferred_term: Bilateral tonic-clonic seizure with generalized onset
    description: Convulsive seizures with bilateral motor manifestations and
      generalized onset.
    term:
      id: HP:0025190
      label: Bilateral tonic-clonic seizure with generalized onset
  evidence:
  - reference: PMID:30082241
    reference_title: "Jeavons Syndrome: Clinical Features and Response to Treatment."
    supports: PARTIAL
    snippet: After a median follow-up of two years, 80% of patients had
      drug-resistant epilepsy and 70% experienced generalized tonic-clonic
      seizures.
    explanation: The statement is partially supported because generalized
      tonic-clonic seizures occur in 70% of patients, which suggests a high
      frequency rather than 'occasional'.
- category: Cognitive
  name: Mild Cognitive Impairment
  description: Subtle deficits in processing speed, verbal learning, and
    attention observed in some patients.
  frequency: OCCASIONAL
  evidence:
  - reference: PMID:26492104
    reference_title: "Preliminary neurocognitive outcomes in Jeavons syndrome."
    supports: PARTIAL
    snippet: All participants completed neuropsychological evaluations.
      Statistical analyses revealed performance that was below average on
      measures of global IQ, processing speed and rote, verbal learning coupled
      with average nonverbal reasoning, and sustained attention. There was also
      evidence of impaired higher-level verbal reasoning. While global IQ ranged
      from low average to borderline impaired, no participant could be
      accurately described as impaired or having intellectual disability (ID)
      given the consistently average performance noted on some higher-order
      tasks including nonverbal reasoning.
    explanation: The literature supports that there are cognitive impairments in
      Jeavons syndrome, but it does not explicitly classify these impairments as
      'mild cognitive impairment' (MCI) nor does it mention the frequency as
      'occasional'. The impairments are more specific and varied, making the
      statement partially correct but not completely accurate.
- category: Neurologic
  frequency: FREQUENT
  name: Photosensitivity
  description: Abnormal brain response to flickering light or visual patterns
    that triggers seizures or EEG abnormalities.
  notes: Increased sensitivity to light stimulation, which can provoke seizures
    or eyelid myoclonia. A common finding in Jeavons syndrome.
  evidence:
  - reference: PMID:30082241
    reference_title: "Jeavons Syndrome: Clinical Features and Response to Treatment."
    supports: SUPPORT
    snippet: Jeavons syndrome is an underreported epileptic syndrome
      characterized by eyelid myoclonia, eyelid closure-induced seizures or
      electroencephalography paroxysms, and photosensitivity.
    explanation: The abstract clearly states that photosensitivity is a
      characteristic feature of Jeavons syndrome.
- category: Developmental
  frequency: OCCASIONAL
  name: Developmental Delays
  description: Mildly delayed motor, language, or social milestones occurring in
    some patients with early seizure onset.
  notes: Mildly delayed motor, language, or social milestones in some patients,
    especially with early onset of seizures.
  evidence:
  - reference: PMID:30082241
    reference_title: "Jeavons Syndrome: Clinical Features and Response to Treatment."
    supports: NO_EVIDENCE
    snippet: 'BACKGROUND: Jeavons syndrome is an underreported epileptic syndrome
      characterized by eyelid myoclonia, eyelid closure-induced seizures or electroencephalography
      paroxysms, and photosensitivity.'
    explanation: The abstract does not mention developmental delays or any
      developmental milestones in relation to Jeavons Syndrome.
  - reference: PMID:30683501
    reference_title: "Jeavons Syndrome: An Overlooked Epilepsy Syndrome."
    supports: NO_EVIDENCE
    snippet: 'Jeavons Syndrome: An Overlooked Epilepsy Syndrome.'
    explanation: The abstract does not provide information on developmental
      delays or milestones in Jeavons Syndrome.
- name: Impaired Visual Functioning During Episodes
  description: Temporary visual disturbance during seizure activity affecting
    visual processing and perception.
  frequency: FREQUENT
  evidence:
  - reference: PMID:8270934
    reference_title: "Eyelid myoclonia with typical absences: an epilepsy syndrome."
    supports: SUPPORT
    snippet: Brief, typical absences occur with rapid eyelid myoclonia
      associated with retropulsive movements of the eyeballs and occasionally of
      the head. The seizures are of shorter duration than in childhood absence
      epilepsy, and are accompanied by less profound impairment of
      consciousness.
    explanation: The rapid eyelid movements and retropulsive eye movements
      during seizures directly impair visual function during episodes.
  - reference: PMID:32554361
    reference_title: "Pitfalls in the diagnosis of Jeavons syndrome: a study of 32 cases and review of the literature."
    supports: SUPPORT
    snippet: Jeavons syndrome (JS) is mainly characterized by eyelid myoclonia
      with or without absences.
    explanation: The characteristic eyelid myoclonia inherently causes transient
      visual impairment during episodes due to involuntary eyelid closure.
  phenotype_term:
    preferred_term: Impaired Visual Functioning During Episodes
    description: Transient visual disturbance caused by involuntary eyelid
      movements during seizure episodes.
    term:
      id: HP:0000572
      label: Visual loss
diagnosis:
- name: EEG with Generalized Spike-and-Wave Patterns
  description: Electroencephalography showing 3-6 Hz generalized spike and
    polyspike-wave discharges, often triggered by eye closure or photic
    stimulation.
  presence: Positive
  evidence:
  - reference: PMID:22931943
    reference_title: "[Clinical and electroencephalographic characteristics of Jeavons syndrome]."
    supports: SUPPORT
    snippet: Ictal EEG showed 3 - 6 Hz generalized spike and waves and
      polyspikes burst.
    explanation: The literature supports that the diagnosis of Jeavons Syndrome
      includes the presence of generalized spike-and-wave patterns in EEG.
genetic:
- name: SYNGAP1
  association: Associated
  notes: Synaptic Ras GTPase-activating protein in NMDA receptor complex;
    loss-of-function variants reported in EMA cases; implicates excitatory
    synaptic dysfunction and altered dendritic spine/plasticity.
  evidence:
  - reference: PMID:30541864
    reference_title: "SYNGAP1 encephalopathy: A distinctive generalized developmental and epileptic encephalopathy."
    supports: SUPPORT
    snippet: Seizure types included eyelid myoclonia with absences (65%),
      myoclonic seizures (34%), atypical (20%) and typical (18%) absences, and
      atonic seizures (14%), triggered by eating in 25%.
    explanation: This large cohort study of 57 SYNGAP1 patients found 65% had
      eyelid myoclonia with absences, demonstrating strong overlap with Jeavons
      syndrome phenotype.
  - reference: PMID:34070602
    reference_title: "Candidate Genes for Eyelid Myoclonia with Absences, Review of the Literature."
    supports: SUPPORT
    snippet: Based on this, four genes could be associated to this syndrome
      (SYNGAP1, KIA02022/NEXMIF, RORB, and CHD2).
    explanation: This review identifies SYNGAP1 as one of four candidate genes
      associated with eyelid myoclonia with absences (Jeavons syndrome).
- name: NEXMIF
  association: Associated
  notes: Also known as KIAA2022; X-linked gene producing EMA-like phenotypes,
    often pharmacoresistant; female-predominant effects via
    X-inactivation/mosaicism; synaptic/neurodevelopmental dysfunction from
    haploinsufficiency.
  evidence:
  - reference: PMID:34070602
    reference_title: "Candidate Genes for Eyelid Myoclonia with Absences, Review of the Literature."
    supports: SUPPORT
    snippet: Based on this, four genes could be associated to this syndrome
      (SYNGAP1, KIA02022/NEXMIF, RORB, and CHD2).
    explanation: This review identifies NEXMIF (KIAA2022) as one of four
      candidate genes associated with eyelid myoclonia with absences (Jeavons
      syndrome).
- name: RORB
  association: Associated
  notes: Nuclear receptor involved in neuronal differentiation; alterations
    reported in some EMA cases; may affect cortical network
    development/excitability.
  evidence:
  - reference: PMID:34070602
    reference_title: "Candidate Genes for Eyelid Myoclonia with Absences, Review of the Literature."
    supports: SUPPORT
    snippet: Based on this, four genes could be associated to this syndrome
      (SYNGAP1, KIA02022/NEXMIF, RORB, and CHD2).
    explanation: This review identifies RORB as one of four candidate genes
      associated with eyelid myoclonia with absences (Jeavons syndrome).
- name: CHD2
  association: Associated
  notes: Chromatin remodeling dysfunction may perturb neuronal gene expression
    and cortical excitability; variants observed in EMA cases with GTCS
    comorbidity.
  evidence:
  - reference: PMID:26262932
    reference_title: "CHD2 mutations are a rare cause of generalized epilepsy with myoclonic-atonic seizures."
    supports: PARTIAL
    snippet: Conversely, CHD2 could be responsible for a proper phenotype
      characterized by infantile-onset generalized epilepsy, intellectual
      disability, and photosensitivity, which might overlap with MAE,
      Lennox-Gastaut, Dravet, and Jeavons syndromes.
    explanation: The literature indicates that CHD2 mutations may overlap with
      phenotypes seen in Jeavons Syndrome, but it does not specifically state a
      direct genetic association exclusive to Jeavons Syndrome.
  - reference: PMID:34070602
    reference_title: "Candidate Genes for Eyelid Myoclonia with Absences, Review of the Literature."
    supports: SUPPORT
    snippet: Based on this, four genes could be associated to this syndrome
      (SYNGAP1, KIA02022/NEXMIF, RORB, and CHD2).
    explanation: This review identifies CHD2 as one of four candidate genes
      associated with eyelid myoclonia with absences (Jeavons syndrome).
- name: CSNK2B
  association: Associated
  notes: Casein kinase 2 beta; de novo missense variant reported in child with
    eyelid myoclonia; influences neuronal development and Wnt/β-catenin
    signaling; proposed novel candidate gene.
- name: SLC2A1
  association: Associated
  notes: GLUT1 glucose transporter; rare EMA reports suggest metabolic
    contributions in some patients; impaired glucose transport can alter
    neuronal metabolism and seizure threshold.
  evidence:
  - reference: PMID:28419980
    reference_title: "Evaluation of GLUT1 variation in non-acquired focal epilepsy."
    supports: REFUTE
    snippet: We did not detect any pathogenic mutations in SLC2A1 in this
      cohort. Our data suggests that the frequency of GLUT1 mutations in NAFE is
      low.
    explanation: The study indicates that no pathogenic mutations in SLC2A1 were
      found in the cohort, suggesting a low frequency of association with
      certain types of epilepsy, including Jeavons syndrome.
- name: KCNB1
  association: Associated
  notes: Voltage-gated potassium channel Kv2.1; rare variants reported in
    EMA-like presentations; perturbation can change neuronal repolarization and
    network excitability.
  evidence:
  - reference: PMID:34070602
    reference_title: "Candidate Genes for Eyelid Myoclonia with Absences, Review of the Literature."
    supports: PARTIAL
    snippet: Moreover, although there is not enough evidence yet to consider
      them as candidate for EMA, three more genes present also different
      alterations in some patients with clinical diagnosis of the disease
      (SLC2A1, NAA10, and KCNB1).
    explanation: This review notes KCNB1 alterations in some EMA patients,
      though evidence is limited.
- name: NAA10
  association: Associated
  notes: N-terminal acetyltransferase; rare EMA reports; N-terminal acetylation
    defects could impact multiple neuronal proteins and circuit development.
  evidence:
  - reference: PMID:34070602
    reference_title: "Candidate Genes for Eyelid Myoclonia with Absences, Review of the Literature."
    supports: PARTIAL
    snippet: Moreover, although there is not enough evidence yet to consider
      them as candidate for EMA, three more genes present also different
      alterations in some patients with clinical diagnosis of the disease
      (SLC2A1, NAA10, and KCNB1).
    explanation: This review notes NAA10 alterations in some EMA patients,
      though evidence is limited.
- name: GABRA1
  association: Associated
  evidence:
  - reference: PMID:14631097
    reference_title: "Absence of GABRA1 Ala322Asp mutation in juvenile myoclonic epilepsy families from India."
    supports: REFUTE
    snippet: An Ala322Asp mutation in the GABRA1 gene was recently reported to
      be responsible for causing the autosomal dominant (AD) form of juvenile
      myoclonic epilepsy (JME) in a French-Canadian family.
    explanation: The abstract does not mention Jeavons syndrome and focuses on
      juvenile myoclonic epilepsy related to GABRA1 mutations in a different
      population.
  - reference: PMID:30082241
    reference_title: "Jeavons Syndrome: Clinical Features and Response to Treatment."
    supports: NO_EVIDENCE
    snippet: We identified 30 patients who met the diagnostic criteria of
      Jeavons syndrome at a single institution...
    explanation: The study focuses on clinical features and treatment response
      in Jeavons syndrome without mentioning GABRA1 or a genetic association.
  - reference: PMID:20074235
    reference_title: "The Epilepsy Genetic Association Database (epiGAD): analysis of 165 genetic association studies, 1996-2008."
    supports: NO_EVIDENCE
    snippet: We have created the Epilepsy Genetic Association Database
      (epiGAD)...
    explanation: The database mentions epilepsy genetic association studies but
      does not specifically address Jeavons syndrome or GABRA1.
environmental:
- name: Photic Stimulation
  description: Exposure to flickering or flashing lights that can trigger
    seizures in photosensitive individuals.
  synonyms:
  - Flashing Lights
  effect: Triggering Factor
  evidence:
  - reference: PMID:32861158
    reference_title: "Spikes/spike-waves time-locked to the flash frequency during intermittent light stimulation in Jeavons syndrome."
    supports: SUPPORT
    snippet: Spikes/spike-waves time-locked to the flash frequency during
      intermittent light stimulation in Jeavons syndrome.
    explanation: This study indicates that flashing lights (photic stimulation)
      are associated with spikes and spike-waves in individuals with Jeavons
      syndrome, supporting the statement.
  - reference: PMID:14706039
    reference_title: "Epileptic syndromes and visually induced seizures."
    supports: PARTIAL
    snippet: In addition to this 'transversal' presence of the photosensitive
      trait across various epilepsy types and diseases, some syndromes in which
      all, or almost all, seizures are induced by photic stimuli seem to have
      sufficient specificity and may be considered as syndromes of pure reflex
      photosensitive epilepsy.
    explanation: The study broadly discusses photosensitive epilepsy and its
      triggers but does not focus solely on Jeavons Syndrome. It implies a
      possible link but does not confirm the statement definitively.
  - reference: PMID:28508035
    reference_title: "Flashing Lights Induce Prolonged Distortions in Visual Cortical Responses and Visual Perception."
    supports: NO_EVIDENCE
    snippet: '''We propose that flashing light stimuli can be used as an experimental
      tool to investigate the visual function and plasticity of neuronal representations
      and perception after a critical period of neocortical plasticity.'''
    explanation: This study discusses the effects of flashing lights on visual
      perception and plasticity but does not directly relate to Jeavons Syndrome
      or its triggering factors.
  exposure_term:
    preferred_term: Light exposure
    description: Exposure to visible light, particularly flickering or patterned
      stimuli that can provoke seizures.
    term:
      id: XCO:0000284
      label: controlled visible light exposure
- name: Sleep Deprivation
  description: Insufficient sleep duration or quality that lowers seizure
    threshold and increases photosensitivity.
  effect: Exacerbates Symptoms
  exposure_term:
    preferred_term: Sleep deprivation
    description: Restriction or deprivation of sleep that increases seizure
      susceptibility.
    term:
      id: XCO:0001069
      label: sleep restriction
  evidence:
  - reference: PMID:28314522
    reference_title: "Increased photosensitivity following short sleep in sleep deprived patients."
    supports: SUPPORT
    snippet: This study demonstrates that photosensitivity is enhanced after
      awakening from a short sleep following sleep deprivation. Thus, we
      recommend performing IPS after awakening to increase sensitivity to detect
      photoparoxysmal epileptiform discharges.
    explanation: This reference indicates that sleep deprivation can enhance
      photosensitivity in patients, which can be a symptom exacerbation in
      conditions like Jeavons Syndrome, where photosensitivity is a significant
      factor.
treatments:
- name: Valproic Acid
  role: Anticonvulsant
  description: First-line treatment, effective in controlling seizures in many
    patients.
  evidence:
  - reference: PMID:6771426
    reference_title: "Valproic acid therapy in childhood epilepsy."
    supports: PARTIAL
    snippet: Valproic acid, used alone or in combination with other
      anticonvulsants in 100 children with epilepsy, improved seizure control in
      all age groups.
    explanation: The reference supports the efficacy of Valproic Acid in
      controlling seizures, but it does not specifically mention Jeavons
      Syndrome or describe it as a first-line treatment.
  - reference: PMID:11393330
    reference_title: "Treatment of typical absence seizures and related epileptic syndromes."
    supports: PARTIAL
    snippet: Valproic acid controls absences in 75% of patients and also GTCS
      (70%) and myoclonic jerks (75%); however, it may be undesirable for some
      women.
    explanation: Valproic acid is mentioned as effective in controlling certain
      types of seizures common in Jeavons Syndrome (myoclonic jerks), but again
      it does not specifically refer to Jeavons Syndrome or define it as
      first-line treatment.
  treatment_term:
    preferred_term: Pharmacotherapy
    description: First-line anticonvulsant treatment using valproic acid for
      seizure control.
    term:
      id: NCIT:C15986
      label: Pharmacotherapy
    therapeutic_agent:
    - preferred_term: valproic acid
      term:
        id: CHEBI:39867
        label: valproic acid
- name: Ethosuximide
  role: Anticonvulsant
  description: May be used as an alternative or adjunctive therapy.
  evidence:
  - reference: PMID:17627674
    reference_title: "Ethosuximide: from bench to bedside."
    supports: PARTIAL
    snippet: Ethosuximide has a narrow therapeutic profile. It is the drug of
      choice in the monotherapy or combination therapy of children with
      generalized absence (petit mal) epilepsy.
    explanation: The reference supports the use of ethosuximide as a treatment
      for generalized absence epilepsy, which is related to Jeavons syndrome.
      However, it does not provide specific evidence for its use as an
      alternative or adjunctive therapy specifically for Jeavons syndrome.
  treatment_term:
    preferred_term: Pharmacotherapy
    description: Anticonvulsant treatment primarily targeting absence seizures.
    term:
      id: NCIT:C15986
      label: Pharmacotherapy
    therapeutic_agent:
    - preferred_term: ethosuximide
      term:
        id: CHEBI:4887
        label: ethosuximide
- name: Levetiracetam
  role: Anticonvulsant
  description: May be used as an alternative or adjunctive therapy.
  evidence:
  - reference: PMID:24798222
    reference_title: "Levetiracetam as alternative treatment in Jeavons syndrome."
    supports: SUPPORT
    snippet: This case together with relevant literature data supports the view
      that the use of levetiracetam might be of benefit for female patients with
      Jeavons syndrome.
    explanation: The literature mentions the use of levetiracetam resulting in
      clinical remission for a patient with Jeavons syndrome.
  - reference: PMID:20486734
    reference_title: "Levetiracetam in childhood epilepsy."
    supports: SUPPORT
    snippet: The efficacy of levetiracetam as an adjunctive therapy and as
      monotherapy for generalized and partial childhood epilepsies and for some
      types of specific epileptic syndromes of infancy and childhood (such as
      juvenile myoclonic epilepsy, benign rolandic epilepsy, and Jeavon
      syndrome) has been demonstrated.
    explanation: The literature highlights that levetiracetam can be used as
      both adjunctive therapy and monotherapy for Jeavons Syndrome among other
      epileptic syndromes.
  treatment_term:
    preferred_term: Pharmacotherapy
    description: Broad-spectrum anticonvulsant that may be used as alternative
      or adjunctive therapy.
    term:
      id: NCIT:C15986
      label: Pharmacotherapy
    therapeutic_agent:
    - preferred_term: levetiracetam
      term:
        id: CHEBI:6437
        label: levetiracetam
- name: Avoidance of Provocative Stimuli
  description: Patients should avoid photic stimulation that may trigger
    seizures, such as flickering lights.
  evidence:
  - reference: PMID:14706045
    reference_title: "Treatment of photosensitivity."
    supports: PARTIAL
    snippet: Visually provoked seizures, in particular, can be prevented or
      treated by avoiding or altering the triggering stimulus. Apart from
      individual preventive measures (use of specific television or video
      screens, colored glasses, etc.), prevention and warning on a larger scale
      are helpful.
    explanation: The literature mentions that avoidance of visually provoking
      stimuli, like flickering lights, can help in managing photosensitive
      seizures, though it does not specifically mention Jeavons Syndrome.
  - reference: PMID:22946728
    reference_title: "Provoked and reflex seizures: surprising or common?"
    supports: PARTIAL
    snippet: Recognized reflex seizure triggers are usually sensory and visual,
      such as television, discotheques, and video games.
    explanation: This article suggests that visually evoked seizures can be
      triggered by stimuli like flickering lights, but it does not specifically
      address Jeavons Syndrome.
  - reference: PMID:32861158
    reference_title: "Spikes/spike-waves time-locked to the flash frequency during intermittent light stimulation in Jeavons syndrome."
    supports: SUPPORT
    snippet: Spikes/spike-waves time-locked to the flash frequency during
      intermittent light stimulation in Jeavons syndrome.
    explanation: This directly supports that photic stimulation, such as
      flickering lights, can trigger seizures in patients with Jeavons Syndrome.
  - reference: PMID:29555355
    reference_title: "Clinical and electrographic features of sunflower syndrome."
    supports: SUPPORT
    snippet: Self-induced seizures were predominantly eyelid myoclonia +/-
      absences... EEG demonstrated a normal background with 3-4 Hz spike waves
      +/- polyspike waves as well as a photoparoxysmal response.
    explanation: This reference indicates that photic stimulation can induce
      seizures in patients with Jeavons Syndrome, thus supporting the need to
      avoid such stimuli.
  treatment_term:
    preferred_term: medical action avoidance
    description: Behavioral intervention to avoid exposure to known seizure
      triggers.
    term:
      id: MAXO:0001014
      label: medical action avoidance
- name: Avoidance of Triggering Stimuli
  description: Minimizing exposure to known triggers such as flashing lights or
    sleep deprivation.
  evidence:
  - reference: PMID:32861158
    reference_title: "Spikes/spike-waves time-locked to the flash frequency during intermittent light stimulation in Jeavons syndrome."
    supports: NO_EVIDENCE
    snippet: Spikes/spike-waves time-locked to the flash frequency during
      intermittent light stimulation in Jeavons syndrome
    explanation: The focus is on the relationship between light stimulation and
      EEG patterns in Jeavons syndrome, with no mention of avoidance of triggers
      as a treatment method.
  treatment_term:
    preferred_term: medical action avoidance
    description: Lifestyle modification to minimize exposure to photic and other
      seizure triggers.
    term:
      id: MAXO:0001014
      label: medical action avoidance
- name: Sunglasses or Blue Light Filtering Glasses
  description: Wear to reduce light sensitivity and potentially prevent
    seizures.
  evidence:
  - reference: PMID:14706045
    reference_title: "Treatment of photosensitivity."
    supports: NO_EVIDENCE
    snippet: Visually provoked seizures, in particular, can be prevented or
      treated by avoiding or altering the triggering stimulus. Apart from
      individual preventive measures (use of specific television or video
      screens, colored glasses, etc.), prevention and warning on a larger scale
      are helpful.
    explanation: This reference mentions using colored glasses but does not
      specifically mention sunglasses or blue light filtering glasses for
      Jeavons syndrome.
  - reference: PMID:30082241
    reference_title: "Jeavons Syndrome: Clinical Features and Response to Treatment."
    supports: NO_EVIDENCE
    snippet: We reviewed and described the epilepsy history, antiepileptic drug
      trials, and response to treatments.
    explanation: This study focuses on drug treatments and does not mention
      sunglasses or blue light filtering glasses.
  - reference: PMID:26552567
    reference_title: "Jeavons syndrome as an occipital cortex initiated generalized epilepsy: Further evidence from a patient with a photic-induced occipital seizure."
    supports: NO_EVIDENCE
    snippet: Jeavons syndrome as an occipital cortex initiated generalized
      epilepsy.
    explanation: The reference discusses the occipital cortex's role in Jeavons
      syndrome but does not mention sunglasses or blue light filtering glasses
      as a treatment.
  - reference: PMID:32861158
    reference_title: "Spikes/spike-waves time-locked to the flash frequency during intermittent light stimulation in Jeavons syndrome."
    supports: NO_EVIDENCE
    snippet: Spikes/spike-waves time-locked to the flash frequency during
      intermittent light stimulation in Jeavons syndrome.
    explanation: This reference discusses EEG characteristics in Jeavons
      syndrome without mentioning sunglasses or blue light filtering glasses as
      a treatment.
  treatment_term:
    preferred_term: supportive care
    description: Use of protective eyewear to reduce light-induced seizure
      triggers.
    term:
      id: MAXO:0000950
      label: supportive care
disease_term:
  preferred_term: eyelid myoclonia with absences
  description: A genetic generalized epilepsy syndrome characterized by eyelid
    myoclonia, photosensitivity, and eye closure-induced seizures.
  term:
    id: MONDO:0015346
    label: epilepsy with eyelid myoclonia
references:
- reference: DOI:10.1002/ana.24236
  title: The visual system in eyelid myoclonia with absences
  findings: []
- reference: DOI:10.14744/epilepsi.2016.88319
  title: 'Jeavons Syndrome: 12 Cases'
  findings: []
- reference: DOI:10.3389/fped.2025.1583346
  title: 'Case Report: A case of Poirier–Bienvenu neurodevelopmental syndrome manifesting
    primarily as eyelid myoclonia'
  findings: []
- reference: DOI:10.3390/ijms22115609
  title: Candidate Genes for Eyelid Myoclonia with Absences, Review of the
    Literature
  findings: []

📚

References & Deep Research

References

4

DOI:10.1002/ana.24236

The visual system in eyelid myoclonia with absences

No top-level findings curated for this source.

DOI:10.14744/epilepsi.2016.88319

Jeavons Syndrome: 12 Cases

No top-level findings curated for this source.

DOI:10.3389/fped.2025.1583346

Case Report: A case of Poirier–Bienvenu neurodevelopmental syndrome manifesting primarily as eyelid myoclonia

No top-level findings curated for this source.

DOI:10.3390/ijms22115609

Candidate Genes for Eyelid Myoclonia with Absences, Review of the Literature

No top-level findings curated for this source.

Deep Research

2

Disorder ▸

Disorder

Name: Jeavons Syndrome
Category: Complex
Existing deep-research providers: falcon
Existing evidence reference count in YAML: 59

Key Pathophysiology Nodes

Complex Genetic Predisposition
Neuronal Hyperexcitability
Disrupted Cortical Function
Deep research literature mapping

Citation Inventory (for evidence mapping)

DOI:10.1002/ana.24236
DOI:10.14744/epilepsi.2016.88319
DOI:10.21307/joepi-2015-0033
DOI:10.3389/fped.2025.1583346
DOI:10.3390/ijms22115609

Falcon ▸

Pathophysiology description (current understanding)

Edison Scientific Literature 14 citations 2025-12-15T09:18:46.084192

Pathophysiology description (current understanding)

Jeavons syndrome (JS), also termed epilepsy with eyelid myoclonia (EEM/EMA), is characterized by a reflex, visually triggered generalized epilepsy with a core electroclinical triad: eyelid myoclonia with absences, photosensitivity, and generalized epileptiform paroxysms specifically induced by eye closure and photic stimulation. Covanis summarizes: JS is defined by “eyelid myoclonia, absences/other generalized seizures, and EEG paroxysms… specifically induced by voluntary/on-command eye closure and by photosensitivity,” with events reliably evoked in light and absent in total darkness (URLs/DOIs below) (covanis2015jeavonssyndrome–updatedreview pages 1-2, covanis2015jeavonssyndrome–updatedreview pages 7-8). Vaudano et al. provide EEG–fMRI and morphometric evidence implicating occipital visual cortex and posterior thalamus (pulvinar) in eye-closure sensitivity (ECS), with increased BOLD responses to eye closure in visual cortex/pulvinar and gray-matter alterations in visual cortex and frontal eye fields (FEF), consistent with a network involving visual cortices, thalamus, and eye-movement control circuits (vaudano2014thevisualsystem pages 1-2).

Mechanistically, the initial trigger is voluntary/on-command slow eye closure in the presence of uninterrupted light; passive eye closure is not sufficient. Eye closure and intermittent photic stimulation (IPS) drive occipital cortical activation, rapidly generalizing via subcortical thalamo-cortical circuits to produce brief polyspike–wave or spike–wave discharges (≈3–6 Hz) and clinical eyelid myoclonia with behavioral arrest. Covanis notes the eye-closure trigger window “starts immediately after closing the eyes and only lasts up to 3 sec,” and paroxysms “do not occur in total darkness,” underscoring the necessity of light input and cortical visual processing (covanis2015jeavonssyndrome–updatedreview pages 7-8, covanis2015jeavonssyndrome–updatedreview pages 2-4). Vaudano et al. observed higher BOLD responses to eye closure in visual cortex and posterior thalamus and decreased gray matter in bilateral FEF, suggesting that voluntary eyelid closure engages FEF→occipital interactions that, in genetically predisposed brains, tip visual–thalamo-cortical networks into generalized discharges (vaudano2014thevisualsystem pages 1-2).

Genetically, JS is strongly predisposed but genetically heterogeneous. A 2021 literature review synthesizes candidate genes with EMA/JS phenotypes: SYNGAP1, NEXMIF/KIAA2022, RORB, and CHD2, with additional reports implicating SLC2A1, NAA10, and KCNB1 in EMA-like phenotypes; no single causative gene explains all cases (mayo2021candidategenesfor pages 1-2, mayo2021candidategenesfor pages 26-27). A 2025 case report proposes CSNK2B as a novel candidate based on a de novo variant in a child with primary eyelid myoclonia, with mechanistic discussion of CK2 signaling in neuronal development (he2025casereporta pages 3-7). Clinically, JS shows childhood onset (peak 6–8 years), female predominance, photosensitivity, and eye-closure–provoked generalized paroxysms; prevalence in idiopathic generalized epilepsies is reported around 7–13% in some series (tuac2017jeavonssyndrome12 pages 1-2).

Domain	Item	Evidence Summary	Key Mechanistic Notes	Year	Source	DOI/URL	Citation ID
Clinical/Diagnostic	Diagnostic triad (eyelid myoclonia + absences + photosensitivity)	Jeavons syndrome is defined by a core triad of eyelid myoclonia with absences, photosensitivity, and EEG/paroxysms provoked by eye closure or IPS.	Reflex visual-triggered generalized EEG paroxysms underlie the syndrome.	2015	A. Covanis	https://doi.org/10.21307/joepi-2015-0033	(covanis2015jeavonssyndrome–updatedreview pages 1-2)
Mechanism	Eye-closure-induced paroxysms	Voluntary/on-command slow eye closure in light reliably provokes brief bilateral spike/spike–wave discharges and eyelid jerks within ~0.5–4 s.	Eye-closure engages cortical circuits (occipital) and triggers generalized discharges via subcortical (thalamo-cortical) pathways.	2015	A. Covanis	https://doi.org/10.21307/joepi-2015-0033	(covanis2015jeavonssyndrome–updatedreview pages 2-4)
Mechanism	Photosensitivity (light vs darkness)	Paroxysms require uninterrupted light: events do not occur in total darkness and IPS directly evokes occipital-driven discharges.	Photic input to occipital cortex (not brainstem photic blink) is necessary to trigger generalized responses.	2015	A. Covanis	https://doi.org/10.21307/joepi-2015-0033	(covanis2015jeavonssyndrome–updatedreview pages 7-8)
Anatomy/Network	Visual cortex and pulvinar involvement	fMRI/EEG shows increased BOLD to eye closure in visual cortex and posterior thalamus (pulvinar) with gray-matter differences in occipital regions.	Occipital hyperexcitability and altered visual–thalamic connectivity facilitate reflex epileptogenesis.	2014	Vaudano et al.	https://doi.org/10.1002/ana.24236	(vaudano2014thevisualsystem pages 1-2)
Mechanism/Network	Thalamo-cortical spread	Generalized discharges are proposed to spread from occipital cortex to frontal regions via subcortical/thalamo-cortical circuits.	Thalamo-cortical loops mediate rapid generalization of visually-triggered cortical discharges.	2015	A. Covanis	https://doi.org/10.21307/joepi-2015-0033	(covanis2015jeavonssyndrome–updatedreview pages 7-8)
Anatomy/Network	Frontal eye fields (FEF) involvement	Structural/functional differences include decreased gray matter in bilateral frontal eye fields and engagement of eye-movement control networks during provocation.	Voluntary eye closure activates FEF which can trigger occipital cortex and downstream epileptic responses.	2014	Vaudano et al.	https://doi.org/10.1002/ana.24236	(vaudano2014thevisualsystem pages 1-2)
Gene	SYNGAP1	SYNGAP1 loss-of-function variants reported in EMA cases; SYNGAP1 encodes a synaptic Ras-GAP in NMDA receptor complexes affecting excitatory synaptic function.	Implicates excitatory synaptic dysfunction and altered dendritic spine/plasticity contributing to hyperexcitability.	2021	Mayo et al.	https://doi.org/10.3390/ijms22115609	(mayo2021candidategenesfor pages 1-2)
Gene	NEXMIF (KIAA2022)	NEXMIF variants produce EMA-like phenotypes, often pharmacoresistant; X-linked gene with female-predominant effects via XCI/mosaicism hypotheses.	Synaptic/neurodevelopmental dysfunction from haploinsufficiency can produce myoclonic/absence seizures and early-onset EMA spectrum.	2021	Mayo et al.	https://doi.org/10.3390/ijms22115609	(mayo2021candidategenesfor pages 26-27)
Gene	RORB	RORB alterations have been reported in some EMA cases and are proposed as candidate contributors to generalized photosensitive phenotypes.	RORB encodes a nuclear receptor involved in neuronal differentiation that may affect cortical network development/excitability.	2021	Mayo et al.	https://doi.org/10.3390/ijms22115609	(mayo2021candidategenesfor pages 1-2)
Gene	CHD2	CHD2 variants have been observed in a small number of EMA cases and are considered possible contributors, especially with GTCS comorbidity.	CHD2 chromatin remodeling dysfunction may perturb neuronal gene expression and cortical excitability.	2021	Mayo et al.	https://doi.org/10.3390/ijms22115609	(mayo2021candidategenesfor pages 26-27)
Gene	SLC2A1	SLC2A1 (GLUT1) alterations reported in isolated EMA cases; evidence insufficient to confirm causality but indicates metabolic contributions in some patients.	Impaired glucose transport can alter neuronal metabolism and seizure threshold in susceptible networks.	2021	Mayo et al.	https://doi.org/10.3390/ijms22115609	(mayo2021candidategenesfor pages 26-27)
Gene	KCNB1	Rare KCNB1 variants have been reported in EMA-like presentations, suggesting ion-channel dysfunction as a possible mechanism in select patients.	Voltage-gated potassium channel perturbation can change neuronal repolarization and network excitability.	2021	Mayo et al.	https://doi.org/10.3390/ijms22115609	(mayo2021candidategenesfor pages 26-27)
Gene	NAA10	NAA10 variants appear in a few EMA reports; causative role remains uncertain but may relate to broader neurodevelopmental perturbation.	N-terminal acetylation defects could impact multiple neuronal proteins and circuit development.	2021	Mayo et al.	https://doi.org/10.3390/ijms22115609	(mayo2021candidategenesfor pages 26-27)
Gene/Case	CSNK2B (case report)	A de novo CSNK2B missense variant (p.Thr90Pro) was reported in a child presenting primarily with eyelid myoclonia, proposed as a likely pathogenic candidate.	CSNK2B (CK2 beta) influences neuronal development, Wnt/β-catenin signaling, and may affect network formation leading to hyperexcitability.	2025	He et al.	https://doi.org/10.3389/fped.2025.1583346	(he2025casereporta pages 3-7)
Epidemiology/Clinical	Female predominance; prevalence among IGE (7–13%)	EMA shows female predominance and accounts for approximately 7–13% of idiopathic generalized epilepsies with absences in some series.	Demographics and familial aggregation support a genetic predisposition with sex-biased expression.	2017	Tuaç et al.	https://doi.org/10.14744/epilepsi.2016.88319	(tuac2017jeavonssyndrome12 pages 1-2)

Table: Compact table summarizing pathophysiology, key genes, network anatomy, and epidemiology of Jeavons syndrome with evidence citations to source context IDs; useful for rapid inclusion in a disease knowledge base.

1. Core Pathophysiology

Primary mechanisms:
Reflex visual-triggered cortical hyperexcitability. Eye closure under light and IPS activate occipital cortex, with “eye-closure period”–linked paroxysms within 0.5–4 s and absence in total darkness (vaudano2014thevisualsystem pages 1-2, covanis2015jeavonssyndrome–updatedreview pages 7-8, covanis2015jeavonssyndrome–updatedreview pages 2-4).
Rapid thalamo-cortical generalization. Generalized discharges spread from occipital cortex to frontal regions “most likely through a subcortical circuit,” implicating thalamo-cortical loops and pulvinar (covanis2015jeavonssyndrome–updatedreview pages 7-8, vaudano2014thevisualsystem pages 1-2).
Eye-movement control network engagement. Decreased gray matter in bilateral frontal eye fields and BOLD engagement of saccade/pursuit networks during eye closure highlight FEF–visual cortex coupling in the reflex pathway (vaudano2014thevisualsystem pages 1-2).
Dysregulated pathways:
Visual processing and thalamo-cortical oscillatory coupling (visual cortex–pulvinar–cortex). IPS and eye closure require light, indicating cortical visual pathway dependence rather than brainstem reflex pathways (covanis2015jeavonssyndrome–updatedreview pages 7-8, vaudano2014thevisualsystem pages 1-2).
Synaptic signaling in excitatory networks (NMDA receptor complex/SYNGAP1; chromatin remodeling/CHD2; nuclear receptor RORB influencing neuronal differentiation) inferred from candidate gene biology (mayo2021candidategenesfor pages 1-2, mayo2021candidategenesfor pages 26-27).
Cellular processes affected:
Cortical network excitability and synchronization leading to generalized 3–6 Hz spike–wave bursts and eyelid myoclonia/absences (covanis2015jeavonssyndrome–updatedreview pages 1-2, covanis2015jeavonssyndrome–updatedreview pages 7-8).
Eye-closure motor program activation via FEF integrated with visual cortex drive (vaudano2014thevisualsystem pages 1-2).

2. Key Molecular Players

Genes/Proteins (HGNC):
SYNGAP1 (HGNC:11494) – synaptic Ras GTPase-activating protein in NMDA receptor complex; LoF variants reported in EMA cases (mayo2021candidategenesfor pages 1-2, mayo2021candidategenesfor pages 26-27). DOI: https://doi.org/10.3390/ijms22115609 (2021-05).
NEXMIF/KIAA2022 (HGNC:28907) – X-linked; variants yield EMA-like phenotypes, often pharmacoresistant; XCI mosaicism posited in female predominance (mayo2021candidategenesfor pages 26-27). DOI: https://doi.org/10.3390/ijms22115609 (2021-05).
RORB (HGNC:10260) – nuclear receptor; implicated in some EMA cases; role in neuronal differentiation and cortical network maturation (mayo2021candidategenesfor pages 1-2). DOI: https://doi.org/10.3390/ijms22115609 (2021-05).
CHD2 (HGNC:2018) – chromatin remodeler; variants observed in EMA and photosensitive epilepsies (mayo2021candidategenesfor pages 26-27). DOI: https://doi.org/10.3390/ijms22115609 (2021-05).
SLC2A1 (HGNC:11005) – GLUT1; rare EMA reports suggest metabolic contributions (mayo2021candidategenesfor pages 26-27). DOI: https://doi.org/10.3390/ijms22115609 (2021-05).
KCNB1 (HGNC:6239) – Kv2.1 potassium channel; rare EMA-like presentations (mayo2021candidategenesfor pages 26-27). DOI: https://doi.org/10.3390/ijms22115609 (2021-05).
NAA10 (HGNC:13354) – N-terminal acetyltransferase; rare EMA reports (mayo2021candidategenesfor pages 26-27). DOI: https://doi.org/10.3390/ijms22115609 (2021-05).
CSNK2B (HGNC:2456) – Casein kinase 2 beta; de novo missense in a child with eyelid myoclonia; proposed novel candidate (he2025casereporta pages 3-7). DOI: https://doi.org/10.3389/fped.2025.1583346 (2025-09).
Chemical entities (CHEBI) and therapeutics (contextual):
While not mechanistically proven for JS herein, broad generalized epilepsy management often uses valproic acid (CHEBI:39867), which was “most preferred” in one JS series; this reflects clinical practice rather than a mechanistic probe (tuac2017jeavonssyndrome12 pages 1-2).
Cell types (CL):
Excitatory cortical pyramidal neurons (CL:0000624) within occipital cortex implicated by SYNGAP1/NMDA complex biology and visual-cortex driven fMRI activation (vaudano2014thevisualsystem pages 1-2, mayo2021candidategenesfor pages 1-2).
Thalamic relay neurons (CL:0000700), particularly pulvinar-associated relays, participate in visually driven thalamo-cortical propagation (vaudano2014thevisualsystem pages 1-2).
Anatomical locations (UBERON):
Occipital lobe/visual cortex (UBERON:0000956) and primary visual cortex (V1; UBERON:0002436) show increased BOLD/gray-matter differences; posterior thalamus/pulvinar (UBERON:0001896) implicated; frontal eye fields (part of prefrontal/frontal cortex; UBERON:0006479) exhibit structural differences (vaudano2014thevisualsystem pages 1-2).

3. Biological Processes (GO terms; disrupted)

Visual perception and photic stimulus processing: GO:0007601 (visual perception); GO:0009584 (detection of visible light). Eye-closure sensitivity requires light; absence in darkness indicates cortical visual pathway dependency (covanis2015jeavonssyndrome–updatedreview pages 7-8, covanis2015jeavonssyndrome–updatedreview pages 2-4).
Thalamo-cortical rhythm generation and synchronization: GO:0021795 (cerebral cortex development; inferred), GO:0007268 (chemical synaptic transmission), GO:0019228 (neuronal action potential). Occipital-driven discharges generalize via thalamo-cortical circuits (covanis2015jeavonssyndrome–updatedreview pages 7-8, vaudano2014thevisualsystem pages 1-2).
Glutamatergic synaptic signaling and plasticity: GO:0098978 (glutamatergic synaptic transmission), GO:0099578 (NMDA receptor signaling pathway). SYNGAP1 dysfunction implicates NMDA complex signaling and dendritic spine plasticity (mayo2021candidategenesfor pages 1-2, mayo2021candidategenesfor pages 26-27).
Chromatin remodeling and neuronal gene expression: GO:0006338 (chromatin remodeling). CHD2 perturbation suggests altered neuronal transcriptional programs affecting excitability (mayo2021candidategenesfor pages 26-27).

4. Cellular Components (GO:CC)

Postsynaptic density (GO:0014069) and NMDA receptor complex (GO: NMDA receptor complex; e.g., GO:0017147). SYNGAP1 localizes to PSD and NMDA complexes in excitatory synapses (mayo2021candidategenesfor pages 1-2).
Thalamic nuclei (pulvinar) and occipital cortical laminae as circuit loci for initiation/propagation (anatomical evidence via fMRI/morphometry) (vaudano2014thevisualsystem pages 1-2).

5. Disease Progression

Sequence of events: 1) Genetic predisposition primes visual–thalamo-cortical circuits (covanis2015jeavonssyndrome–updatedreview pages 1-2). 2) Voluntary/on-command slow eye closure in light initiates occipital cortical activation within 0.5–4 s (ECS window), often accompanied by upward gaze and eyelid jerks (vaudano2014thevisualsystem pages 1-2, covanis2015jeavonssyndrome–updatedreview pages 7-8). 3) Occipital paroxysms rapidly generalize via thalamo-cortical circuits, producing brief 3–6 Hz spike–wave bursts (covanis2015jeavonssyndrome–updatedreview pages 7-8). 4) Clinical eyelid myoclonia with behavioral arrest (absence) manifests; IPS can provoke similar paroxysms even with eyes open (covanis2015jeavonssyndrome–updatedreview pages 2-4). 5) In some, generalized tonic–clonic seizures occur; photosensitivity contributes to self-induction behaviors (covanis2015jeavonssyndrome–updatedreview pages 7-8).
Staging/phases: Childhood onset (2–14 years; peak 6–8), persistent photosensitivity, with variable persistence or remission; female predominance (tuac2017jeavonssyndrome12 pages 1-2).

6. Phenotypic Manifestations

Key clinical phenotypes and HP terms:
Eyelid myoclonia (HP:0001265) and absence seizures (HP:0002121) temporally linked to eye closure and light (covanis2015jeavonssyndrome–updatedreview pages 1-2, covanis2015jeavonssyndrome–updatedreview pages 7-8).
Photosensitivity (HP:0007460) with photoparoxysmal response to IPS; lack of response in darkness (covanis2015jeavonssyndrome–updatedreview pages 7-8).
Eye-closure–induced epileptiform discharges (HP:0032393 analog; provoked within ≈0.5–4 s after eye closure) (vaudano2014thevisualsystem pages 1-2, covanis2015jeavonssyndrome–updatedreview pages 7-8).
Generalized 3–6 Hz spike–wave discharges (HP:0002353) often with frontal predominance during events (he2025casereporta pages 3-7, covanis2015jeavonssyndrome–updatedreview pages 1-2).
Female predominance and childhood onset (HP:0003674 for onset in first decade) (tuac2017jeavonssyndrome12 pages 1-2).

Expert opinions and authoritative analysis

Covanis emphasizes three necessary factors for clinical expression: “genetic predisposition,” “voluntary or on-command slow eye closure,” and “light input (photosensitivity/IPS)” (covanis2015jeavonssyndrome–updatedreview pages 2-4). The occipital cortex is “of crucial importance” in photosensitive epilepsies, with generalized spread via a “subcortical circuit” (covanis2015jeavonssyndrome–updatedreview pages 7-8).
Vaudano et al. interpret fMRI/EEG data as demonstrating altered anatomo-functional properties of the visual system in EMA, with increased visual cortex/pulvinar responses and decreased frontal eye field gray matter, implicating visual–thalamo–FEF networks in pathophysiology (vaudano2014thevisualsystem pages 1-2).
Genetic reviews highlight heterogeneity: “no single definitive causative gene,” but convergent synaptic/neurodevelopmental pathways (SYNGAP1, NEXMIF, RORB, CHD2) may modify excitability of visual–thalamo-cortical networks (mayo2021candidategenesfor pages 1-2, mayo2021candidategenesfor pages 26-27).

Statistics and data from recent studies

Epidemiology: EMA accounts for approximately 7–13% of idiopathic generalized epilepsies with absences; childhood onset (2–14 years; often 6–8), female predominance; blinking/eye closure more potent triggers than IPS in one series (tuac2017jeavonssyndrome12 pages 1-2).
Temporal dynamics: Eye-closure–induced EEG paroxysms occur within 0.5–4 s of closing eyes and are absent in total darkness (vaudano2014thevisualsystem pages 1-2, covanis2015jeavonssyndrome–updatedreview pages 7-8).

Gene/protein annotations (ontology-ready)

SYNGAP1 (HGNC:11494): GO:0007268 (chemical synaptic transmission), GO:0099578 (NMDA receptor signaling), GO:0014069 (postsynaptic density); implicated in EMA (mayo2021candidategenesfor pages 1-2, mayo2021candidategenesfor pages 26-27).
NEXMIF (HGNC:28907): GO:0007417 (central nervous system development), GO:0050808 (synapse organization) inferred from role in neurodevelopment; EMA-like phenotypes (mayo2021candidategenesfor pages 26-27).
RORB (HGNC:10260): GO:0006355 (regulation of transcription, DNA-templated), GO:0022008 (neurogenesis); EMA cases reported (mayo2021candidategenesfor pages 1-2).
CHD2 (HGNC:2018): GO:0006338 (chromatin remodeling); EMA cases reported (mayo2021candidategenesfor pages 26-27).
SLC2A1 (HGNC:11005): GO:0005355 (glucose transmembrane transporter activity), GO:0006006 (glucose metabolic process); rare EMA (mayo2021candidategenesfor pages 26-27).
KCNB1 (HGNC:6239): GO:0005267 (potassium channel activity), GO:0006813 (potassium ion transport); rare EMA-like (mayo2021candidategenesfor pages 26-27).
NAA10 (HGNC:13354): GO:0006474 (N-terminal protein amino acid acetylation); rare EMA-like (mayo2021candidategenesfor pages 26-27).
CSNK2B (HGNC:2456): GO:0006468 (protein phosphorylation), GO:0060070 (Wnt signaling pathway) per case discussion; proposed EMA candidate (he2025casereporta pages 3-7).

Cell type involvement (CL)

Cortical pyramidal neurons (CL:0000624) in occipital cortex; thalamic relay neurons in pulvinar (CL:0000700); cortical inhibitory interneurons (CL:0000099) are likely modulators of oscillatory balance though direct evidence in JS is not presented here (vaudano2014thevisualsystem pages 1-2, mayo2021candidategenesfor pages 1-2).

Anatomical locations (UBERON)

Primary/associative visual cortices (UBERON:0002436, UBERON:0000956); pulvinar/posterior thalamus (UBERON:0001896); frontal eye fields (UBERON:0006479) (vaudano2014thevisualsystem pages 1-2).

Chemical entities (CHEBI)

Valproic acid (CHEBI:39867) commonly used in clinical practice for generalized epilepsies; “most preferred” agent in small JS series (tuac2017jeavonssyndrome12 pages 1-2).

Evidence items with PMIDs/DOIs and URLs

Covanis A. Jeavons syndrome–updated review. 2015. DOI: 10.21307/joepi-2015-0033; URL: https://doi.org/10.21307/joepi-2015-0033 (covanis2015jeavonssyndrome–updatedreview pages 1-2, covanis2015jeavonssyndrome–updatedreview pages 2-4, covanis2015jeavonssyndrome–updatedreview pages 7-8).
Vaudano AE et al. The visual system in eyelid myoclonia with absences. Ann Neurol. 2014;76:412–427. DOI: 10.1002/ana.24236; URL: https://doi.org/10.1002/ana.24236 (vaudano2014thevisualsystem pages 1-2).
Tuaç ST et al. Jeavons Syndrome: 12 Cases. 2017. DOI: 10.14744/epilepsi.2016.88319; URL: https://doi.org/10.14744/epilepsi.2016.88319 (tuac2017jeavonssyndrome12 pages 1-2).
Mayo S et al. Candidate Genes for Eyelid Myoclonia with Absences, Review of the Literature. Int J Mol Sci. 2021;22:5609. DOI: 10.3390/ijms22115609; URL: https://doi.org/10.3390/ijms22115609 (mayo2021candidategenesfor pages 1-2, mayo2021candidategenesfor pages 26-27).
He Y et al. Case Report: CSNK2B variant with primary eyelid myoclonia. Front Pediatr. 2025. DOI: 10.3389/fped.2025.1583346; URL: https://doi.org/10.3389/fped.2025.1583346 (he2025casereporta pages 3-7).

Notes on recency and limitations

This report prioritizes high-quality mechanistic sources; however, within the accessible evidence set, most detailed pathophysiological data derive from 2014–2017 studies and a 2021 genetic review. A 2025 single case is included for CSNK2B as a candidate. More recent 2023–2024 consensus and EEG/clinical analyses exist but were not available in the gathered context; thus, some sections are necessarily partial with respect to the latest consensus statements.

References

(covanis2015jeavonssyndrome–updatedreview pages 1-2): A Covanis. Jeavons syndrome–updated review. Unknown journal, 2015. URL: https://doi.org/10.21307/joepi-2015-0033, doi:10.21307/joepi-2015-0033.
(covanis2015jeavonssyndrome–updatedreview pages 7-8): A Covanis. Jeavons syndrome–updated review. Unknown journal, 2015. URL: https://doi.org/10.21307/joepi-2015-0033, doi:10.21307/joepi-2015-0033.
(vaudano2014thevisualsystem pages 1-2): Anna Elisabetta Vaudano, Andrea Ruggieri, Manuela Tondelli, Pietro Avanzini, Francesca Benuzzi, Giuliana Gessaroli, Gaetano Cantalupo, Massimo Mastrangelo, Aglaia Vignoli, Carlo Di Bonaventura, Maria Paola Canevini, Bernardo Dalla Bernardina, Paolo Frigio Nichelli, and Stefano Meletti. The visual system in eyelid myoclonia with absences. Annals of Neurology, 76:412-427, Sep 2014. URL: https://doi.org/10.1002/ana.24236, doi:10.1002/ana.24236. This article has 84 citations and is from a highest quality peer-reviewed journal.
(covanis2015jeavonssyndrome–updatedreview pages 2-4): A Covanis. Jeavons syndrome–updated review. Unknown journal, 2015. URL: https://doi.org/10.21307/joepi-2015-0033, doi:10.21307/joepi-2015-0033.
(mayo2021candidategenesfor pages 1-2): Sonia Mayo, Irene Gómez-Manjón, Fco. Javier Fernández-Martínez, Ana Camacho, Francisco Martínez, and Julián Benito-León. Candidate genes for eyelid myoclonia with absences, review of the literature. International Journal of Molecular Sciences, 22:5609, May 2021. URL: https://doi.org/10.3390/ijms22115609, doi:10.3390/ijms22115609. This article has 25 citations and is from a poor quality or predatory journal.
(mayo2021candidategenesfor pages 26-27): Sonia Mayo, Irene Gómez-Manjón, Fco. Javier Fernández-Martínez, Ana Camacho, Francisco Martínez, and Julián Benito-León. Candidate genes for eyelid myoclonia with absences, review of the literature. International Journal of Molecular Sciences, 22:5609, May 2021. URL: https://doi.org/10.3390/ijms22115609, doi:10.3390/ijms22115609. This article has 25 citations and is from a poor quality or predatory journal.
(he2025casereporta pages 3-7): Yuanyuan He, Qingqing Deng, Chen Chen, Zhanli Liu, and Lingwei Weng. Case report: a case of poirier–bienvenu neurodevelopmental syndrome manifesting primarily as eyelid myoclonia. Frontiers in Pediatrics, Sep 2025. URL: https://doi.org/10.3389/fped.2025.1583346, doi:10.3389/fped.2025.1583346. This article has 0 citations and is from a poor quality or predatory journal.
(tuac2017jeavonssyndrome12 pages 1-2): ST TUAÇ, C Yalcinkaya, and AV Demirbilek. Jeavons syndrome: 12 cases. Journal of the Turkish Epilepsi Society, 2017. URL: https://doi.org/10.14744/epilepsi.2016.88319, doi:10.14744/epilepsi.2016.88319. This article has 5 citations.

Jeavons Syndrome

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References

Deep Research

Disorder

Key Pathophysiology Nodes

Citation Inventory (for evidence mapping)

Pathophysiology description (current understanding)

1. Core Pathophysiology

2. Key Molecular Players

3. Biological Processes (GO terms; disrupted)

4. Cellular Components (GO:CC)

5. Disease Progression

6. Phenotypic Manifestations

Expert opinions and authoritative analysis

Statistics and data from recent studies

Gene/protein annotations (ontology-ready)

Cell type involvement (CL)

Anatomical locations (UBERON)

Chemical entities (CHEBI)

Evidence items with PMIDs/DOIs and URLs

Notes on recency and limitations