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Related Concept Videos

Principles of Pharmacogenetics: Types of Genetic Variants01:27

Principles of Pharmacogenetics: Types of Genetic Variants

The human genome is over 99.9% identical between individuals, yet genetic differences exist at millions of bases. The human genome contains approximately 3 million variant positions per individual, many of which are heterozygous, contributing to genetic diversity and individual traits. Genetic variations include single-nucleotide polymorphisms (SNPs), insertions, deletions, and copy number variations (CNVs).SNPs, the most common variation, involve single-base changes in DNA. These can be...
Encephalitis ll: Pathophysiology01:26

Encephalitis ll: Pathophysiology

Encephalitis is inflammation of the brain parenchyma caused by direct viral invasion or immune-mediated mechanisms triggered by infections or tumors. Both processes lead to neuronal injury, disrupted neurotransmission, and diverse neurological symptoms, often with overlapping clinical and pathological features.Autoimmune EncephalitisIn autoimmune encephalitis, antibodies target neuronal antigens on cell surfaces, synapses, or within neurons. A key example is anti-NMDAR encephalitis, which can...
Epilepsy and Seizures: Overview01:24

Epilepsy and Seizures: Overview

Epilepsy is a chronic neurological disease marked by recurrent, unpredictable seizures. These seizures are caused by abnormal electrical discharges in the brain, leading to behavior, sensation, or consciousness alterations. They can also cause transient impairment of awareness, interfering with daily activities.
Various factors can trigger epilepsy, including genetic factors, brain damage, metabolic causes, and unknown etiology. Diagnosis of epilepsy involves electroencephalography (EEG), which...
Epilepsy ll: Types01:22

Epilepsy ll: Types

Recurrent seizures, stemming from abnormal electrical activity in the brain, are the defining characteristic of epilepsy, a chronic neurological condition. Because seizure features vary greatly, epilepsy is classified using two systems: by seizure type and by epilepsy syndromes. These classifications enable clinicians to describe seizure patterns and select suitable treatment strategies.I. Classification by Seizure Type1. Focal EpilepsyFocal epilepsy begins in one hemisphere of the brain.
Epistasis Analysis01:09

Epistasis Analysis

Although Mendel chose seven unrelated traits in peas to study gene segregation, most traits involve multiple gene interactions that create a spectrum of phenotypes. When the interaction of various genes or alleles at different locations influences a phenotype, this is called epistasis. Epistasis often involves one gene masking or interfering with the expression of another (antagonistic epistasis). Epistasis often occurs when different genes are part of the same biochemical pathway. The...
Antiepileptic Drugs: Modulators of Neurotransmitter Release Mediated by SV2A Protein01:20

Antiepileptic Drugs: Modulators of Neurotransmitter Release Mediated by SV2A Protein

Antiepileptic drugs, such as levetiracetam (Keppra) and brivaracetam (Briviact), have emerged as crucial tools in managing epilepsy. These medications exert their therapeutic effects by targeting the synaptic vesicle protein SV2A, a transmembrane glycoprotein primarily found in the brain.
SV2A is a transmembrane glycoprotein located predominantly in the brain, modulating the release of neurotransmitters for neuronal communication. Both levetiracetam and brivaracetam exhibit a high affinity for...

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From Pathogenicity to Mechanism: A Variant Interpretation Framework for Monogenic Epilepsy.

Shaopei Ye1, Peng Chen2

  • 1Universitat de Barcelona, Barcelona, Spain.

Clinical Genetics
|July 1, 2026
PubMed
Summary
This summary is machine-generated.

SeizeVar integrates pathogenicity and mechanism to prioritize epilepsy variants of uncertain significance, aiding clinical interpretation. This tool provides a mechanism-annotated list, supporting expert curation and accelerating genetic diagnosis.

Keywords:
monogenic epilepsypharmacogenomicsprotein language modelsodium‐channel blockervariants of uncertain significancevariant‐effect prediction

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Area of Science:

  • Genomics and Bioinformatics
  • Computational Biology
  • Epilepsy Genetics

Background:

  • High accuracy of pathogenicity predictors in ClinVar is limited for monogenic epilepsy variants of uncertain significance (VUS).
  • Current predictors lack direction-of-effect and scalable mechanism-to-treatment mapping, hindering clinical utility.
  • Existing VUS backlogs impede efficient genetic diagnosis and therapeutic development in epilepsy.

Purpose of the Study:

  • To develop SeizeVar, a framework integrating pathogenicity and functional mechanism prediction for epilepsy VUS.
  • To provide a mechanism-annotated prioritization list to support expert variant curation.
  • To establish a community benchmark for reclassification-aware evaluation of VUS.

Main Methods:

  • SeizeVar combines a random forest and ESM-2 LoRA cross-attention pathogenicity head with a gain-versus-loss-of-function mechanism classifier.
  • A deterministic sodium-channel mechanism-direction rule was incorporated.
  • The framework was trained on a 49-gene epilepsy panel and evaluated on multiple held-out cohorts and an external functional cohort.

Main Results:

  • SeizeVar's mechanism head achieved an AUROC of 0.736 with 100% panel coverage, comparable to specialized tools.
  • General pathogenicity predictors showed significantly lower mechanism prediction performance (AUROC ≤ 0.62).
  • Applied to 29,293 epilepsy VUS, SeizeVar identified 4,708 likely pathogenic candidates, with 1,500 sodium-channel variants receiving predicted mechanism-direction labels (679 LoF-leaning, 821 GoF-leaning).

Conclusions:

  • SeizeVar effectively integrates pathogenicity and mechanism prediction, offering a novel approach to VUS prioritization in epilepsy.
  • The tool provides a mechanism-annotated list, enhancing the efficiency and direction of expert variant curation.
  • Prospective clinical validation of SeizeVar predictions is warranted, with the Reclassified-VUS benchmark facilitating future evaluations.