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Related Concept Videos

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.
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...
Seizures: Classification01:13

Seizures: Classification

Epilepsy is primarily characterized by unpredictable seizures, either provoked by an identifiable factor, such as injury or illness, or unprovoked, occurring spontaneously without apparent cause.
Seizures are typically classified into two main categories: focal and generalized seizures.
Focal Seizures
Focal seizures originate from specific regions of the brain. These seizures are further sub-classified into two types:
Sex-linked Disorders01:43

Sex-linked Disorders

Like autosomes, sex chromosomes contain a variety of genes necessary for normal body function. When a mutation in one of these genes results in biological deficits, the disorder is considered sex-linked.
Inborn Errors of Metabolism01:20

Inborn Errors of Metabolism

Phenylketonuria (PKU) is a protein metabolism disorder characterized by high blood levels of the amino acid phenylalanine. This results from a mutation in the gene responsible for phenylalanine hydroxylase, an enzyme that converts phenylalanine into tyrosine. When this enzyme is deficient, phenylalanine builds up in the blood, leading to symptoms such as vomiting, rashes, seizures, growth deficiency, and severe mental retardation. An early diagnosis and a diet restricting phenylalanine intake...
Genomic Imprinting and Inheritance02:30

Genomic Imprinting and Inheritance

Diploid organisms inherit genetic material through chromosomes from both parents. Copies of the same gene are known as alleles. In most cases, both alleles are simultaneously expressed and allow various cellular processes to function optimally. If one of the alleles is missing or mutated, the expression of the other allele can compensate; however, this is not true for all genes.
The expression of some genes depends on which parent passed the gene to the offspring, through a phenomenon known as...

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Related Experiment Video

Updated: May 19, 2026

Identification and Classification of Position-specific GABAA Receptor Subunit Missense Variants for Their Role In Hippocampal Pyramidal Neurons
08:04

Identification and Classification of Position-specific GABAA Receptor Subunit Missense Variants for Their Role In Hippocampal Pyramidal Neurons

Published on: June 6, 2025

Complex single gene disorders and epilepsy.

Aine Merwick1, Margaret O'Brien, Norman Delanty

  • 1Epilepsy Programme, Department of Neurology, Beaumont Hospital and Royal College of Surgeons in Ireland, Dublin, Ireland.

Epilepsia
|September 6, 2012
PubMed
Summary
This summary is machine-generated.

Genetic research is advancing our understanding of epilepsy, a complex disorder often linked to intellectual disability. Advances in genetic sequencing are identifying specific gene mutations responsible for various epilepsy syndromes, improving diagnosis and treatment.

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A Novel Strategy Combining Array-CGH, Whole-exome Sequencing and In Utero Electroporation in Rodents to Identify Causative Genes for Brain Malformations
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A Novel Strategy Combining Array-CGH, Whole-exome Sequencing and In Utero Electroporation in Rodents to Identify Causative Genes for Brain Malformations

Published on: December 1, 2017

Behavioral And Physiological Analysis In A Zebrafish Model Of Epilepsy
08:26

Behavioral And Physiological Analysis In A Zebrafish Model Of Epilepsy

Published on: October 19, 2021

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Last Updated: May 19, 2026

Identification and Classification of Position-specific GABAA Receptor Subunit Missense Variants for Their Role In Hippocampal Pyramidal Neurons
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Identification and Classification of Position-specific GABAA Receptor Subunit Missense Variants for Their Role In Hippocampal Pyramidal Neurons

Published on: June 6, 2025

A Novel Strategy Combining Array-CGH, Whole-exome Sequencing and In Utero Electroporation in Rodents to Identify Causative Genes for Brain Malformations
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A Novel Strategy Combining Array-CGH, Whole-exome Sequencing and In Utero Electroporation in Rodents to Identify Causative Genes for Brain Malformations

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Behavioral And Physiological Analysis In A Zebrafish Model Of Epilepsy
08:26

Behavioral And Physiological Analysis In A Zebrafish Model Of Epilepsy

Published on: October 19, 2021

Area of Science:

  • Neurology
  • Genetics
  • Medical Science

Background:

  • Epilepsy is a complex neurological disorder with diverse causes and significant comorbidities like intellectual disability.
  • The genetic basis of many epilepsy types remains incompletely understood.
  • Advancements in genetic technologies, including whole exome and whole genome sequencing, are rapidly improving our ability to identify genetic causes.

Purpose of the Study:

  • To review well-characterized complex epilepsies associated with single gene disorders.
  • To highlight the importance of genetic testing in diagnosing epilepsy and understanding phenotype-genotype correlations.
  • To discuss recent advances in identifying genetic underpinnings of epilepsy.

Main Methods:

  • Literature review of complex epilepsies with known single gene associations.
  • Discussion of specific genetic disorders including tuberous sclerosis complex, Rett syndrome, progressive myoclonic epilepsies, and PCDH19 gene mutations.
  • Analysis of the role of genetic technology in epilepsy research.

Main Results:

  • Several complex epilepsy syndromes are linked to specific single gene mutations.
  • Examples include tuberous sclerosis complex, Rett syndrome, progressive myoclonic epilepsies, and epilepsy associated with PCDH19 mutations.
  • Understanding these genetic links is crucial for diagnosis and comprehending disease variability.

Conclusions:

  • Genetic factors play a significant role in various epilepsy syndromes.
  • Improved genetic sequencing technologies are crucial for advancing epilepsy research and diagnosis.
  • Identifying specific gene mutations aids in understanding epilepsy's complex phenotype-genotype correlations and guides genetic testing.