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Related Concept Videos

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...
Karyotyping01:17

Karyotyping

Describing the number and physical features of chromosomes can reveal abnormalities that underlie genetic diseases. This description is facilitated by special staining techniques that produce a particular banding pattern on each chromosome. State-of-the-art techniques make this approach even more powerful, enabling the detection of individual genes that cause disease.A Simple Chromosome Staining Technique Provides Valuable Scientific InsightSome genetic diseases can be detected by looking at...
Karyotyping01:17

Karyotyping

Describing the number and physical features of chromosomes can reveal abnormalities that underlie genetic diseases. This description is facilitated by special staining techniques that produce a particular banding pattern on each chromosome. State-of-the-art techniques make this approach even more powerful, enabling the detection of individual genes that cause disease.A Simple Chromosome Staining Technique Provides Valuable Scientific InsightSome genetic diseases can be detected by looking at...
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.
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:
Seizures l: Introduction01:20

Seizures l: Introduction

Understanding seizures and epilepsy relies on key definitions that help in recognizing, classifying, and managing these disorders. These definitions provide a framework for recognizing, classifying, and managing seizure disorders.DefinitionsA seizure is a sudden, abnormal burst of electrical activity in the brain that can cause changes in awareness, movement, sensation, or behavior, depending on the area involved. Epilepsy is a chronic condition characterized by recurrent, unprovoked seizures,...

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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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Epilepsy and the new cytogenetics.

John C Mulley1, Heather C Mefford

  • 1Department of Genetic Medicine, Directorate of Genetics and Molecular Pathology, SA Pathology at Women's and Children's Hospital, Adelaide, South Australia, Australia. john.mulley@health.sa.gov.au

Epilepsia
|January 29, 2011
PubMed
Summary

Molecular karyotyping methods like array comparative genome hybridization (array CGH) are increasingly used for epilepsy diagnosis. Copy number variants (CNVs) are significant in epilepsy susceptibility, impacting genetic counseling for complex cases.

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Area of Science:

  • Genetics and Genomics
  • Neurology
  • Molecular Biology

Background:

  • Conventional cytogenetics has limitations in diagnosing epilepsy, particularly for subtle genetic variations.
  • Molecular karyotyping techniques offer higher resolution for detecting microchromosomal variations.
  • Epilepsy genetics is complex, involving copy number variants (CNVs) and their variable expressivity.

Purpose of the Study:

  • To review the shift from conventional cytogenetics to molecular karyotyping in epilepsy applications.
  • To highlight the role of array comparative genome hybridization (array CGH) in characterizing epilepsy-associated lesions.
  • To discuss the impact of CNVs on epilepsy susceptibility and genetic counseling.

Main Methods:

  • Review of multiplex ligase-dependent probe amplification (MLPA) for targeted gene analysis (e.g., SCN1A, KCNQ2).
  • Established use of oligonucleotide array comparative genome hybridization (array CGH) for genome-wide CNV detection.
  • Analysis of recurrent microdeletions at specific genomic loci (15q13.3, 16p13.11, 15q11.2) associated with epilepsy.

Main Results:

  • Molecular karyotyping, especially array CGH, is now standard for exploring microchromosomal variations in epilepsy.
  • CNVs are implicated in both sporadic and familial epilepsy, particularly in cases with atypical presentations.
  • Recurrent microdeletions at 15q13.3, 16p13.11, and 15q11.2 are common in generalized epilepsy and linked to other neurodevelopmental disorders.

Conclusions:

  • Molecular karyotyping has largely replaced conventional cytogenetics for comprehensive epilepsy evaluation.
  • CNVs significantly contribute to epilepsy susceptibility, with implications for genetic counseling due to incomplete penetrance and variable expressivity.
  • Understanding CNVs, including those in segmental duplication 'hotspots', is crucial for unraveling the complex genetics of epilepsy and its comorbidities.