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Related Concept Videos

Epilepsy and Seizures: Overview01:24

Epilepsy and Seizures: Overview

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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...
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Seizures: Classification01:13

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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:
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Antiepileptic Drugs: GABAergic Pathway Potentiators01:18

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γ-aminobutyric acid or GABA, plays a pivotal role as an inhibitory neurotransmitter in the brain. GABA pathway potentiators, also known as GABAergic drugs, are a class of pharmaceutical agents designed to enhance the functioning of the GABAergic system. These medications primarily treat epilepsy, a neurological disorder characterized by recurrent seizures.
The key GABA pathway potentiators used in epilepsy management are as follows.
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Inborn Errors of Metabolism01:20

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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...
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Genomic Imprinting and Inheritance02:30

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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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Antiepileptic Drugs: Potassium Channel Activators01:20

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Ezocgabine or retigabine, an antiepileptic drug of remarkable efficacy, has revolutionized the management of seizures. It is a potassium channel activator, explicitly targeting the family of Q subtype potassium channels. It enhances the transmembrane potassium currents, regulating neuronal excitability. This action stabilizes the resting membrane potential, a pivotal factor in mitigating the hyperexcitability that characterizes epilepsy.
Ezogabine has gained approval as an adjunctive treatment...
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Inherited Developmental and Epileptic Encephalopathies.

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Genetic factors cause many epileptic encephalopathies. Understanding the phenotype spectrum of inherited syndromes aids in diagnosing these neurodevelopmental disorders, improving patient outcomes.

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Area of Science:

  • Neuroscience
  • Genetics
  • Developmental Biology

Background:

  • Epileptic encephalopathies frequently stem from genetic causes.
  • Epileptic activity can worsen neurodevelopmental impairments, a condition known as developmental and epileptic encephalopathy.
  • This review focuses on inherited epileptic syndromes.

Purpose of the Study:

  • To review inherited epileptic encephalopathies.
  • To discuss the phenotypes of genetic disorders impacting neurodevelopment.
  • To highlight diagnostic red flags for specific gene families.

Main Methods:

  • Literature review of genetic disorders causing epileptic encephalopathies.
  • Analysis of phenotypic presentations associated with genetic mutations.
  • Identification of clinical indicators for specific genetic etiologies.

Main Results:

  • Phenotypes associated with genetic disorders affecting ion channels, metabolic signaling, membrane trafficking, exocytosis, cell adhesion, and cell growth are discussed.
  • Key clinical features that suggest particular gene families or specific genes are identified.
  • The broad phenotypical spectrum of these disorders is elucidated.

Conclusions:

  • Recognizing the phenotypical spectrum is crucial for suspecting specific genetic causes of epileptic encephalopathies.
  • Prompt diagnosis based on phenotype can expedite genetic testing and intervention.
  • Understanding genetic etiologies improves the management of developmental and epileptic encephalopathies.