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Related Concept Videos

Narcolepsy01:07

Narcolepsy

822
Narcolepsy is a chronic sleep disorder characterized by pervasive, uncontrolled sleepiness and other sleep disturbances. One of its hallmark symptoms is an abrupt transition to REM sleep upon falling asleep, which causes symptoms typically associated with this phase to occur unexpectedly during wakefulness. These include the following symptoms, which typically last from a minute or two to half an hour.
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Sleep-Wake Cycles01:24

Sleep-Wake Cycles

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Sleep is an essential physiological process vital to maintaining overall well-being. The reticular activating system (RAS), a network of neurons in the brainstem, regulates wakefulness and sleep. While it may seem passive, sleep consists of distinct cycles, each with its unique characteristics and functions. Two key sleep phases are non-rapid eye movement (NREM) and  rapid eye movement (REM).
NREM Sleep
NREM sleep comprises four progressive stages that seamlessly merge:
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Antiepileptic Drugs: Potassium Channel Activators01:20

Antiepileptic Drugs: Potassium Channel Activators

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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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Epilepsy ll: Types01:22

Epilepsy ll: Types

1
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.
1
Neural Regulation01:37

Neural Regulation

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Digestion begins with a cephalic phase that prepares the digestive system to receive food. When our brain processes visual or olfactory information about food, it triggers impulses in the cranial nerves innervating the salivary glands and stomach to prepare for food.
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Related Experiment Video

Updated: Apr 17, 2026

Manipulation of Epileptiform Electrocorticograms ECoGs and Sleep in Rats and Mice by Acupuncture
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EIF3G is associated with narcolepsy across ethnicities.

Anja Holm1,2, Ling Lin3, Juliette Faraco3

  • 1Molecular Sleep Laboratory, Department of Diagnostics, Glostrup University Hospital, Glostrup, Denmark.

European Journal of Human Genetics : EJHG
|February 12, 2015
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Genetic variations in the EIF3G gene are linked to narcolepsy risk, suggesting shared regulatory pathways may influence this autoimmune disease affecting hypocretin neurons.

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Area of Science:

  • Neuroimmunology
  • Genetics
  • Molecular Biology

Background:

  • Type 1 narcolepsy is an autoimmune disorder impacting hypocretin (orexin) neurons, strongly linked to HLA-DQB1*06:02.
  • A known risk factor is the P2RY11 gene polymorphism rs2305795, located near other genes including DNMT1, which causes a rare form of narcolepsy when mutated.

Purpose of the Study:

  • To investigate if the narcolepsy association with P2RY11 is secondary to linkage disequilibrium with DNMT1.
  • To identify novel genetic associations within the narcolepsy risk locus.

Main Methods:

  • Genome-wide association study (GWAS) analysis across European and Chinese cohorts.
  • Transethnic mapping to pinpoint specific genetic associations.
  • Analysis of gene expression and correlation with narcolepsy-associated polymorphisms.

Main Results:

  • The narcolepsy association signal diminished significantly between P2RY11/EIF3G and DNMT1, indicating the association does not extend to DNMT1.
  • A novel narcolepsy-associated single-nucleotide polymorphism, rs3826784, was identified in the EIF3G gene.
  • The risk allele for rs3826784 increases EIF3G mRNA expression, which correlates with PPAN and P2RY11 expression.

Conclusions:

  • The narcolepsy association in this region is unlikely due to DNMT1, but rather implicates EIF3G.
  • A novel EIF3G polymorphism associated with narcolepsy suggests altered gene expression contributes to the disease.
  • Shared regulatory mechanisms involving EIF3G, PPAN, and P2RY11 may be critical in narcolepsy pathogenesis.