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Related Concept Videos

Narcolepsy01:07

Narcolepsy

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.
Sleep-Wake Cycles01:24

Sleep-Wake Cycles

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:
Parkinson Disease l: Introduction01:24

Parkinson Disease l: Introduction

Parkinson’s disease is a chronic, progressive neurodegenerative disorder that primarily affects movement. It is characterized by motor symptoms such as resting tremors, muscle rigidity, bradykinesia (slowness of movement), and postural instability. Patients may notice hand tremors at rest, stiffness during movement, or a shuffling gait. In addition to motor features, non-motor symptoms include sleep disturbances, mood and behavioral changes, constipation, and cognitive impairment, all of which...
Causes of Social Behavior III: Biological and Environmental Influences01:28

Causes of Social Behavior III: Biological and Environmental Influences

Social behavior is a complex phenomenon that arises from the interaction between biological predispositions and environmental influences. This intricate interplay shapes how individuals think, feel, and act in various social contexts. Understanding these mechanisms requires insights from psychology, neuroscience, genetics, and evolutionary theory.Environmental Influences on Social BehaviorEnvironmental factors, including temperature, odors, and visual stimuli, play a crucial role in shaping...
Type I Diabetes I: Introduction01:12

Type I Diabetes I: Introduction

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Disorders of the Nervous Tissue01:28

Disorders of the Nervous Tissue

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Homeostatic Imbalances:
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Updated: Jun 10, 2026

Gene-environment Interaction Models to Unmask Susceptibility Mechanisms in Parkinson's Disease
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Published on: January 7, 2014

Narcolepsy type 1: an environment-influenced disease.

Beatrice Vinceti1, Carlo Fusco2, Duccio Maria Cordelli3

  • 1Department of Medical and Surgical Sciences (DIMEC), Alma Mater Studiorum - University of Bologna, Bologna, Italy; Child Neurology and Psychiatry Unit, AUSL-IRCCS di Reggio Emilia, Reggio Emilia, Italy.

Sleep Medicine
|June 8, 2026
PubMed
Summary
This summary is machine-generated.

Environmental factors contribute to narcolepsy type 1 (NT1), a neurological disorder. Twin and epidemiological studies suggest links to infections, toxins, and gut microbiota, but more research is needed.

Keywords:
CataplexyChildEnvironmental factorsNarcolepsyTwins

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Area of Science:

  • Neurology
  • Immunology
  • Genetics

Background:

  • Narcolepsy type 1 (NT1) is a chronic neurological disorder often starting in childhood.
  • It involves disrupted wake-sleep boundaries, excessive daytime sleepiness, cataplexy, sleep paralysis, and hallucinations.
  • NT1 is thought to arise from genetic predisposition interacting with environmental triggers, causing hypocretin neuron loss.

Purpose of the Study:

  • To review current evidence on the role of environmental factors in narcolepsy type 1 (NT1) etiopathogenesis.
  • To update the understanding of environmental influences on NT1 development.

Main Methods:

  • Literature search of PubMed and Scopus databases up to April 22, 2026.
  • Focused on studies of NT1 concordance in monozygotic twins and environmental risk factors.
  • Retrieved and analyzed relevant publications.

Main Results:

  • Identified disease concordance in 33% (8/24) of monozygotic twin pairs.
  • Discordant twins showed differences in BMI, weight changes, head trauma history, infections, and comorbidities.
  • Potential environmental risk factors include season of birth, H1N1 influenza, vaccination, toxins, and gut microbiota alterations.

Conclusions:

  • Evidence from twin and epidemiological studies supports an environmental role in NT1.
  • Limited studies and methodological issues hinder comprehensive assessment.
  • Further investigation is required to fully understand these etiological factors.