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Related Concept Videos

Alzheimer Disease ll: Pathophysiology01:23

Alzheimer Disease ll: Pathophysiology

Alzheimer disease involves structural changes in the brain that begin long before symptoms appear. The most distinctive features are extracellular neuritic plaques and intracellular neurofibrillary tangles.Neuritic plaques form in the cerebral cortex and around blood vessels. These plaques contain a dense core of beta-amyloid (Aβ)—a toxic protein fragment that clumps outside neurons. The core is surrounded by damaged neuronal extensions, as well as reactive astrocytes and microglia. Abnormal...
Parkinson Disease ll: Pathophysiology01:24

Parkinson Disease ll: Pathophysiology

Parkinson disease (PD) is a progressive neurodegenerative disorder primarily affecting movement, with additional non-motor features. Its pathophysiology involves complex interactions among genetic susceptibility, environmental exposures, and cellular dysfunction, including dopaminergic neuron loss, protein aggregation, and mitochondrial impairment.Selective NeurodegenerationA key feature is the degeneration of dopaminergic neurons in the substantia nigra pars compacta, leading to reduced...
Alzheimer Disease l: Introduction01:29

Alzheimer Disease l: Introduction

Alzheimer disease is a chronic, progressive, and irreversible neurodegenerative disorder and the most common cause of dementia in older adults. It leads to gradual neuronal loss, causing cognitive decline, behavioral changes, and loss of functional independence.Risk Factors and EtiologyThe disease is multifactorial. Age is the strongest risk factor, with prevalence doubling every 5 years after age 65. Genetic factors include mutations in genes such as APP, PSEN1, and PSEN2, which are associated...
Parkinson's Disease: Overview01:15

Parkinson's Disease: Overview

Neurodegenerative disorders are progressive diseases that cause irreversible damage and loss to neurons in specific brain areas. Examples of these disorders include Parkinson's disease, Alzheimer's disease, Multiple Sclerosis (MS), and Amyotrophic Lateral Sclerosis (ALS). These disorders share characteristics such as proteinopathies, selective neuronal vulnerability, and a complex interplay between genetic and environmental factors. The primary therapeutic goal for these conditions is to...
Neurogenesis and Regeneration of Nervous Tissue01:15

Neurogenesis and Regeneration of Nervous Tissue

In the CNS, neurogenesis, the birth of new neurons from stem cells, is limited to the hippocampus in adults. In other regions of the brain and spinal cord, neurogenesis is almost non-existent due to inhibitory influences from neuroglia, especially oligodendrocytes, and the absence of growth-stimulating cues. The myelin produced by oligodendrocytes in the CNS inhibits neuronal regeneration. Furthermore, astrocytes proliferate rapidly after neuronal damage, forming scar tissue that physically...
Alzheimer's Disease: Overview01:26

Alzheimer's Disease: Overview

Alzheimer's Disease (AD) is a continually advancing neurodegenerative disorder, distinguished by escalating memory loss, cognitive dysfunction, and dementia. The disease unfolds in three stages: preclinical, mild cognitive impairment (MCI), and dementia. Its onset is insidious, and the progression gradual, with the cause not well explained by other disorders.
The clinical diagnosis of AD hinges on the presence of memory and other cognitive impairments. Biomarkers, such as changes in Aβ and tau...

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Related Experiment Video

Updated: May 18, 2026

Modeling Age-Associated Neurodegenerative Diseases in Caenorhabditis elegans
07:04

Modeling Age-Associated Neurodegenerative Diseases in Caenorhabditis elegans

Published on: August 15, 2020

Evolution of neurodegeneration.

Mark R Cookson1

  • 1Cell Biology and Gene Expression Unit, Laboratory of Neurogenetics, National Institute on Aging, Bethesda, MD 20892-3707, USA. cookson@mail.nih.gov

Current Biology : CB
|September 15, 2012
PubMed
Summary
This summary is machine-generated.

Evolutionary insights can illuminate the genetic basis of age-related neurodegenerative diseases. Understanding the evolutionary shaping of these genes aids in selecting appropriate model systems and analyzing selection pressures.

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Last Updated: May 18, 2026

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Area of Science:

  • Neuroscience
  • Evolutionary Biology
  • Genetics

Background:

  • Neurodegenerative diseases are a significant cause of morbidity in aging human populations.
  • These disorders involve the progressive loss of specific neuron populations across distinct brain regions.
  • While often sporadic, a considerable genetic component underlies many neurodegenerative conditions.

Purpose of the Study:

  • To explore the role of evolutionary processes in shaping genes associated with neurodegeneration.
  • To discuss the implications of evolutionary perspectives for selecting research models.
  • To consider theoretical aspects of evolutionary selection acting on neurodegenerative phenotypes.

Main Methods:

  • Review of existing literature on neurogenetics and evolutionary theory.
  • Analysis of genetic components of neurodegenerative diseases within an evolutionary framework.
  • Discussion of comparative genomics and phylogenetic approaches.

Main Results:

  • Evolutionary pressures may have influenced the genes implicated in neurodegeneration.
  • Understanding evolutionary history can inform the choice of appropriate model organisms for research.
  • The level at which selection acts against neurodegenerative phenotypes is a complex theoretical question.

Conclusions:

  • An evolutionary perspective offers valuable insights into the genetic underpinnings of neurodegenerative diseases.
  • This framework can guide the development of more effective research strategies and therapeutic approaches.
  • Further investigation into the evolutionary dynamics of neurodegeneration is warranted.