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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...
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Related Experiment Video

Updated: Jun 9, 2025

Real-Time Fluorescent Measurement of Synaptic Functions in Models of Amyotrophic Lateral Sclerosis
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Amyotrophic lateral sclerosis established as a multistep process across phenotypes.

Laura Ziser1, Ruben P A van Eijk2,3, Matthew C Kiernan4

  • 1Institute for Molecular Bioscience, University of Queensland, Brisbane, Queensland, Australia.

European Journal of Neurology
|October 30, 2024
PubMed
Summary

Amyotrophic lateral sclerosis (ALS) involves a multistep disease process. The number of steps to ALS onset varies significantly across different clinical presentations, suggesting distinct underlying mechanisms for each phenotype.

Keywords:
amyotrophic lateral sclerosisincidencemultistep process

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Area of Science:

  • Neuroscience
  • Epidemiology
  • Genetics

Background:

  • Amyotrophic lateral sclerosis (ALS) is understood to have a complex, multistep disease causation process.
  • Understanding the number of steps to disease onset is crucial for elucidating pathophysiological mechanisms.

Purpose of the Study:

  • To determine the number of steps required for disease onset across various amyotrophic lateral sclerosis (ALS) phenotypes.

Main Methods:

  • Prospective data collection from the Australian Motor Neurone Disease Registry (2005-2016).
  • Calculation of age-specific incidence rates and application of Poisson regression to analyze the relationship between log incidence and log age of onset.
  • Assessment of model fit using McFadden's R².

Main Results:

  • A total of 2647 ALS patients were analyzed, with a mean age of onset of 62.2 years.
  • A linear relationship between log incidence and log age was observed across all ALS phenotypes, with significant variations in slope estimates (e.g., bulbar: 5.1, cervical: 2.7).
  • Slope estimates were notably higher for the bulbar phenotype compared to cervical, lumbar, and primary lateral sclerosis phenotypes, indicating a different number of steps to disease onset.

Conclusions:

  • The study confirms a multistep disease process for all ALS phenotypes.
  • Variable slope estimates suggest that the number of steps to develop ALS differs based on clinical presentation.
  • Further research into the mechanisms driving these slope estimate variations could offer significant pathophysiological insights.