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Related Experiment Video

Updated: Sep 14, 2025

Clinical Testing and Spinal Cord Removal in a Mouse Model for Amyotrophic Lateral Sclerosis ALS
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Clinical Testing and Spinal Cord Removal in a Mouse Model for Amyotrophic Lateral Sclerosis ALS

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Meta-Analysis of Gene Expression in Bulk-Processed Post-Mortem Spinal Cord from ALS Patients and Normal Controls.

William R Swindell1

  • 1Division of Hospital Medicine, Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, TX 75390-9175, USA.

Neurosci
|July 23, 2025
PubMed
Summary

Amyotrophic lateral sclerosis (ALS) involves motor neuron loss. This meta-analysis reveals distinct gene expression changes in spinal cord white matter, linked to oligodendrocyte loss and a specific microglia response.

Keywords:
RNA-seqmicrogliamotor neuron diseaseneuromuscularoligodendrocytespatial transcriptomics

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Last Updated: Sep 14, 2025

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Area of Science:

  • Neuroscience
  • Genomics
  • Pathology

Background:

  • Amyotrophic lateral sclerosis (ALS) is a fatal neurodegenerative disease characterized by progressive upper and lower motor neuron degeneration.
  • Current understanding of ALS pathogenesis is limited, necessitating deeper molecular investigation.

Purpose of the Study:

  • To perform a meta-analysis of gene expression datasets from post-mortem spinal cord tissue of ALS patients and controls.
  • To identify differentially expressed genes (DEGs) and their cellular and regional localization within the spinal cord.

Main Methods:

  • Meta-analysis of 569 bulk-processed spinal cord samples (454 ALS, 115 CTL) from 348 individuals.
  • Identification and characterization of DEGs, including their cell-type specificity and association with biological pathways.
  • Integration with spatial transcriptomics data to pinpoint DEG expression in specific spinal cord regions.

Main Results:

  • Identified 213 DEGs (144 increased, 69 decreased in ALS).
  • ALS-increased DEGs are linked to microglia, immune response (MHC class II), and leukocyte activation.
  • ALS-decreased DEGs are linked to mature oligodendrocytes (myelin production, sterol metabolism).
  • DEGs are predominantly expressed in white matter, particularly ventral/lateral regions.

Conclusions:

  • Spinal cord white matter is significantly impacted by gene expression shifts in ALS.
  • Observed changes are attributed to mature oligodendrocyte attrition and an emergent microglia phenotype.
  • Findings suggest a shared molecular basis for microglia responses across neurodegenerative conditions.