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ALS-associated genes in SCA2 mouse spinal cord transcriptomes.

Daniel R Scoles1, Warunee Dansithong1, Lance T Pflieger1,2

  • 1Department of Neurology, University of Utah, 175 North Medical Drive East, 5th Floor, Salt Lake City, UT 84132, USA.

Human Molecular Genetics
|April 21, 2020
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Summary
This summary is machine-generated.

The ATXN2 gene is crucial in spinocerebellar ataxia type 2 (SCA2) and amyotrophic lateral sclerosis (ALS). Lowering ATXN2 expression in SCA2 mice impacts motor neuron pathways, confirming ATXN2 as a therapeutic target for ALS.

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Area of Science:

  • Neuroscience
  • Genetics
  • Molecular Biology

Background:

  • The ATXN2 gene is implicated in spinocerebellar ataxia type 2 (SCA2) and amyotrophic lateral sclerosis (ALS) pathogenesis.
  • Expanded CAG repeats in ATXN2 are linked to increased ALS risk and motor neuron disease in SCA2 patients.
  • Reducing ATXN2 expression shows therapeutic potential in mouse models of ALS.

Purpose of the Study:

  • To investigate the role of ATXN2 in motor neuron dysfunction in vivo.
  • To compare spinal cord transcriptomes of SCA2 mice with those of other ALS models and patients.
  • To explore the effects of ATXN2-lowering antisense oligonucleotide (ASO) treatment in SCA2 mice.

Main Methods:

  • Utilized an SCA2 bacterial artificial chromosome mouse model with polyglutamine-expanded ATXN2.
  • Performed spinal cord and cerebellar transcriptome analysis.
  • Applied weighted gene co-expression network analysis to identify key pathways.
  • Assessed gene expression changes after ATXN2 ASO treatment.

Main Results:

  • Identified three interconnected pathways (innate immunity, fatty acid, and cholesterol biosynthesis) dysregulated in SCA2 spinal cords.
  • Found significant overlap in differentially expressed genes between spinal cord and cerebellum.
  • Observed that ATXN2 ASO treatment modulated innate immunity, complement, and lysosome/phagosome pathways.
  • Demonstrated shared molecular pathways between SCA2, TDP-43, and SOD1 ALS models.

Conclusions:

  • Provides novel insights into the molecular mechanisms underlying SCA2 spinal cord phenotypes.
  • Highlights the conserved role of ATXN2 in motor neuron degeneration across different ALS subtypes.
  • Confirms ATXN2 as a promising therapeutic target for ALS treatment.