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Stratifying ALS Patients by Mode of Inheritance Reveals Transcriptomic Signatures Specific to sALS and fALS.

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Sporadic amyotrophic lateral sclerosis (sALS) shows distinct molecular differences from familial ALS (fALS), particularly in mitochondrial function and immune response pathways. Understanding these transcriptomic signatures is key for developing targeted ALS therapies.

Keywords:
ALSDESeq2GOGWASWGCNAfALSneurodegenerationsALS

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Area of Science:

  • Neuroscience
  • Genetics
  • Molecular Biology

Background:

  • Amyotrophic lateral sclerosis (ALS) presents significant clinical and molecular heterogeneity.
  • The underlying biology of sporadic ALS (sALS), comprising ~90% of cases, remains poorly understood compared to familial ALS (fALS).

Purpose of the Study:

  • To identify distinct transcriptomic signatures and biological pathways in sporadic ALS (sALS) versus familial ALS (fALS).
  • To investigate the molecular differences between sALS, fALS, and control groups using post-mortem tissue samples.

Main Methods:

  • Analysis of bulk mRNA sequencing data from 247 post-mortem spinal cord and motor cortex samples.
  • Differential gene expression analysis (DESeq2) and weighted gene co-expression network analysis (WGCNA).
  • Gene ontology analysis to identify unique transcriptomic signatures and pathways.

Main Results:

  • sALS samples showed downregulated mitochondrial complex I subunits and regulatory genes in the spinal cord, indicating reduced metabolic resilience.
  • A distinct pattern of immune response gene expression was observed: downregulated in sALS and upregulated in fALS motor cortex samples.
  • Findings suggest unique transcriptomic signatures differentiating sALS and fALS, despite shared disease characteristics.

Conclusions:

  • Sporadic ALS and familial ALS, while largely the same disease, exhibit distinct transcriptomic profiles.
  • Accounting for the mode of inheritance (sALS vs. fALS) is crucial for future ALS research and therapeutic development.
  • Identifying these molecular differences can pave the way for more targeted and effective ALS treatment strategies.