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Phenotypic Characterization of ALS-Causing SOD1 Mutations Affecting Polypeptide Length.

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Amyotrophic lateral sclerosis (ALS) linked to SOD1 gene mutations shows varied clinical outcomes. Understanding these genetic factors is crucial for developing targeted SOD1-directed therapies and patient selection for clinical trials.

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Area of Science:

  • Genetics
  • Neurology
  • Molecular Biology

Background:

  • Over 234 mutations in the *SOD1* gene are linked to amyotrophic lateral sclerosis (ALS), but pathogenic mechanisms, especially those altering polypeptide length, remain debated.
  • The clinical relevance of all reported nonsense *SOD1* mutations in causing ALS is not fully established.
  • Developing targeted anti-SOD1 therapies necessitates a deeper understanding of the clinical-genetic landscape of ALS for patient stratification in trials and clinical practice.

Purpose of the Study:

  • To comprehensively analyze the clinical phenotypes of ALS patients with *SOD1* mutations that alter polypeptide length.
  • To specifically investigate the impact of these mutations on age at symptom onset and patient survival duration.
  • To compare clinical outcomes between frameshift and nonframeshift *SOD1* variants.

Main Methods:

  • Data compilation from web databases, published literature, conference abstracts, and personal communications up to November 2023.
  • Survival analysis of clinical endpoints, including age at symptom onset and age at death.
  • Comparative analysis of frameshift versus nonframeshift *SOD1* variants.

Main Results:

  • Analysis of 146 ALS patients with 38 distinct nonmissense *SOD1* variants revealed a mean age of onset of 46.9 years and mean survival of 49 months.
  • Significant heterogeneity in clinical outcomes was observed, with certain mutations correlating with earlier onset and reduced survival.
  • Frameshift mutations located proximally to the N-terminus were associated with a higher risk of early ALS onset compared to distal mutations.

Conclusions:

  • The clinical presentation of ALS in patients with nonmissense *SOD1* mutations is highly variable and mutation-specific.
  • Diverse *SOD1* mutation carriers should be included in therapeutic trials to ensure broad efficacy.
  • Findings suggest that both loss-of-function and gain-of-function mechanisms may underlie ALS pathogenesis in these patients.