Decoupling metabolic defense: Mutational and recombinational chaos in Sod1-deficient cells.

Loss of Sod1 in yeast causes a 48-fold increase in aneuploidy and widespread genomic instability, which is prevented under anaerobic conditions.

• Why it matters: Understanding Sod1's role in genome integrity is crucial because its deficiency leads to severe genetic mutations linked to diseases like ALS, yet its broader protective functions are not fully known.
• What they did: Using whole-genome sequencing in a yeast model, the study examined the effects of Sod1 deficiency, revealing specific mutational signatures and the impact of reactive oxygen species on genome stability.
• The result: Findings show Sod1 deficiency causes extensive mutations, especially C:G to A:T transversions, and that certain ALS-associated Sod1 variants, like H48Q, severely compromise genome integrity, informing disease mechanisms.