| SOD1 — Superoxide Dismutase 1 | |
|---|---|
| Symbol | SOD1 |
| Full Name | Superoxide Dismutase 1 |
| Chromosome | 21q22.11 |
| NCBI Gene | 6647 |
| Ensembl | ENSG00000142168 |
| OMIM | 147450 |
| UniProt | P00441 |
| Diseases | Amyotrophic Lateral Sclerosis |
| Expression | Motor cortex, Spinal cord, Widespread throughout CNS |
| Key Mutations | |
| A4V (most common in North America), D90A, G93A, H46R, I113T, L126Z, L84F | |
Sod1 — Superoxide Dismutase 1 plays an important role in the study of neurodegenerative diseases. This page provides comprehensive information about this topic, including its mechanisms, significance in disease processes, and therapeutic implications.
SOD1 (Superoxide Dismutase 1) was the first gene linked to familial amyotrophic lateral sclerosis (ALS), marking a pivotal moment in neurodegenerative disease research when mutations were identified in 1993[1]. Located on chromosome 21q22.11, SOD1 encodes a highly conserved metalloenzyme that catalyzes the dismutation of superoxide radical anions to hydrogen peroxide and molecular oxygen. This discovery established the first molecular genetic framework for understanding ALS pathogenesis and remains one of the best-characterized ALS genes.
Over 190 pathogenic mutations in SOD1 have been identified in patients with familial ALS, accounting for approximately 12-20% of familial ALS cases and 1-2% of sporadic ALS[2]. The study of SOD1 has provided critical insights into the mechanisms of selective motor neuron vulnerability and has driven therapeutic development for ALS.
The SOD1 gene spans approximately 11 kb on chromosome 21 and consists of 5 exons encoding the 154-amino acid protein[3]. The gene is highly conserved across species, reflecting its essential function in cellular homeostasis.
SOD1 is one of the most evolutionarily conserved proteins:
This conservation underscores the fundamental importance of superoxide scavenging in aerobic life.
SOD1 is a 16 kDa homodimeric enzyme requiring copper and zinc ions for activity:
The primary enzymatic reaction:
2 O2•- + 2 H+ → H2O2 + O2
This reaction protects cells from oxidative damage caused by superoxide radicals generated during normal cellular respiration.
SOD1 is ubiquitously expressed throughout the body:
Expression data is available from the Allen Human Brain Atlas.
Unlike many disease genes where loss of function causes pathology, SOD1 mutations cause ALS through toxic gain of function[4]:
| Mutation | Type | Prevalence | Clinical Features |
|---|---|---|---|
| A4V | Missense | Most common in North America | Aggressive, rapid progression |
| G93A | Missense | Common in research models | Moderate progression |
| D90A | Missense | Scandinavian founder | Slower progression |
| H46R | Missense | Japanese founder | Very slow progression |
| I113T | Missense | Multiple families | Variable |
The first ALS mouse model was created in 1994 expressing human SOD1 with the G93A mutation:
The first FDA-approved therapy targeting an ALS genetic cause:
Sod1 — Superoxide Dismutase 1 plays an important role in the study of neurodegenerative diseases. This page provides comprehensive information about this topic, including its mechanisms, significance in disease processes, and therapeutic implications.
The study of Sod1 — Superoxide Dismutase 1 has evolved significantly over the past decades. Research in this area has revealed important insights into the underlying mechanisms of neurodegeneration and continues to drive therapeutic development.
Historical context and key discoveries in this field have shaped our current understanding and will continue to guide future research directions.
[1] Rosen DR, Siddique T, Patterson D, et al. Mutations in Cu/Zn superoxide dismutase gene are associated with familial amyotrophic lateral sclerosis. Nature. 1993;362(6415):59-62. DOI:10.1038/362059a0
[2] Abel O, Powell JF, Andersen PM, Al-Chalabi A. ALSoD: A user-friendly online bioinformatics tool for amyotrophic lateral sclerosis genetics. Hum Mutat. 2012;33(9):1345-1351. DOI:10.1002/humu.22157
[3] Deng HX, Hentati A, Tainer JA, et al. Amyotrophic lateral sclerosis and structural defects in Cu,Zn superoxide dismutase. Science. 1993;261(5124):1047-1051. DOI:10.1126/science.8351519
[4] Boillée S, Vande Velde C, Cleveland DW. ALS: a disease of motor neurons and their non-neuronal neighbors. Neuron. 2006;52(1):39-59. DOI:10.1016/j.neuron.2006.09.018
[5] Miller T, Cudkowicz M, Shaw PJ, et al. Phase 1-2 Study of BIIB067 (Tofersen) Targeting SOD1 Mutations. N Engl J Med. 2020;383(2):109-119. DOI:10.1056/NEJMoa2003717