A Brazilian study found pathogenic gene variants in 30 people with motor neuron disease
Original source
Genetic profile of motor neuron disease in a multiregional Brazilian cohort: an 18-year real-world experience in 1,911 patients. (opens in a new tab)Compass summarised this from the study's abstract.
Study details
- Studied in
- Human
A retrospective study of 1,911 people with motor neuron disease in Brazil identified pathogenic or likely pathogenic variants in 30 patients without the ALS8 founder variant. The variants occurred in six genes, most often SOD1 and C9orf72. Genetic testing expanded after 2020, but only 17.3% of patients without ALS8 were tested.
Why this matters
The findings show that genetic causes extended beyond ALS8 in this Brazilian clinical population. Testing was more common among younger people and those with a family history, higher educational attainment or suspected frontotemporal dementia, suggesting that access was uneven. The results may support broader testing and family counselling, but this study does not itself change treatment for anyone.
Limitations and context
This was a retrospective, clinically directed study across six rehabilitation hospitals. Testing was not performed uniformly, so the genetic findings may not represent all patients in the cohort. The study also reflects one Brazilian healthcare network and reports associations rather than proving that socioeconomic factors caused differences in testing access.