Severe brain involvement in 5q spinal muscular atrophy type 0

Area of Science:

• Neurology
• Genetics
• Pediatrics

Background:

• Spinal muscular atrophy (SMA) type 0 is the most severe form of SMA, characterized by early-onset muscle weakness.
• The condition is linked to mutations in the SMN1 gene and typically results in mortality within weeks of birth.

Observation:

• This study reports on three patients with SMA type 0 who survived beyond one year of age.
• These patients exhibited diffuse and progressive brain abnormalities on magnetic resonance imaging (MRI).

Findings:

• The observed brain abnormalities were not typically associated with the usual presentation of SMA.
• Severe central nervous system involvement may represent the terminal manifestation of an extreme SMA phenotype.

Implications:

• This suggests that substantial reduction of SMN protein in the brain can lead to severe neurological deficits in SMA type 0.
• Further research is warranted to understand the full spectrum of neurological involvement in severe SMA phenotypes.