Neuromuscular implications in CADASIL.

Area of Science:

• Neurology
• Genetics
• Mitochondrial Biology

Background:

• Notch3 gene mutations are primarily known for causing cerebral autosomal dominant arteriopathy with subcortical infarcts and leukoencephalopathy (CADASIL).
• Emerging evidence suggests Notch3 mutations may also affect peripheral nerves and skeletal muscles.

Purpose of the Study:

• To review existing literature on neuromuscular involvement in patients with Notch3 mutations and CADASIL.
• To explore the association between Notch3 mutations and mitochondrial dysfunction in skeletal muscle.

Main Methods:

• A systematic literature search was conducted using MEDLINE and relevant keywords.
• Six articles focusing on neuromuscular manifestations in CADASIL were selected and analyzed.

Main Results:

• Case studies revealed CADASIL patients presenting with myopathic symptoms, including muscle weakness and wasting.
• Diagnostic workups showed abnormalities in nerve conduction, electromyography, and muscle biopsies, with evidence of mitochondrial dysfunction (e.g., ragged red fibers, reduced respiratory chain activity, mtDNA mutations).

Conclusions:

• Notch3 mutations are associated with mitochondrial disease, particularly impacting skeletal muscle.
• The exact mechanism linking Notch3 mutations to mitochondrial DNA mutations requires further investigation.
• Systematic screening for neuromuscular involvement in Notch3 mutation carriers is recommended for improved patient management and prognosis.