CADASIL: a monogenic condition causing stroke and subcortical vascular dementia.

Area of Science:

• Neurology
• Genetics
• Vascular Biology

Background:

• Cerebral autosomal dominant arteriopathy with subcortical infarcts and leukoencephalopathy (CADASIL) is an inherited small vessel disease.
• It is caused by mutations in the Notch3 gene.
• CADASIL leads to subcortical strokes, vascular dementia, and frequently migraine with aura.

Purpose of the Study:

• To investigate the underlying mechanisms of vessel wall degeneration in CADASIL.
• To understand the role of Notch3 mutations in vascular smooth muscle cell function.
• To characterize the specific angiopathy and lesion patterns in CADASIL.

Main Methods:

• Analysis of Notch3 mutations.
• Magnetic resonance imaging (MRI) to identify lesion patterns.
• Ultrastructural examination of vascular basal lamina.
• Assessment of vascular smooth muscle cell function.

Main Results:

• Notch3 mutations are the primary cause of CADASIL.
• MRI reveals a microangiopathic pattern, notably affecting temporopolar white matter and arcuate fibers.
• Angiopathy features unique basal lamina deposits and vascular smooth muscle cell degeneration.
• Evidence suggests functional impairment of vascular smooth muscle cells.

Conclusions:

• CADASIL pathogenesis involves Notch3-mediated vascular smooth muscle cell dysfunction and basal lamina abnormalities.
• Understanding these mechanisms provides insights into small vessel disease and ischemic damage.
• CADASIL serves as a model for studying vessel wall degeneration.