De novo mutation in the NOTCH3 gene causing CADASIL

Area of Science:

• Neurogenetics
• Vascular Neurology
• Hereditary Neurological Disorders

Background:

• Cerebral autosomal dominant arteriopathy with subcortical infarcts and leucoencephalopathy (CADASIL) is a common inherited cerebrovascular disease.
• It is typically caused by autosomal dominant mutations in the NOTCH3 gene, often with a family history.
• Symptoms include stroke, migraine with aura, mood disorders, and dementia.

Observation:

• A patient presented with clinical and neuroimaging features strongly suggestive of CADASIL.
• The patient exhibited migraine, stroke, and white matter abnormalities.
• Crucially, the patient had no first-degree relatives with similar symptoms.

Findings:

• Genetic analysis revealed a de novo mutation in the NOTCH3 gene.
• This finding indicates a spontaneous genetic cause for the patient's CADASIL-like condition.
• The mutation occurred without being inherited from affected parents.

Implications:

• This case expands the known genetic etiologies of CADASIL.
• It underscores the importance of considering de novo mutations in sporadic presentations of hereditary neurological disorders.
• Further research into de novo mutations in CADASIL may reveal new diagnostic and therapeutic targets.