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NOTCH3 gene
Reviewed by Medicinsk Expert•Last updated: 2026-10-22•Gene

NOTCH3 gene

The NOTCH3 gene is essential for the maintenance of vascular smooth muscle cells, and its mutations are primarily linked to inherited stroke disorders and spinal abnormalities.

Normal Function

The NOTCH3 gene provides instructions for a receptor protein that spans the cell membrane. When a ligand binds to the extracellular end of the protein, the intracellular end—known as the NOTCH3 intracellular domain (NICD)—detaches and enters the cell nucleus to control gene activity. This protein is critical for the function and survival of vascular smooth muscle cells, which surround blood vessels, particularly those supplying the brain.

Health Conditions Related to Genetic Changes

Cerebral autosomal dominant arteriopathy with subcortical infarcts and leukoencephalopathy (CADASIL)

More than 270 mutations in the NOTCH3 gene cause CADASIL. Most of these mutations involve the addition or deletion of a cysteine molecule in the protein's EGF-like domain. This disruption impairs the function of vascular smooth muscle cells, leading to their self-destruction (apoptosis). The resulting damage to these cells causes recurrent strokes and other neurological symptoms.

Lateral meningocele syndrome

Mutations in the final exon of the NOTCH3 gene cause lateral meningocele syndrome. These mutations result in a truncated NICD that lacks the signal for its own breakdown, causing it to persist in the cell nucleus and abnormally influence gene activity. The condition is characterized by lateral meningoceles—protrusions of the membranes surrounding the spinal cord through gaps in the vertebrae—which can damage nerves.

Frequently Asked Questions

Managing hypertension, controlling cholesterol, avoiding smoking, and maintaining a healthy weight are key. Antiplatelet therapy may be considered in high‑risk patients, but the decision should be individualized by a neurologist. Regular MRI surveillance can help detect silent lesions early.
The mutation causes abnormal accumulation of the NOTCH3 protein in vascular smooth muscle cells, leading to their degeneration and loss of vessel integrity. This results in chronic small‑vessel disease, reduced blood flow, and increased susceptibility to ischemic events.
Typical clues include a history of migraines with aura, transient ischemic attacks, or strokes before age 60, followed by cognitive decline, mood changes, or gait disturbances. MRI findings of white‑matter lesions or small subcortical infarcts support the diagnosis. Early recognition allows for risk‑factor modification and monitoring.
Testing typically involves sequencing the NOTCH3 gene to identify pathogenic variants, often through a targeted panel or whole‑exome sequencing. A confirmed mutation supports a CADASIL diagnosis and informs family screening. Variants of uncertain significance require careful interpretation with clinical correlation and may need functional studies. Genetic counseling is essential to explain results and implications for relatives.===
Source: MedlinePlus, National Library of Medicine

MedlinePlus brings together authoritative health information from the National Library of Medicine (NLM), the National Institutes of Health (NIH), and other government agencies and health-related organizations.

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