Is Cadasil (Cerebral Autosomal Dominant Arteriopathy With Sub-Cortical Infarcts And Leukoencephalopathy) contagious?

CADASIL (Cerebral Autosomal Dominant Arteriopathy with Sub-cortical Infarcts and Leukoencephalopathy) is not contagious and cannot be transmitted through touch, air, or any form of social contact. It is a strictly genetic condition caused by mutations in the NOTCH3 gene, meaning it is passed down through families rather than spread by pathogens.

What causes CADASIL?

CADASIL is a hereditary small-vessel disease of the brain. It is caused by a mutation in the NOTCH3 gene located on chromosome 19. This mutation leads to an abnormal buildup of a protein in the walls of small blood vessels, which eventually causes the vessels to thicken and narrow. This process restricts blood flow to the brain, leading to the characteristic white matter changes and strokes seen in individuals with CADASIL.

Why is there confusion regarding contagion?

Because CADASIL often presents with neurological symptoms like cognitive decline, mood disorders, and migraines, some people mistakenly associate these symptoms with infectious diseases. However, unlike viruses or bacteria, CADASIL is entirely internal and biological in origin. There is no risk to caregivers, family members, or friends when spending time with someone who has CADASIL; it is impossible to "catch" the condition.

Is CADASIL hereditary?

Yes, CADASIL is inherited in an autosomal dominant pattern. This means that if one parent carries the NOTCH3 gene mutation, there is a 50% chance for each child to inherit the mutation. Key genetic facts include:

• The condition is caused by a defect in the NOTCH3 gene.


• It is not related to diet, lifestyle, or environmental exposure.


• It does not spread through casual contact, sharing meals, or physical intimacy.

Are there environmental triggers?

While the disease is genetic, certain environmental factors can exacerbate symptoms. For example, smoking and uncontrolled hypertension are known to significantly increase the risk of stroke in patients with CADASIL. Managing cardiovascular health is essential for those living with the condition, but these factors do not make the disease contagious.

Next steps

• Consult a neurologist or a genetic counselor to discuss family history and testing options.


• Join the DiseaseMaps.org community to connect with the 57 members currently sharing their experiences with CADASIL.


• Focus on cardiovascular health, such as managing blood pressure and avoiding smoking, to support brain health.

Medical disclaimer: This information is for educational purposes only and should not replace professional medical advice, diagnosis, or treatment.

References

• NIH Genetic and Rare Diseases Information Center (GARD): CADASIL


• Orphanet: Cerebral Autosomal Dominant Arteriopathy with Subcortical Infarcts and Leukoencephalopathy


• OMIM (Online Mendelian Inheritance in Man): NOTCH3 Gene Entry


• CureCADASIL Association