Overview
COL4A1 and COL4A2-related cerebral small vessel disease is a rare inherited condition caused by changes (mutations) in the COL4A1 or COL4A2 genes. These genes provide instructions for making collagen type IV, a protein that forms a key part of the walls of small blood vessels throughout the body, especially in the brain. When these genes are not working properly, the walls of tiny blood vessels become fragile and prone to damage. This disease is sometimes called COL4A1-related brain small vessel disease or COL4A2-related cerebrovascular disease. The most common effects are in the brain, where fragile blood vessels can lead to strokes (both bleeding and blockage types), white matter changes visible on brain scans, and a condition called leukoencephalopathy (damage to the brain's white matter). People may also experience migraines, seizures, and problems with thinking or memory. Some individuals develop symptoms in other organs, including the eyes, kidneys, and muscles. There is currently no cure for this condition. Treatment focuses on managing symptoms, reducing stroke risk, and preventing complications. Blood pressure control is especially important. The severity of the disease varies widely, even within the same family. Some people have mild symptoms while others are more severely affected. Early diagnosis and careful monitoring can help improve quality of life and reduce the risk of serious events like stroke.
Also known as:
Key symptoms:
Stroke or stroke-like episodes, sometimes at a young ageMigraines, often with visual disturbances (aura)Seizures or epilepsyMemory problems or difficulty thinking clearlyWeakness or numbness on one side of the bodyWhite matter changes seen on brain MRI scansSmall bleeds in the brain (microbleeds)Vision problems, including cataracts or abnormal blood vessels in the eyeMuscle cramps or weaknessKidney problems (in some cases)Raynaud's phenomenon (fingers or toes turning white or blue in the cold)Difficulty walking or problems with balance and coordination
Autosomal dominant
Passed on from just one parent; each child has about a 50% chance of inheriting it
Variable
Can begin at different ages, from infancy through adulthood
FDA & Trial Timeline
1 eventMeyer Children's Hospital IRCCS — NA
Data sourced from FDA regulatory filings and ClinicalTrials.gov. Updated periodically.
Treatments
No FDA-approved treatments are currently listed for COL4A1 or COL4A2-related cerebral small vessel disease.
1 clinical trialare actively recruiting — trials can provide access to cutting-edge therapies.
View clinical trials →Specialists
View all specialists →No specialists are currently listed for COL4A1 or COL4A2-related cerebral small vessel disease.
Treatment Centers
8 centersBaylor College of Medicine Rare Disease Center ↗
Baylor College of Medicine
📍 Houston, TX
🏥 NORDStanford Medicine Rare Disease Center ↗
Stanford Medicine
📍 Stanford, CA
🔬 UDNNIH Clinical Center Undiagnosed Diseases Program ↗
National Institutes of Health
📍 Bethesda, MD
🔬 UDNUCLA UDN Clinical Site ↗
UCLA Health
📍 Los Angeles, CA
🔬 UDNBaylor College of Medicine UDN Clinical Site ↗
Baylor College of Medicine
📍 Houston, TX
🔬 UDNHarvard/MGH UDN Clinical Site ↗
Massachusetts General Hospital
📍 Boston, MA
🏥 NORDMayo Clinic Center for Individualized Medicine ↗
Mayo Clinic
📍 Rochester, MN
👤 Mayo Clinic Center for Individualized Medicine
🏥 NORDUCLA Rare Disease Day Program ↗
UCLA Health
📍 Los Angeles, CA
Travel Grants
No travel grants are currently matched to COL4A1 or COL4A2-related cerebral small vessel disease.
Community
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Caregiver Resources
NORD Caregiver Resources
Support, advocacy, and financial assistance for caregivers of rare disease patients.
Mental Health Support
Rare disease caregiving can be isolating. Connect with counseling and peer support.
Family & Caregiver Grants
Financial assistance programs specifically for caregivers of rare disease patients.
Social Security Disability
Learn how rare disease patients may qualify for SSDI/SSI benefits.
Questions for your doctor
Bring these to your next appointment
- Q1.Which gene mutation do I have, and what does that mean for my specific risk of stroke or other complications?,Should other members of my family be tested for this condition?,What blood pressure target should I aim for, and which medications are safest for me?,Are there any medications or activities I should avoid because of my fragile blood vessels?,How often should I have brain MRI scans and other monitoring tests?,What are the warning signs that I should go to the emergency room immediately?,Are there any clinical trials or research studies I could participate in?
Common questions about COL4A1 or COL4A2-related cerebral small vessel disease
What is COL4A1 or COL4A2-related cerebral small vessel disease?
COL4A1 and COL4A2-related cerebral small vessel disease is a rare inherited condition caused by changes (mutations) in the COL4A1 or COL4A2 genes. These genes provide instructions for making collagen type IV, a protein that forms a key part of the walls of small blood vessels throughout the body, especially in the brain. When these genes are not working properly, the walls of tiny blood vessels become fragile and prone to damage. This disease is sometimes called COL4A1-related brain small vessel disease or COL4A2-related cerebrovascular disease. The most common effects are in the brain, where
How is COL4A1 or COL4A2-related cerebral small vessel disease inherited?
COL4A1 or COL4A2-related cerebral small vessel disease follows a autosomal dominant inheritance pattern. Genetic counseling can help families understand recurrence risk and testing options.
Are there clinical trials for COL4A1 or COL4A2-related cerebral small vessel disease?
Yes — 1 recruiting clinical trial is currently listed for COL4A1 or COL4A2-related cerebral small vessel disease on UniteRare. See the clinical trials section on this page for phase, sponsor, and site details sourced from ClinicalTrials.gov.