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COL4A1 gene
Reviewed by Medicinsk Expert•Last updated: 2026-10-22•Gene

COL4A1 gene

The COL4A1 gene provides instructions for making type IV collagen, a protein essential for the structure of basement membranes that support tissues throughout the body.

Normal Function

The COL4A1 gene provides instructions for making one component of type IV collagen, which is a flexible protein important in the structure of many tissues throughout the body. Specifically, this gene makes the alpha1(IV) chain of type IV collagen. This chain combines with another alpha1 chain and a different type of alpha (IV) chain called alpha2 to make a complete type IV collagen alpha1-1-2 molecule.

Type IV collagen molecules attach to each other to form complex protein networks. These protein networks are the main component of basement membranes, which are thin sheet-like structures that separate and support cells in many tissues. Type IV collagen alpha1-1-2 networks play an important role in the basement membranes in virtually all tissues throughout the body, particularly the basement membranes surrounding the body's blood vessels (vasculature). The type IV collagen network helps the basement membranes interact with nearby cells, playing a role in cell movement (migration), cell growth and division (proliferation), cell maturation (differentiation), and the survival of cells.

Health Conditions Related to Genetic Changes

COL4A1-related brain small-vessel disease

Mutations in the COL4A1 gene have been found to cause COL4A1-related brain small-vessel disease. This condition is characterized by stroke and eye abnormalities. Most identified mutations replace the amino acid glycine with a different amino acid in the alpha1(IV) chain, which prevents the chain from combining with other chains to form a complete type IV collagen molecule. This prevents protein networks from forming and basement membranes from developing properly, causing blood vessels to become fragile.

Familial porencephaly

Mutations in the COL4A1 gene have been found to cause familial porencephaly, which is characterized by early stroke and brain cysts. Similar to other COL4A1-related disorders, these mutations prevent the formation of complete type IV collagen molecules, leading to weakened basement membranes and fragile blood vessels in the brain.

Hereditary angiopathy with nephropathy, aneurysms, and muscle cramps syndrome

Mutations in the COL4A1 gene have been found to cause hereditary angiopathy with nephropathy, aneurysms, and muscle cramps (HANAC) syndrome. This condition is characterized by weakened blood vessels in the brain and throughout the body, kidney disease, muscle cramps, and eye abnormalities. The underlying mechanism involves the disruption of type IV collagen production, which weakens basement membranes in the eyes and kidneys.

Anophthalmia/Microphthalmia

MedlinePlus Genetics provides information about Anophthalmia/Microphthalmia.

Other Names for This Gene

  • arresten
  • CO4A1_HUMAN
  • COL4A1 NC1 domain
  • collagen alpha-1(IV) chain
  • collagen alpha-1(IV) chain preproprotein
  • collagen IV, alpha-1 polypeptide
  • collagen of basement membrane, alpha-1 chain
  • collagen type IV alpha 1
  • collagen, type IV, alpha 1

Frequently Asked Questions

ntihypertensive therapy to keep blood pressure below 130/80 mmHg is advised. Avoid high-intensity exercise that spikes blood pressure, and use protective headgear during contact sports. Some clinicians consider low-dose aspirin for patients with a history of small vessel bleeding, but this should be individualized after weighing bleeding risk.
The mutations weaken small brain vessels, making them prone to rupture or occlusion. Sudden neurological deficits—such as weakness on one side of the body, slurred speech, severe headache, visual disturbances, or loss of coordination—should prompt immediate medical attention. Early imaging can improve outcomes.
Patients may develop retinal vascular abnormalities, optic nerve hypoplasia, or cataracts. Routine ophthalmologic exams, including dilated fundus photography and optical coherence tomography, are recommended annually or when visual symptoms arise. Early detection allows for timely management of vision changes.
DNA test that sequences the COL4A1 gene identifies pathogenic variants. If a mutation is found, first-degree relatives should be offered testing, as they may carry the same risk. Genetic counseling helps families understand inheritance patterns and plan for surveillance or preventive care.===
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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