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FOXC1 gene

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

FOXC1 gene

The FOXC1 gene encodes a transcription factor that plays a vital role in the early development of the eye, as well as the heart, kidneys, and brain.

Normal Function

The FOXC1 gene provides instructions for making a protein that attaches (binds) to specific regions of DNA and regulates the activity of other genes; therefore, the FOXC1 protein is called a transcription factor. This protein plays a critical role in the early development of the front part of the eye, known as the anterior segment, which includes the iris, the lens, and the cornea. Studies suggest the protein may also help adult eye cells respond to oxidative stress, which occurs when unstable molecules called free radicals accumulate and damage cells. The FOXC1 protein is also involved in the normal development of the heart, kidneys, and brain.

Health Conditions Related to Genetic Changes

Axenfeld-Rieger syndrome

More than 50 mutations in the FOXC1 gene have been found to cause Axenfeld-Rieger syndrome type 3. This condition primarily affects the development of the anterior segment of the eye. Many mutations reduce the amount of functional FOXC1 protein or result in a defective protein. Conversely, other changes, such as gene duplication, increase the amount or function of the protein. Having either too little or too much of this protein disrupts the regulation of genes required for normal development.

Peters anomaly

At least two mutations in the FOXC1 gene have been found to cause Peters anomaly, a condition characterized by abnormal development of the anterior segment and clouding of the cornea. These mutations likely disrupt the protein's ability to regulate developmental genes, leading to abnormal formation of the iris and cornea.

Other disorders

  • Iridogoniodysgenesis type 1: This condition involves underdevelopment of the iris and an elevated risk of increased pressure in the eye (glaucoma).
  • Brain development abnormalities: Mutations that change single amino acids in the FOXC1 protein have been associated with defects of the cerebellum, the part of the brain involved in coordinating movement.
  • Dandy-Walker malformation: Deletions of genetic material from chromosome 6 that include the FOXC1 gene have been associated with this structural abnormality of the cerebellum.

Frequently Asked Questions

The most common eye symptom is a persistent white ring of tissue (posterior embryotoxon) around the pupil, which can lead to glaucoma (increased eye pressure). This pressure buildup can damage the optic nerve and cause vision loss if not monitored and treated early. Patients may also experience a small cornea (microcornea) or an abnormally shaped iris.
Yes, it is typically inherited in an autosomal dominant pattern, meaning only one copy of the mutated gene is needed to cause the condition. If a parent has the mutation, there is a 50 percent chance of passing it to each child. However, some cases arise from new (de novo) mutations with no family history. Genetic counseling is recommended for families to assess risk and discuss testing options.
Patients should be monitored for dental abnormalities, such as missing teeth or small teeth (hypodontia or microdontia), and facial features like a broad nasal bridge. Additionally, because FOXC1 plays a role in heart and kidney development, some individuals may have congenital heart defects or kidney issues, so regular cardiac and renal screenings are often part of the long-term care plan.
Diagnosis usually begins with a comprehensive eye exam by an ophthalmologist to identify structural anomalies like the posterior embryotoxon. Genetic testing is then performed to confirm a mutation in the FOXC1 gene. Doctors may also order echocardiograms to check for heart defects and dental evaluations to assess for missing or malformed teeth, which are common associated features.
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.