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FOXP3 gene
Reviewed by Medicinsk Expert•Last updated: 2026-10-22•Gene

FOXP3 gene

The FOXP3 gene produces a transcription factor that is essential for the development and function of regulatory T cells, which prevent the body from attacking its own tissues.

Normal Function

The FOXP3 gene provides instructions for producing the forkhead box P3 (FOXP3) protein. This protein attaches to specific regions of DNA and helps control the activity of genes involved in regulating the immune system. Because of its role in controlling gene activity, the FOXP3 protein is called a transcription factor.

This protein is essential for the production and normal function of certain immune cells called regulatory T cells, which play an important role in preventing autoimmunity. Autoimmunity occurs when the body attacks its own tissues and organs by mistake. The FOXP3 protein is found primarily in the thymus, where these regulatory T cells are produced.

Health Conditions Related to Genetic Changes

Immune dysregulation, polyendocrinopathy, enteropathy, X-linked syndrome

More than 60 mutations in the FOXP3 gene have been found to cause immune dysregulation, polyendocrinopathy, enteropathy, X-linked (IPEX) syndrome. This rare condition is characterized by the development of multiple autoimmune disorders, typically affecting the intestines, skin, and hormone-producing (endocrine) glands.

  • Mechanism: Most mutations change a protein building block in the region of the FOXP3 protein that binds to DNA or lead to the production of an abnormally short, nonfunctional protein.
  • Impact: These mutations impair the normal function of regulatory T cells. Without these cells, the body cannot control immune responses, leading to the body attacking its own tissues and organs.

Hashimoto's disease and Type 1 diabetes

MedlinePlus Genetics provides information regarding the association of the FOXP3 gene with Hashimoto's disease and Type 1 diabetes.

Frequently Asked Questions

Because IPEX syndrome involves a fundamental failure in immune regulation, patients require lifelong monitoring by specialists, including immunologists, gastroenterologists, and endocrinologists. Regular check-ups are necessary to monitor for new autoimmune conditions, such as kidney disease (nephritis) or blood disorders, which can develop at any time. Blood tests to track immune cell counts and hormone levels are essential to adjust treatments promptly and prevent organ damage.
Symptoms usually appear in infancy, often within the first few months of life. The hallmark early sign is severe, watery diarrhea that does not respond to standard treatments, which can lead to significant dehydration and failure to thrive. This is frequently accompanied by a severe, blistering skin rash (dermatitis) and early-onset autoimmune disorders such as type 1 diabetes or thyroiditis. The rapid onset of these multi-system issues is a key diagnostic clue.
Immunosuppressive medications, such as calcineurin inhibitors (e.g., tacrolimus or cyclosporine), are often used to control the overactive immune response and reduce inflammation in the gut and skin. While these drugs can help manage symptoms and improve quality of life, they do not cure the underlying genetic defect. They require careful dosing and monitoring because they can increase the risk of infections and other side effects, and their effectiveness may vary over time.
IPEX syndrome is an X-linked condition, meaning the FOXP3 gene is located on the X chromosome. Males have only one X chromosome, so a single mutation in that gene is sufficient to cause the disease. Females have two X chromosomes, so they would need mutations in both copies of the gene to be affected, which is extremely rare. However, females can be carriers and may occasionally show mild symptoms if the normal X chromosome is inactivated in a large number of cells, a phenomenon known as skewed X-inactivation.
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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