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TCF4 gene
Reviewed by Medicinsk Expert•Last updated: 2026-10-22•Gene

TCF4 gene

The TCF4 gene provides instructions for making a transcription factor that regulates gene activity essential for nervous system development and function.

Normal Function

The TCF4 gene provides instructions for making a protein that attaches (binds) to specific regions of DNA and helps control the activity of many other genes. On the basis of this action, the TCF4 protein is known as a transcription factor. The TCF4 protein is part of a group of proteins known as E-proteins. E-proteins bind to a specific sequence of DNA known as an E-box and are involved in many aspects of development.

The TCF4 protein is found in the brain, muscles, lungs, and heart. It plays a role in the maturation of cells to carry out specific functions (cell differentiation) and the self-destruction of cells (apoptosis).

Health Conditions Related to Genetic Changes

Pitt-Hopkins syndrome

At least 50 mutations in the TCF4 gene have been found to cause Pitt-Hopkins syndrome, a condition characterized by severe intellectual disability and breathing problems. Mutations include deletions of DNA building blocks (nucleotides), deletions of the entire TCF4 gene, or single nucleotide replacements.

These mutations disrupt the protein's ability to bind to DNA and control the activity of certain genes, particularly those involved in nervous system development and function. This loss of function contributes to the signs and symptoms of the syndrome.

Distal 18q deletion syndrome

The TCF4 gene is involved in some cases of distal 18q deletion syndrome, which occurs when a piece of the long (q) arm of chromosome 18 is missing. People with this disorder whose deletions include the TCF4 gene usually have signs and symptoms of Pitt-Hopkins syndrome in addition to other features associated with the loss of nearby genes.

Fuchs endothelial dystrophy

The TCF4 gene is also associated with Fuchs endothelial dystrophy.

Other Names for This Gene

  • bHLHb19
  • class B basic helix-loop-helix protein 19
  • E2-2
  • immunoglobulin transcription factor 2
  • ITF-2
  • ITF2
  • ITF2_HUMAN
  • SEF-2
  • SEF2
  • TCF-4

Frequently Asked Questions

Children with Pitt-Hopkins syndrome benefit from a multidisciplinary approach including physical therapy for motor skills, occupational therapy for daily living activities, speech therapy for communication, and educational support. Management of breathing issues, seizures, and gastrointestinal problems is also crucial, often involving medication or specialized interventions.
Individuals with Pitt-Hopkins syndrome often experience characteristic breathing abnormalities, including episodes of hyperventilation (rapid, deep breathing) followed by apnea (pauses in breathing), especially during wakefulness. Management may involve monitoring, avoiding triggers, and sometimes medications or respiratory support, though specific treatments vary based on the individual's needs.
Pitt-Hopkins syndrome is primarily diagnosed through genetic testing that looks for mutations or deletions in the TCF4 gene. This can involve chromosomal microarray analysis or targeted gene sequencing. Clinical evaluation of characteristic features like severe intellectual disability, distinctive facial features, and breathing abnormalities also guides the diagnosis.
Pitt-Hopkins syndrome is typically caused by a new (de novo) mutation in the TCF4 gene, meaning it occurs spontaneously in the affected individual and is not inherited from the parents. In very rare cases, a parent might have a mosaic form of the mutation, leading to a small recurrence risk.
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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