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GTF2I gene
Reviewed by Medicinsk Expert•Last updated: 2026-10-22•Gene

GTF2I gene

The GTF2I gene provides instructions for producing proteins that regulate gene activity and play a role in brain development and immune function.

Normal Function

The GTF2I gene provides instructions for making two proteins, TFII-I and BAP-135. TFII-I is a transcription factor, meaning it attaches to specific areas of DNA to help regulate the activity of other genes. This protein is active in the brain and many other tissues, where it is involved in coordinating cell growth and division, controlling the flow of calcium into cells, and supporting myelination—the formation of the protective myelin sheath around nerve cells that promotes rapid nerve impulse transmission.

The second protein, BAP-135, is active in B cells, a specialized type of white blood cell. When a B cell detects a foreign substance like a virus, BAP-135 is activated as part of the chemical signaling process that instructs the cell to mature, divide, and produce antibodies to fight infection.

Health Conditions Related to Genetic Changes

7q11.23 duplication syndrome

This syndrome is caused by a duplication of a region on chromosome 7 that includes the GTF2I gene. Individuals with this condition have an extra copy of the gene in each cell. While the exact mechanism is unclear, this extra copy is associated with various neurological and behavioral problems, including:

  • Anxiety disorders (such as social phobias and selective mutism)
  • Attention-deficit/hyperactivity disorder (ADHD)
  • Physical aggression
  • Excessively defiant behavior (oppositional disorder)
  • Autistic behaviors affecting communication and social interaction

Affected individuals do not appear to have immune abnormalities related to this disorder.

Williams syndrome

Williams syndrome is caused by a deletion of a region on chromosome 7 that includes the GTF2I gene, leaving individuals with only one functional copy of the gene. This condition is characterized by mild to moderate intellectual disability, unique personality traits, distinctive facial features, and cardiovascular problems. The loss of the GTF2I gene is thought to contribute to:

  • Intellectual disability
  • Behavioral differences, such as increased sociability and anxiety-related behaviors
  • Reduced myelination in parts of the brain, which may influence behavioral features

People with Williams syndrome do not appear to have immune abnormalities related to the condition.

Frequently Asked Questions

Targeted microarray analysis can detect copy number variations in the 7q11.23 region. For a more detailed assessment, whole-genome sequencing with copy number analysis may be used. Prenatal testing (amniocentesis or chorionic villus sampling) can identify duplications or deletions early, allowing for informed family planning.
Cognitive-behavioral therapy (CBT) tailored to social anxiety is effective. Pharmacologic options include selective serotonin reuptake inhibitors (SSRIs) or anxiolytics, but dosing should be cautious due to potential sensitivity. A combination of CBT and medication often yields the best outcomes.
The extra copy of GTF2I increases transcription factor activity, which can dysregulate downstream genes involved in neural circuitry and neurotransmitter balance. This may heighten sensitivity to stress and impair attention regulation, manifesting as anxiety disorders and ADHD. Understanding this mechanism guides targeted behavioral and pharmacologic interventions.
While the deletion contributes to the characteristic cardiovascular and connective tissue features of Williams syndrome, immune function is typically normal. Routine immunologic screening is not routinely indicated unless clinical signs of infection arise. However, clinicians should remain vigilant for any atypical infections.
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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