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TAF1 gene
Reviewed by Medicinsk Expert•Last updated: 2026-10-22•Gene

TAF1 gene

The TAF1 gene plays a vital role in regulating gene activity throughout the body and is essential for the normal function of neurons in the brain.

Normal Function

The TAF1 gene provides instructions for making part of a protein called transcription factor IID (TFIID). This protein is active in cells and tissues throughout the body, where it attaches (binds) to DNA to regulate the activity of most genes. The TAF1 gene is part of a complex region of DNA known as the TAF1/DYT3 multiple transcript system. This region consists of short stretches of DNA from the TAF1 gene plus extra segments of genetic material. These stretches can be combined in different ways to create various sets of instructions for making proteins, which researchers believe are critical for the normal function of nerve cells (neurons) in the brain.

Health Conditions Related to Genetic Changes

X-linked dystonia-parkinsonism

Several changes in the TAF1/DYT3 multiple transcript system have been identified in people with X-linked dystonia-parkinsonism, a condition affecting movement found only in people of Filipino descent.

  • Single-nucleotide changes: Some gene changes alter single DNA building blocks (nucleotides), known as disease-specific single-nucleotide changes (DSCs).
  • Deletions: Another genetic change involves the deletion of a small number of nucleotides.
  • Retrotransposon insertion: The condition may be related to an extra segment of DNA resulting from the insertion of a retrotransposon—a piece of DNA that can move to different positions in the genetic material—which can disrupt gene function.

Researchers suspect these changes disrupt the regulation of critical genes in neurons, leading to the death of cells in the caudate nucleus and putamen, regions of the brain critical for movement, learning, and memory.

Other Names for This Gene

  • BA2R, CCG1, CCGS, Cell cycle gene 1 protein, cell cycle, G1 phase defect, complementation of cell cycle block, G1-to-S, DYT3, DYT3/TAF1, KAT4, N-TAF1, NSCL2, P250, TAF(II)250, TAF1 RNA polymerase II, TATA box binding protein (TBP)-associated factor, 250kDa, TAF1_HUMAN, TAF2A, TAFII-250, TAFII250, TATA box binding protein associated factor 1, TATA box-binding protein-associated factor 1, TATA box-binding protein-associated factor 2A, TBP-associated factor 1, TBP-associated factor 250 kDa, TBP-associated factor, RNA polymerase II, 250-kD, transcription factor TFIID p250 polypeptide, Transcription initiation factor TFIID 250 kDa subunit, Transcription initiation factor TFIID subunit 1

Frequently Asked Questions

XDP typically begins with symptoms of dystonia, which are involuntary, sustained muscle contractions causing twisting and repetitive movements or abnormal postures. As the condition progresses, parkinsonism symptoms may develop, including slowness of movement (bradykinesia), rigidity, and tremor. These symptoms primarily affect movement.
Diagnosis of XDP is based on clinical symptoms, family history, and genetic testing. Given that it exclusively affects individuals of Filipino descent, this demographic information is a key diagnostic clue. Genetic testing specifically looks for the characteristic mutations (single-nucleotide changes, deletions, or retrotransposon insertions) within the TAF1/DYT3 multiple transcript system.
Treatment for XDP is primarily symptomatic and supportive. It may include medications to help manage dystonia and parkinsonism symptoms, such as anticholinergics, benzodiazepines, or levodopa. Physical therapy, occupational therapy, and speech therapy can also help improve quality of life. In some cases, deep brain stimulation (DBS) may be considered for severe dystonia.
s an X-linked condition, XDP primarily affects males, who inherit the altered TAF1 gene on their single X chromosome. Females, with two X chromosomes, are typically carriers and usually do not show symptoms or have much milder ones. Genetic counseling is crucial for affected families of Filipino descent to understand inheritance patterns, assess risks for male offspring, and discuss family planning options.
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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