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TGIF1 gene
Reviewed by Medicinsk Expert•Last updated: 2026-10-22•Gene

TGIF1 gene

The TGIF1 gene provides instructions for making a protein that regulates embryonic development and brain formation by controlling gene activity.

Normal Function

The TGIF1 gene provides instructions for making a protein called TG-interacting factor. This protein is a transcription factor, meaning it regulates the activity of certain genes by attaching to specific regions of DNA or interacting with other DNA-binding proteins. It is essential for the normal development of the forebrain.

TG-interacting factor regulates signaling pathways critical for embryonic development, including:

  • Blocking signals from the transforming growth factor beta (TGF-β) pathway.
  • Preventing the molecule retinoic acid (a form of vitamin A) from regulating gene activity.

By blocking these pathways, the protein ensures that specific genes are turned off at the appropriate time during development.

Health Conditions Related to Genetic Changes

Nonsyndromic holoprosencephaly

At least 13 mutations in the TGIF1 gene have been linked to nonsyndromic holoprosencephaly, a condition where the brain fails to divide into two hemispheres during early development. TGIF1 mutations are the fourth most common cause of this condition.

These mutations disrupt the protein's ability to bind with DNA or interact with other proteins. Consequently, the protein cannot effectively block the TGF-β pathway or retinoic acid. When these signaling pathways are not properly regulated, the forebrain does not separate, leading to the abnormal brain and facial development characteristic of this condition.

Frequently Asked Questions

Nonsyndromic holoprosencephaly (HPE) refers to cases where the brain malformation occurs without associated abnormalities in other organ systems, such as the heart, kidneys, or eyes. TGIF1 mutations are a specific genetic cause of this nonsyndromic form, distinguishing it from syndromic HPE, which is often linked to chromosomal abnormalities or other genes that result in multiple congenital anomalies. Identifying the specific gene involved helps in providing accurate genetic counseling and prognosis for the family.
There is currently no medical or surgical treatment that can reverse the underlying brain malformation caused by TGIF1 mutations. Management is supportive and focuses on addressing specific symptoms, such as seizures, feeding difficulties, or vision and hearing impairments. Multidisciplinary care involving neurologists, pediatricians, and therapists is essential to maximize developmental potential and quality of life for the affected individual.
Yes, if a child is diagnosed with a specific TGIF1 mutation, parents can undergo targeted genetic testing to determine if they are carriers. Since HPE is often autosomal dominant, the mutation may be inherited from a parent or arise de novo (newly) in the child. If a parent is found to be a carrier, they have a 50 percent chance of passing the mutation to future children. If the mutation is de novo, the recurrence risk for future pregnancies is generally low, though not zero due to the possibility of parental germline mosaicism.
Diagnosis typically begins with prenatal or postnatal imaging, such as ultrasound, MRI, or CT scans, which reveal the failure of the forebrain to divide into two hemispheres. To confirm the genetic cause, genetic testing is performed, usually starting with a chromosomal microarray to rule out large deletions or duplications. If the microarray is normal, targeted gene sequencing or a gene panel that includes TGIF1 is used to identify specific point mutations or small indels in the gene.
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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