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Title: Tbx1  
Author: World Heritage Encyclopedia
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Subject: T-box, Chromosome 22 (human), Human genes, DiGeorge syndrome, Transcription factors
Collection: Human Genes, Transcription Factors
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T-box 1
Available structures
PDB Ortholog search: PDBe, RCSB
External IDs GeneCards:
Species Human Mouse
RefSeq (mRNA)
RefSeq (protein)
Location (UCSC)
PubMed search

T-box transcription factor TBX1 also known as T-box protein 1 and testis-specific T-box protein is a DNA. By attaching to critical regions near genes, the proteins help control the activity of those genes. T-box proteins are called transcription factors on the basis of this action.


  • Gene 1
  • Function 2
  • Clinical signficance 3
  • References 4
  • Further reading 5
  • External links 6


The TBX1 gene is located on the long (q) arm of chromosome 22 at position 11.21, from base pair 18,118,779 to base pair 18,145,669.[1]


The T-box 1 protein appears to be necessary for the normal development of large arteries that carry blood out of the heart, muscles and bones of the face and neck, and glands such as the thymus and parathyroid. Although the T-box 1 protein acts as a transcription factor, it is not yet known which genes are regulated by the protein.

Clinical signficance

Most cases of 22q11.2 deletion syndrome are caused by the deletion of a small piece of chromosome 22. This region of the chromosome contains about 30 genes, including the TBX1 gene. In a small number of affected individuals without a chromosome 22 deletion, mutations in the TBX1 gene are thought to be responsible for the characteristic signs and symptoms of the syndrome. Of the three known mutations, two mutations change one amino acid (a building block of proteins) in the T-box 1 protein. The third mutation deletes a single amino acid from the protein. These mutations likely disrupt the ability of the T-box 1 protein to bind to DNA and regulate the activity of other genes.[2][3][4]

Loss of the TBX1 gene, due to either a mutation in the gene or a deletion of part of chromosome 22, is responsible for many of the features of 22q11.2 deletion syndrome. Specifically, a loss of the TBX1 gene is associated with heart defects, an opening in the roof of the mouth (a cleft palate), distinctive facial features, and low calcium levels, but does not appear to cause learning disabilities.[5][6]


  1. ^ a b "Entrez Gene: T-box 1". 
  2. ^ Baldini A (2003). "DiGeorge's syndrome: a gene at last". Lancet 362 (9393): 1342–3.  
  3. ^ Baldini A (2004). "DiGeorge syndrome: an update". Current Opinion in Cardiology 19 (3): 201–4.  
  4. ^ Yagi H, Furutani Y, Hamada H, Sasaki T, Asakawa S, Minoshima S, Ichida F, Joo K, Kimura M, Imamura S, Kamatani N, Momma K, Takao A, Nakazawa M, Shimizu N, Matsuoka R (2003). "Role of TBX1 in human del22q11.2 syndrome". Lancet 362 (9393): 1366–73.  
  5. ^ Packham EA, Brook JD (2003). "T-box genes in human disorders". Hum Mol Genet. 12 12 (Spec No 1): R37–44.  
  6. ^ Yamagishi H, Srivastava D (2003). "Unraveling the genetic and developmental mysteries of 22q11 deletion syndrome". Trends Mol Med 9 (9): 383–9.  

Further reading

  • Tan X, Anzick SL, Khan SG, Ueda T, Stone G, Digiovanna JJ, Tamura D, Wattendorf D, Busch D, Brewer CC, Zalewski C, Butman JA, Griffith AJ, Meltzer PS, Kraemer KH (May 2013). "Chimeric Negative Regulation of p14ARF and TBX1 by a t(9;22) Translocation Associated with Melanoma, Deafness, and DNA Repair Deficiency". Hum. Mutat. 34 (9): 1250–9.  

External links

This article incorporates text from the United States National Library of Medicine, which is in the public domain.

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