TCF7L2
Transcription factor 7-like 2 (T-cell specific, HMG-box), also known as TCF7L2 or TCF4, is a protein acting as a transcription factor that, in humans, is encoded by the TCF7L2 gene.[5][6] The TCF7L2 gene is located on chromosome 10q25.2–q25.3, contains 19 exons and has autosomal dominant inheritance.[7][8] The TCF7L2 gene is polymorphic and pleiotropic.[9] As a member of the TCF family, TCF7L2 can form a bipartite transcription factor and influence several biological pathways, including the Wnt signalling pathway.[10]
Single-nucleotide polymorphisms (SNPs) in this gene are especially known to be linked to higher risk to develop type 2 diabetes,[10] gestational diabetes[11] and multiple other diseases.[12][13][14] The SNP rs7903146, within the TCF7L2 gene, is, to date, the most significant genetic marker associated with type 2 diabetes risk.[15]
Function
TCF7L2 is a transcription factor influencing the transcription of several genes thereby exerting a large variety of functions within the cell. It is a member of the TCF family that can form a bipartite transcription factor (β-catenin/TCF) alongside β-catenin.[10] Bipartite transcription factors can have large effects on the Wnt signalling pathway.[10] Stimulation of the Wnt signaling pathway leads to the association of β-catenin with BCL9, translocation to the nucleus, and association with TCF7L2,[17] which in turn results in the activation of Wnt target genes. The activation of the Wnt target genes specifically represses proglucagon synthesis in enteroendocrine cells.[10][8] The repression of TCF7L2 using HMG-box repressor (HBP1) inhibits Wnt signalling.[10] Therefore, TCF7L2 is an effector in the Wnt signalling pathway. TCF7L2's role in glucose metabolism is expressed in many tissues such as gut, brain, liver, and skeletal muscle. However, TCF7L2 does not directly regulate glucose metabolism in β-cells, but regulates glucose metabolism in pancreatic and liver tissues.[18]
The TCF7L2 gene encoding the TCF7L2 transcription factor, exhibits multiple functions through its polymorphisms and thus, is known as a pleiotropic gene. Type 2 diabetes T2DM susceptibility is exhibited in carriers of TCF7L2 rs7903146C>T[19][9] and rs290481T>C[9] polymorphisms.[19][9] TCF7L2 rs290481T>C polymorphism, however, has shown no significant correlation to the susceptibility to gestational diabetes mellitus (GDM) in a Chinese Han population, whereas the T alleles of rs7903146[9] and rs1799884[11] increase susceptibility to GDM in the Chinese Han population.[9][11] The difference in effects of the different polymorphisms of the gene indicate that the gene is indeed pleiotropic.
Structure
The TCF7L2 gene, encoding the TCF7L2 protein, is located on chromosome 10q25.2-q25.3. The gene contains 19 exons and has autosomal dominant inheritance.[7][8] Of the 19 exons, 5 are alternative.[8] The TCF7L2 protein contains 619 amino acids and its molecular mass is 67919 Da.[20] TCF7L2's secondary structure is a helix-turn-helix structure.[21]
Tissue distribution
TCF7L2 is primarily expressed in brain, liver, intestine and fat cells. It does not primarily operate in the β-cells in the pancreas.[22]
Clinical significance
Type 2 Diabetes
Several single nucleotide polymorphisms within the TCF7L2 gene have been associated with type 2 diabetes. Studies conducted by Ravindranath Duggirala and Michael Stern at The University of Texas Health Science Center at San Antonio were the first to identify strong linkage for type 2 diabetes at a region on Chromosome 10 in Mexican Americans [23] This signal was later refined by Struan Grant and colleagues at DeCODE genetics and isolated to the TCF7L2 gene.[24] The molecular and physiological mechanisms underlying the association of TCF7L2 with type 2 diabetes are under active investigation, but it is likely that TCF7L2 has important biological roles in multiple metabolic tissues, including the pancreas, liver and adipose tissue.[22][25] TCF7L2 polymorphisms can increase susceptibility to type 2 diabetes by decreasing the production of glucagon-like peptide-1 (GLP-1).[10]
Gestational Diabetes (GDM)
TCF7L2 modulates pancreatic islet β-cell function strongly implicating its significant association with GDM risk.[11] T alleles of rs7903146[9] and rs1799884[11] TCF7L2 polymorphisms increase susceptibility to GDM in the Chinese Han population.[9][11]
Cancer
TCF7L2 plays a role in colorectal cancer.[12] A frameshift mutation of TCF7L2 provided evidence that TCF7L2 is implicated in colorectal cancer.[26][27] The silencing of TCF7L2 in KM12 colorectal cancer cells provided evidence that TCF7L2 played a role in proliferation and metastasis of cancer cells in colorectal cancer.[12]
Variants of the gene are most likely involved in many other cancer types.[28] TCF7L2 is indirectly involved in prostate cancer through its role in activating the PI3K/Akt pathway, a pathway involved in prostate cancer.[29]
Schizophrenia
Single nucleotide polymorphisms (SNPs) in TCF7L2 gene have shown an increase in susceptibility to schizophrenia in Arab, European and Chinese Han populations.[13] In the Chinese Han population, SNP rs12573128[13] in TCF7L2 is the variant that was associated with an increase in schizophrenia risk. This marker is used as a pre-diagnostic marker for schizophrenia.[13]
Multiple Sclerosis
TCF7L2 is downstream of the WNT/β-catenin pathways. The activation of the WNT/β-catenin pathways have been associated demyelination in multiple sclerosis.[14] TCF7L2 is unregulated during early remyelination, leading scientists to believe that it is involved in remyelination.[14] TCF7L2 could act in dependence or independent of the WNT/β-catenin pathways.[14]
Model organisms
Model organisms have been used in the study of TCF7L2 function. A conditional knockout mouse line called Tcf7l2tm1a(EUCOMM)Wtsi was generated at the Wellcome Trust Sanger Institute.[30] Male and female animals underwent a standardized phenotypic screen[31] to determine the effects of deletion.[32][33][34][35] Additional screens performed: - In-depth immunological phenotyping[36]
Variations of the protein encoding gene are found in rats, zebra fish, drosophila, and budding yeast.[37] Therefore, all of those organisms can be used as model organisms in the study of TCF7L2 function.
Nomenclature
TCF7L2 is the symbol officially approved by the HUGO Gene Nomenclature Committee for the transcription factor 4 gene (TCF4).
See also
References
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Further reading
- Segditsas S, Tomlinson I (December 2006). "Colorectal cancer and genetic alterations in the Wnt pathway". Oncogene. 25 (57): 7531–7. doi:10.1038/sj.onc.1210059. PMID 17143297.
- Florez JC (July 2007). "The new type 2 diabetes gene TCF7L2". Current Opinion in Clinical Nutrition and Metabolic Care. 10 (4): 391–6. doi:10.1097/MCO.0b013e3281e2c9be. PMID 17563454.
- Maruyama K, Sugano S (January 1994). "Oligo-capping: a simple method to replace the cap structure of eukaryotic mRNAs with oligoribonucleotides". Gene. 138 (1–2): 171–4. doi:10.1016/0378-1119(94)90802-8. PMID 8125298.
- Korinek V, Barker N, Morin PJ, van Wichen D, de Weger R, Kinzler KW, Vogelstein B, Clevers H (March 1997). "Constitutive transcriptional activation by a beta-catenin-Tcf complex in APC-/- colon carcinoma". Science. 275 (5307): 1784–7. doi:10.1126/science.275.5307.1784. hdl:20.500.11755/27e2349d-dfbe-4458-9a4e-3fa15f0d2420. PMID 9065401.
- Suzuki Y, Yoshitomo-Nakagawa K, Maruyama K, Suyama A, Sugano S (October 1997). "Construction and characterization of a full length-enriched and a 5'-end-enriched cDNA library". Gene. 200 (1–2): 149–56. doi:10.1016/S0378-1119(97)00411-3. PMID 9373149.
- He TC, Sparks AB, Rago C, Hermeking H, Zawel L, da Costa LT, Morin PJ, Vogelstein B, Kinzler KW (September 1998). "Identification of c-MYC as a target of the APC pathway". Science. 281 (5382): 1509–12. Bibcode:1998Sci...281.1509H. doi:10.1126/science.281.5382.1509. PMID 9727977.
- Barker N, Huls G, Korinek V, Clevers H (January 1999). "Restricted high level expression of Tcf-4 protein in intestinal and mammary gland epithelium". The American Journal of Pathology. 154 (1): 29–35. doi:10.1016/S0002-9440(10)65247-9. PMC 1853446. PMID 9916915.
- Omer CA, Miller PJ, Diehl RE, Kral AM (March 1999). "Identification of Tcf4 residues involved in high-affinity beta-catenin binding". Biochemical and Biophysical Research Communications. 256 (3): 584–90. doi:10.1006/bbrc.1999.0379. PMID 10080941.
- Giannini AL, Vivanco MM, Kypta RM (March 2000). "Analysis of beta-catenin aggregation and localization using GFP fusion proteins: nuclear import of alpha-catenin by the beta-catenin/Tcf complex". Experimental Cell Research. 255 (2): 207–20. doi:10.1006/excr.1999.4785. PMID 10694436.
- Duval A, Busson-Leconiat M, Berger R, Hamelin R (2000). "Assignment of the TCF-4 gene (TCF7L2) to human chromosome band 10q25.3". Cytogenetics and Cell Genetics. 88 (3–4): 264–5. doi:10.1159/000015534. PMID 10828605.
- Duval A, Rolland S, Tubacher E, Bui H, Thomas G, Hamelin R (July 2000). "The human T-cell transcription factor-4 gene: structure, extensive characterization of alternative splicings, and mutational analysis in colorectal cancer cell lines". Cancer Research. 60 (14): 3872–9. PMID 10919662.
- Brantjes H, Roose J, van De Wetering M, Clevers H (April 2001). "All Tcf HMG box transcription factors interact with Groucho-related co-repressors". Nucleic Acids Research. 29 (7): 1410–9. doi:10.1093/nar/29.7.1410. PMC 31284. PMID 11266540.
- Palacino JJ, Murphy MP, Murayama O, Iwasaki K, Fujiwara M, Takashima A, Golde TE, Wolozin B (October 2001). "Presenilin 1 regulates beta-catenin-mediated transcription in a glycogen synthase kinase-3-independent fashion". The Journal of Biological Chemistry. 276 (42): 38563–9. doi:10.1074/jbc.M105376200. PMID 11504726.
- Miravet S, Piedra J, Miró F, Itarte E, García de Herreros A, Duñach M (January 2002). "The transcriptional factor Tcf-4 contains different binding sites for beta-catenin and plakoglobin". The Journal of Biological Chemistry. 277 (3): 1884–91. doi:10.1074/jbc.M110248200. PMID 11711551.
- Graham TA, Ferkey DM, Mao F, Kimelman D, Xu W (December 2001). "Tcf4 can specifically recognize beta-catenin using alternative conformations". Nature Structural Biology. 8 (12): 1048–52. doi:10.1038/nsb718. PMID 11713475.
- Poy F, Lepourcelet M, Shivdasani RA, Eck MJ (December 2001). "Structure of a human Tcf4-beta-catenin complex". Nature Structural Biology. 8 (12): 1053–7. doi:10.1038/nsb720. PMID 11713476.
- Thiele A, Wasner M, Müller C, Engeland K, Hauschildt S (December 2001). "Regulation and possible function of beta-catenin in human monocytes". Journal of Immunology. 167 (12): 6786–93. doi:10.4049/jimmunol.167.12.6786. PMID 11739494.
- Marchenko GN, Marchenko ND, Leng J, Strongin AY (April 2002). "Promoter characterization of the novel human matrix metalloproteinase-26 gene: regulation by the T-cell factor-4 implies specific expression of the gene in cancer cells of epithelial origin". The Biochemical Journal. 363 (Pt 2): 253–62. doi:10.1042/0264-6021:3630253. PMC 1222473. PMID 11931652.
- Leung JY, Kolligs FT, Wu R, Zhai Y, Kuick R, Hanash S, Cho KR, Fearon ER (June 2002). "Activation of AXIN2 expression by beta-catenin-T cell factor. A feedback repressor pathway regulating Wnt signaling". The Journal of Biological Chemistry. 277 (24): 21657–65. doi:10.1074/jbc.M200139200. PMID 11940574.
External links
- TCF7L2 here called TCF4 features on this Wnt pathway web site: Wnt signalling molecules TCFs
- Structure determination of TCF7L2: PDB entry 2GL7 and related publication on PubMed
- PubMed GeneRIFs (summaries of related scientific publications) -
- Weizmann Institute GeneCard for TCF7L2
- Overview of all the structural information available in the PDB for UniProt: Q9NQB0 (Transcription factor 7-like 2) at the PDBe-KB.