Atlas of Genetics and Cytogenetics in Oncology and Haematology
TP63 (tumor protein p63)
| Identity |
| Other names | AIS |
| B(p51A) | |
| B(p51B) | |
| EEC3 | |
| KET | |
| LMS | |
| NBP | |
| OFC8 | |
| RHS | |
| SHFM4 | |
| TP53CP | |
| TP53L | |
| TP73L | |
| p40 | |
| p51 | |
| p53CP | |
| p63 | |
| p73H | |
| p73L | |
| HGNC (Hugo) | TP63 |
| LocusID (NCBI) | 8626 |
| Location | 3q28 |
| Location_base_pair | Starts at 189349216 and ends at 189615068 bp from pter ( according to hg19-Feb_2009) [Mapping] |
| DNA/RNA |
| Note | Human TP63 was first isolated from human total genomic DNA by screening with an 800 bp PCR fragment obtained from probing with primers designed to anneal to regions in contiguous exons of p53 and p73, including the intervening introns (Yang et al., 1998). The resulting clones recovered from SK-N-MC neuroepithelioma total genomic DNA encoded proteins with two different N termini (TA and ΔN) and five different C termini (α, β, γ, δ, and ε; figure 1) (Yang et al., 1998; Mangiulli et al., 2009). Short splicing isoforms lacking exon 4 have been observed in invasive breast carcinomas (de Biase et al., 2010) that are not presented in figure 1. |
| Description | The TP63 gene spans 267 kb, contains 16 exons, encodes 680 amino acids for the longest isoform, and has 12 isoforms formed by alternative promoter usage and alternative splicing (Augustin et al., 1998; Muzny et al., 2006; Parsons et al., 2009; Vanbokhoven et al., 2011). The six variants with TA and ΔN at the N-terminal and α, β, γ at the C-terminal are the most known and studied isoforms. |
| Protein |
 | |
| Figure 1. The Human TP63 isoforms. A) Human TAp63 and ΔNp63 with α, β, γ, δ, ε splice variant protein isoforms are shown. TP63 protein functional domains are depicted. TA: transactivation domain; ΔN: N-terminally truncated isoform; DBD: DNA binding domain; OD: oligomerization domain; the second TA domain; SAM: sterile alpha motif; ID: inhibitory domain. B) Exon schema and corresponding domains of the human TP63 gene. Alternative promoter use produces TA (transactivation) and N-terminally truncated (ΔN) isoforms, and alternative splicing produces C-terminal variants. Alternatively spliced forms of exon 10 are designated as 10* and 10**. | |
| Description | Human TP63 encodes the p63 protein, of which the longest isoform contains 680 amino acids, has molecular weights ranging from 44 to 77 kDa, depending on specific alternative promoter usage and alternative splicing (Augustin et al., 1998; Yang et al., 1998). TP63 comprises up to five types of domains, depending on the isoform, and may contain transactivation (TA), DNA Binding (DBD), oligomerization (OD), C-terminal sterile alpha motif (SAM), and/or C-terminal transcription inhibitory (ID) domains (Moll and Slade, 2004). The N-terminus may consist of a TA domain or a truncated version (ΔN) lacking the acidic TA domain that is derived from an alternative promoter and initiation codon in intron 3 (Yang et al., 1998). The 3' end of both TAp63 and ΔNp63 may be alternatively spliced to yield isoforms α, β, γ, and δ, while the ε-isoform is formed from transcriptional termination in exon 10 (Mangiulli et al., 2009). TAp63α and ΔNp63α contain a protein-protein interaction SAM domain and a trans-inhibitory domain, resulting from the masking of N-terminal TA domain residues. The δ- and ε-isoform proteins are formed by transcriptional termination in the second TA domain and after the OD, respectively (Mangiulli et al., 2009) (figure 1). Structure |
| Expression | TP63 expression is found in fetal and adult tissues, including the skin, cervix, vaginal epithelium, urothelium, prostate, heart, testis, kidney, thymus, brain, and spleen (Yang et al., 1998). Immunohistochemistry of p63 often shows strong nuclear-localized staining in basal epithelial cells. Additionally, TA and ΔN isoforms appear to be differentially expressed in particular tissue types. TAp63 variants are prevalent in the heart, testis, kidney, thymus, brain, and cerebellum. ΔNp63 transcripts are detected heavily in epithelial cells, kidney, spleen, and thymus, but not in the heart, liver, testis, or brain (Yang et al., 1998; Dötsch et al., 2010). |
| Localisation | As a transcription factor, p63 is normally present in the nucleus (Yang et al., 1998). |
| Function | TP63 acts as a motif-specific transcriptional activator or repressor, depending on the presence of TA or ID domains in the specific p63 isoform (Yang et al., 1998). It plays a critical role in the maintenance of progenitor-cell populations that encourage epithelial development and morphogenesis (Romano et al., 2009). ΔNp63, once thought to serve as a dominant negative regulator due to its lack of a full TA domain, has recently been implicated in transcriptionally activating and repressing target genes such as Keratin 5 and Keratin 14 to dictate early epithelial development and determine keratinocyte cell fate and lineage choices (Yang et al., 1998; Romano et al., 2009). Less is known about TAp63 function. Mice with germline deletion of TAp63 display blisters, decreased hair morphogenesis, and potential maintenance of adult stem cells, though full characterization of TAp63 function is lacking (Su et al., 2009). While the interactomes of TP53 and TP73 have been systematically analyzed and cataloged, until recently, no such information had been compiled for TP63 (Tozluoglu et al., 2008; Collavin et al., 2010). Recent protein chip analysis has elucidated 144 proteins that specifically interact with TP63 and are implicated in cell growth/death/survival, chromatin remodeling and gene regulation, RNA processing, protein trafficking and degradation, and other and epithelial differentiation (Huang et al., 2012). A representative protein and its function from each of the aforementioned categories are described below, while a complete list may be found in the supplemental data of Huang et al. (2012). Cell growth/survival: Signal Transducer and Activator of Transcription 3 (STAT3) - STAT3 is a latent cytoplasmic transcription factor activated in response to various interleukins and growth factors that binds the promoter regions of IL-6-induced plasma protein and intermediate-early genes (Akira et al., 1994; McLoughlin et al., 2005; Huang et al., 2012). Chromatin remodeling: SWI/SNF Regulator of Chromatin 1 (SMARCC1) - SMARCC1 is a component of the larger SWI/SNF complex responsible for chromatin remodeling necessary for transcriptional activation of certain genes (Wang et al., 1996; Ring et al., 1998; Huang et al., 2012). Gene regulation/expression: Eukaryotic Translation Initiation Factor 4A2 (EIF4A2) - EIF4A2 plays an important role in the binding of mRNA to the 43S pre-initiation complex during the beginning of protein synthesis (Sudo et al., 1995; Huang et al., 2012). RNA processing: Splicing Factor 3b, Subunit 4 (SF3B4) - SF3B4 interacts with other spliceosome proteins to help cross-link a 29-nucleotide region in the pre-mRNA near the branch-point sequence in the A complex (Champion-Arnaud and Reed, 1994; Huang et al., 2012). Protein trafficking: Trafficking Protein Particle Complex 2-Like (TRAPPC2L) - TRAPPC2L is part of the TRAPP multi-subunit tethering complex involved in intracellular vesicle trafficking (Scrivens et al., 2011; Huang et al., 2012). Protein degradation: Ubiquitin Conjugation Factor E4 B Isoform 1 (UFD2A) - UFD2A has been shown to promote monoubiquitination of p53 and, in combination with MDM2, to promote p53 polyubiquitination (Wu and Leng, 2011; Wu et al., 2011; Huang et al., 2012). Epithelial differentiation: Keratin 1 (KRT1) - KRT1 is a marker for terminal differentiation in the mammalian epidermis (Lessin et al., 1988; Huang et al., 2012). Through protein-protein interactions with other transcription and cofactors, TP63 also contributes to the transcriptional regulation of genes involved in cellular differentiation, proliferation/survival, growth suppression, apoptosis, adhesion, inflammation, and metabolism (Perez and Pietenpol, 2007; Viganò and Mantovani, 2007; Yang et al., 2011). Recent work by our laboratory has identified protein-protein interactions between ΔNp63α, TAp73, and c-REL that function to regulate key genes involved in growth arrest and apoptosis of mutant p53 head and neck squamous cell carcinoma (HNSCC) (Lu et al., 2011). Functionally important genes representing each of the aforementioned categories are described below, while more comprehensive reviews may be found in Perez and Pietenpol (2007) and Viganò and Mantovani (2007). Cellular differentiation: Jagged 1 (JAG1) - JAG1 is the ligand of the Notch receptor. It's binding causes a proteolytic cleavage cascade, leading to translocation of the intracellular component of the Notch receptor and subsequent activation of transcription factors with key roles in cell differentiation and morphogenesis (Gray et al., 1999; Sasaki et al., 2002; Guarnaccia et al., 2004). Overexpression of p63γ has been shown to dramatically upregulate JAG1 protein levels in colorectal cancer, osteogenic sarcoma, lung cancer, hepatocellular carcinoma, and glioma (Sasaki et al., 2002). Proliferation/survival: Epidermal Growth Factor Receptor (EGFR) - EGFR is the receptor for epidermal growth factor and is involved in modulating cellular functions such as cell proliferation, differentiation, and survival by activating various intracellular signaling cascades such as RAS and STAT that transcribe target genes important in cellular proliferation and survival (Carpenter, 1984; Jamnongjit et al., 2005; Testoni et al., 2006). Knockdown of ΔNp63α has been shown to reduce expression of EGFR in keratinocytes (Testoni et al., 2006). Growth suppression: Cyclin-Dependent Kinase Inhibitor 1A (CDKN1A) - CDKN1A (p21) associates with cyclins A, D, and E to prevent the G1-S phase transition in mammals (el-Deiry et al., 1993; Westfall et al., 2003). Overexpression of ΔNp63α has been shown to reduce expression of p21 in HEK cells (Westfall et al., 2003). Apoptosis: p53-Upregulated Modulator of Apoptosis (PUMA) - PUMA binds to BCL2 to induce rapid and profound apoptosis by cytochrome c release (Yu et al., 2001; Flores et al., 2002). Additionally, recent work has shown that a complex of ΔNp63α, with TAp73 or c-REL, can modify expression of key growth arrest and apoptotic genes such as p21WAF1, NOXA, and PUMA (Lu et al., 2011; Yang et al., 2011). Adhesion: Integrin Alpha 6 (ITGA6) - ITGA6 is a cell surface adhesion molecule that may help regulate migration and layer formation, especially in epithelial cells. Mouse models deficient in ITGA6 display severe blistering of the skin and other epithelia and die shortly after birth (Georges-Labouesse et al., 1996; Carroll et al., 2006). Loss of endogenous p63 in mammary epithelial cells has been shown to induce detachment and cell death, presumably because p63 regulates expression of key adhesion molecules such as ITGA6, ITGB1, ITGB4 other ECM components, and cadherins-catenins (Carroll et al., 2006; Yang et al., 2011). Inflammation: ΔNp63 overexpression has been observed in head and neck squamous cell carcinoma (HNSCC), which are associated with inflammation. TNF-α, a potent pro-inflammatory cytokine, promoted NF-κB, c-REL and RELA complexes with nuclear ΔNp63, to promote a broad-spectrum production of cytokines and chemokines (Lu et al., 2011; Yang et al., 2011). In addition, in squamous epithelia of ΔNp63α transgenic mice, severe inflammation, skin lesions and erythema were observed after ΔNp63 expression was induced. Microscopically, hyperplastic and hyperproliferative epidermis with diffuse infiltration of inflammatory cells in the dermis was observed (Yang et al., 2011). NF-κB family proteins, c-Rel and RelA, and numerous inflammatory cytokines and chemokines were significantly upregulated in ΔNp63 transgenic mice. Metabolism: Fatty Acid Synthase (FASN) - FASN catalyzes the conversion of Acetyl-CoA and Malonyl-CoA into long-chain saturated fatty acids with the help of NADPH (Wakil, 1989; D'Erchia et al., 2006). ΔNp63α (and TAp73α) expression has also been shown to induce promoter and enhancer activity in human FASN gene by binding to p53 response elements (D'Erchia et al., 2006). Mouse models TP63 knockout mice are born alive but have striking developmental defects including absent or truncated limbs, lack of stratified epithelia, and lack hair follicles, teeth, and mammary glands. Thus, TP63 is essential for epidermal-mesenchymal interactions during embryonic development, including regenerative limb proliferation, craniofacial and epithelial development, and differentiation of squamous epithelia (Yang et al., 1998; Mills et al., 1999; McKeon, 2004; Laurikkala et al., 2006). Recently, ΔNp63α transgenic mice have been developed using tissue-specific tetracycline inducible expression. Mice expressing ΔNp63α under a tissue-specific promoter (SPC) for lung epithelium exhibited Keratin 5 and 14 induction, trans-differentiation to an epidermal cell lineage, and squamous metaplasia. Overexpression of ΔNp63α under a K5 promoter in wild-type epidermis results in severe defects in hair follicle development and cycling, leading to severe hair loss and a depleted hair follicle stem-cell niche (Romano et al., 2009; Romano et al., 2010). In addition, ΔNp63α overexpression induced marked skin inflammation, and skin hyperplasia (Yang et al., 2011). A more detailed summary of the phenotypes of different p63 knockout and transgenic mouse models has recently been published (Vanbokhoven et al., 2011). |
| Homology | In addition to humans, the TP63 gene is conserved in chimpanzees, dogs, cows, mice, rats, chicken, and zebrafish, and evolutionary precursors have been detected in Cnidarians. |
| Implicated in |
| Entity | Various cancers |
| Note | Genome-wide association studies and in vivo work have identified TP63 mutations and/or overexpression in multiple cancers, including lung, bladder, esophageal, and head and neck squamous cell carcinoma (Rocco et al., 2006; Rothman et al., 2010; Hu et al., 2011; Stransky et al., 2011; Yang et al., 2011; Ellinghaus et al., 2012). While these studies have correlated certain mutations with an increased risk for cancer, the molecular effects of these mutations are not as well characterized as those in the aforementioned autosomal dominant disorders. Immunohistochemistry (IHC) in head and neck squamous cell carcinoma (HNSCC) has identified overexpression of TP63 isoforms in the majority of tumor specimens. Although the tumorigenic effect of all the TP63 isoforms has yet to be fully understood, unregulated TP63 expression is an early pathogenic event in HNSCC and inhibition of TP63 can induce apoptotic cell death (Westfall and Pietenpol, 2004; Chen et al., 2005; Rocco et al., 2006). Additionally, ΔNp63α has been shown to increase the half-life of hypoxia-inducible factor 1α, leading to upregulation of vascular endothelial growth factor (VEGF) expression in vitro in human non-small cell carcinoma cell lines (Senoo et al., 2002). Transcriptional activation of matrix metalloproteases (MMPs) has also been seen with high levels of ΔNp63α (Patturajan et al., 2002; Hildesheim et al., 2004). TAp73/ΔNp63α interaction has also been shown to mediate chemosensitivity to cisplatin in primary breast cancers (Leong et al., 2007). More recently, ΔNp63 overexpression is shown in HNSCC to correlate with increased epithelial inflammation, proliferation, and migration by regulating gene programs important in cancer progression (Yang et al., 2011). In addition, TNF-α, a potent pro-inflammatory cytokine, promoted c-REL translocation and complexes with nuclear ΔNp63, while TAp73 dissociated from ΔNp63 and the promoters of key growth arrest and apoptosis genes p21CIP1/WAF1, NOXA, and PUMA. Increased nuclear ΔNp63α was detected in human HNSCC tumors, and hyperplastic squamous epithelia of transgenic mice overexpressing ΔNp63α (Lu et al., 2011). Such a novel mechanism explains how inflammation activates proto-oncogenic NF-κB and overcomes TP53/p63/p73 family mediated tumor suppression. Furthermore, it has been found that ΔNp63α interacts with IκB kinases, and IKKβ promotes ubiquitin-mediated proteasomal degradation of ΔNp63α. Conversely, IKKβ inhibition attenuated cytokine- or chemotherapy-induced degradation of ΔNp63α (Chatterjee et al., 2010). |
| Entity | Acro-dermato-ungual-lacrimal-tooth (ADULT) syndrome |
| Note | ADULT syndrome may be caused by heterozygous mutations in the TP63 gene, including missense mutations R298Q and R227Q. Features include ectrodactyly, syndactyly, finger and toenail dysplasia, hypoplastic breasts and nipples, freckling, lacrimal duct atresia, frontal alopecia, primary hypodontia, and loss of permanent teeth (Reisler et al., 2006; Rinne et al., 2006). |
| Entity | Ectrodactyly, ectodermal dysplasia, and cleft lip/palate syndrome 3 (EEC3) |
| Note | EEC3 is an autosomal dominant disorder caused by a heterozygous mutation in TP63, most likely in the DNA-binding domain. Clinically, EEC3 presents with absence of the central parts of the hands and feet, resulting in split-hand/foot malformations, ectodermal dysplasia, and cleft lip that may or may not include cleft palate (Maas et al., 1996; Akahoshi et al., 2003). |
| Entity | Hay-Wells syndrome |
| Note | While similar to phenotype to ADULT syndrome and EEC3, Hay-Wells syndrome is caused by a heterozygous mutation in TP63 in the sterile alpha motif (SAM) domain. Hay-Wells Syndrome is characterized by congenital ectodermal dysplasia with course, sparse hair, dystrophic nails, scalp infections, hypodontia, maxillary hypoplasia, and cleft lip/palate (Hay and Wells, 1976; McGrath et al., 2001). |
| Entity | Limb-mammary syndrome (LMS) |
| Note | LMS is caused by a heterozygous mutation in the TP63 gene and is allelic to ADULT syndrome. Features of LMS include severe hand/food anomalies and hypoplasia/aplasia of the mammary gland and nipples (Propping and Zerres, 1993; van Bokhoven et al., 2001). |
| To be noted |
| Acknowledgements: supported by NIDCD Intramural Project ZIA-DC-000073 and 74. |
| External links |
| Bibliography |
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| Contributor(s) |
| Written | 12-2012 | Austin Mattox, Zhong Chen, Carter Van Waes |
| Clinical Genomics Unit and Tumor Biology Section, Head and Neck Surgery Branch, National Institute on Deafness and Other Communication Disorders, NIH, Bethesda, MD, 20892, USA |
| Citation |
| This paper should be referenced as such : |
| Mattox A, Chen Z, Van Waes C . TP63 (tumor protein p63). Atlas Genet Cytogenet Oncol Haematol. December 2012 . |
| URL : http://AtlasGeneticsOncology.org/Genes/TP63ID365ch3q27.html |
The various updated versions of this paper are referenced and archived by INIST as such : |
| © Atlas of Genetics and Cytogenetics in Oncology and Haematology | indexed on : Fri Apr 18 17:42:02 CEST 2014 |
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