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The DOI matches its Crossref record; 164 of the 164 references it cites were found in a registry or an index; 2 of the 148 sources its claims cite were checked for support.

The TP53 tumor suppressor gene: From molecular biology to clinical investigations

Open access
Baliakas, Panagiotis, Soussi, Thierry·2025·Journal of Internal Medicine

Abstract

Extensively studied over the past four decades, the TP53 gene has emerged as a pivotal watchman in cellular defense and a key factor in cancer biology. TP53 is the most frequently mutated gene in human malignancies, 50% of which carry alterations to it. Initially, the functions of p53 were thought to be restricted to cell‐cycle arrest and apoptosis. With time, however, a growing number of functions have been discovered, illustrating p53's role as a master switch between any cellular stress and cellular or multicellular responses that contribute to its anti‐tumor activity. Indeed, the peculiar landscape of TP53 mutations and its high heterogeneity are linked both to the structure of the protein and its ubiquitous function in regulating cellular homeostasis. Mutations in p53 are associated with poor response to therapy and shorter survival in most cancer types, and the diagnosis of p53 mutations is currently used to improve case management in some types of leukemia and lymphoma. Although TP53 has been defined as a tumor suppressor gene, overexpressed mutated p53 variants found in human tumors are defined as dominant oncogenes with a potential gain of function, which makes the gene a very attractive target for developing new cancer treatments. Beyond its role in cancer, our review also highlights TP53's significance in non‐neoplastic conditions, such as bone marrow failure syndromes and certain developmental disorders, where chronic p53 activation plays a crucial role in cellular stress responses, demonstrating its broader biological importance.

Overview

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TL;DR

TP53 is the most frequently mutated gene in human cancer, with roughly 50% of malignancies carrying an alteration, and it acts as a context-dependent transcription factor whose loss or mutation promotes therapy resistance and poor survival. This review synthesizes p53 molecular biology, variant heterogeneity, clinical associations, germline syndromes, and therapeutic strategies, while noting that clinical translation remains limited and p53 is still considered largely undruggable.

Key findings

  • TP53 alterations occur in an estimated 50% of human cancers; frequency is highly heterogeneous, from a few percent in thyroid cancer to about 30% in breast cancer and nearly 100% in high-grade serous ovarian cancer or small cell lung cancer.
  • TP53 mutations are associated with poor response to therapy and shorter survival in most cancer types, with clinical applications established mainly in chronic lymphocytic leukemia (CLL) and acute myeloid leukemia (AML); in mantle cell lymphoma, updated NCCN guidelines recommend TP53 sequencing before treatment.
  • p53 regulates cell-cycle arrest, apoptosis, DNA repair, autophagy, senescence, immunity, and the p53-p21 DREAM pathway; mutant p53 may exert dominant-negative and proposed gain-of-function effects, but recent isogenic models challenge gain of function and emphasize loss of function and dominant-negative effects.
  • Germline TP53 mutations cause Li-Fraumeni syndrome, and surveillance (Toronto protocol) has been shown to improve survival; the Brazilian founder variant p.R337H is found in 0.3% of the general southern and southeastern Brazilian population. Non-neoplastic phenotypes, including inherited bone marrow failure syndromes and developmental disorders, can arise from chronic p53 activation.

Methods

  • Design: narrative review by two authors, covering p53 molecular biology, TP53 mutation heterogeneity, clinical associations, germline mutations, polymorphisms, non-neoplastic syndromes, and therapeutic targeting.
  • Data/sample: no primary cohort or systematic search is described; the review cites a literature base including more than 120,000 articles, 13,000 reviews, 500 meta-analyses, sequencing of several hundred thousand tumors, and description of 250,000 mutations, plus TCGA (11,000 cases) and ICGC (25,000 cases) sequencing projects.
  • Analysis: thematic synthesis of published mechanistic, structural, murine-model, genomic, and clinical studies, with selected figures summarizing mutation frequency, p53 domains, signaling, and therapeutic strategies.

Limitations

  • The authors state the field is too broad to cover fully and refer readers to other reviews for TP53 isoforms, p63/p73, therapeutic strategies, and detailed p53 pathways; they also state that clinical applications of TP53 findings remain restricted to a few cancer types and that p53 is still considered undruggable.
  • The authors state that the clinical relevance of the dominant-negative effect remains to be established, that gain-of-function findings have been challenged by more recent isogenic models, and that p53 gene-expression signatures are not currently pertinent for clinic use.
  • Evident from the text: as a narrative review, it does not describe a systematic search strategy, inclusion criteria, or formal quality appraisal, so the selection and weighting of cited evidence are author-dependent.

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Integrity signals

Registry

Crossref · 10.1111/joim.20106

Cites

164 of 164 references verified0 citation errors · 0 not checkable

Statistics

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Figures

Fig. 1 TP53 mutation in human cancer: (a) worldwide cancer burden (new cases and number of deaths, Globocan 2022) and average TP53 mutation frequency in the 14 most frequent cancers. * In cervical cancer, loss of TP53 function occurs by interaction with the E6 protein of oncogenic human papilloma viruses. (b) Schema showing the domain structure of the p53 protein, including the transactivation domains (TAD 1 and 2), the proline‐rich domain (PRD), the DNA‐binding domain (DBD), the tetramerization domain (TET), and the negative regulatory domain (NEG‐REG). The aligned graphs indicate the relative frequency of mutations across different domains of p53. The DNA‐binding domain is the most frequent location for p53 mutations, according to the UMD_TP53 database. High‐penetrant p53 variants can be either structural or contact variants, depending on the function of the residue. In contrast, residue association with p53 multimerization shows a lower penetrance with only a partial activity loss. (c) X‐ray structure of p53 DBD showing locations of the most frequent mutations. DNA contact variants at positions 280, 248, or 273 are localized in the vicinity of the DNA molecules, whereas structural variants (175 or 220) are buried inside the molecule (taken from [8]).
Fig. 1 TP53 mutation in human cancer: (a) worldwide cancer burden (new cases and number of deaths, Globocan 2022) and average TP53 mutation frequency in the 14 most frequent cancers. * In cervical cancer, loss of TP53 function occurs by interaction with the E6 protein of oncogenic human papilloma viruses. (b) Schema showing the domain structure of the p53 protein, including the transactivation domains (TAD 1 and 2), the proline‐rich domain (PRD), the DNA‐binding domain (DBD), the tetramerization domain (TET), and the negative regulatory domain (NEG‐REG). The aligned graphs indicate the relative frequency of mutations across different domains of p53. The DNA‐binding domain is the most frequent location for p53 mutations, according to the UMD_TP53 database. High‐penetrant p53 variants can be either structural or contact variants, depending on the function of the residue. In contrast, residue association with p53 multimerization shows a lower penetrance with only a partial activity loss. (c) X‐ray structure of p53 DBD showing locations of the most frequent mutations. DNA contact variants at positions 280, 248, or 273 are localized in the vicinity of the DNA molecules, whereas structural variants (175 or 220) are buried inside the molecule (taken from [8]).CC BY-NC-ND · PubMed Central
Fig. 2 p53 signaling pathways. Without stress, the MDM2/MDMx complex ubiquitinates p53, leading to its subsequent destruction by the 26S proteasome. Upon various types of stress, multiple pathways prevent p53 degradation and activate p53, which will accumulate in the cell nucleus to orchestrate an adequate transcriptional response according to the type of stress.
Fig. 2 p53 signaling pathways. Without stress, the MDM2/MDMx complex ubiquitinates p53, leading to its subsequent destruction by the 26S proteasome. Upon various types of stress, multiple pathways prevent p53 degradation and activate p53, which will accumulate in the cell nucleus to orchestrate an adequate transcriptional response according to the type of stress.CC BY-NC-ND · PubMed Central
Fig. 3 The dual function of p21 in response to p53 activation. (a) In the “classical” pathway, cell cycle progression requires hypophosphorylation of RB to prevent binding to E2F transcription factors and form a repressive complex that block the expression of genes required for DNA replication and S‐phase entry. Expression of p21 prevents RB phosphorylation, leaving RB complexed with E2F factors and histone deacetylases (HDAC) to maintain a repressive chromatin state and block S‐phase gene expression. (b) In the p53‐p21 DREAM pathway, multiple genes associated with cell cycle regulation or DNA repair are indirectly negatively regulated by p53 via RB hypophosphorylation. CDK, cyclin dependent kinase.
Fig. 3 The dual function of p21 in response to p53 activation. (a) In the “classical” pathway, cell cycle progression requires hypophosphorylation of RB to prevent binding to E2F transcription factors and form a repressive complex that block the expression of genes required for DNA replication and S‐phase entry. Expression of p21 prevents RB phosphorylation, leaving RB complexed with E2F factors and histone deacetylases (HDAC) to maintain a repressive chromatin state and block S‐phase gene expression. (b) In the p53‐p21 DREAM pathway, multiple genes associated with cell cycle regulation or DNA repair are indirectly negatively regulated by p53 via RB hypophosphorylation. CDK, cyclin dependent kinase.CC BY-NC-ND · PubMed Central
Fig. 4 Deregulation of the p53 network in cancer cells. Dysfunctional p53 will not bind to the response element localized in the promoters of all p53‐regulated genes, including p21. Impairing this transcriptional pathway (left part of the Fig.) prevents the activation of the various p53 response genes. Lack of p21 induction also impairs the DREAM pathway (right part of the Fig.), leaving multiple genes repressed by the DREAM complex, as shown in Fig. 3.
Fig. 4 Deregulation of the p53 network in cancer cells. Dysfunctional p53 will not bind to the response element localized in the promoters of all p53‐regulated genes, including p21. Impairing this transcriptional pathway (left part of the Fig.) prevents the activation of the various p53 response genes. Lack of p21 induction also impairs the DREAM pathway (right part of the Fig.), leaving multiple genes repressed by the DREAM complex, as shown in Fig. 3.CC BY-NC-ND · PubMed Central
Fig. 5 Increased activation of p53 can lead to bone marrow failure syndrome and leukemia. (a) Multiple chronic cellular stresses may result in the persistent activation of p53, causing disruption of cellular homeostasis and aplasia. Although some organs can tolerate this, others, such as hematopoietic stem cells (HSC), will be deprived of specific cellular lineages. (b) In certain diseases, somatic gene rescue, such as p53 mutation, can mitigate the cellular response induced by stress but carries a risk of leading to cancer.
Fig. 5 Increased activation of p53 can lead to bone marrow failure syndrome and leukemia. (a) Multiple chronic cellular stresses may result in the persistent activation of p53, causing disruption of cellular homeostasis and aplasia. Although some organs can tolerate this, others, such as hematopoietic stem cells (HSC), will be deprived of specific cellular lineages. (b) In certain diseases, somatic gene rescue, such as p53 mutation, can mitigate the cellular response induced by stress but carries a risk of leading to cancer.CC BY-NC-ND · PubMed Central
Fig. 6 Strategies for targeting p53 in human cancer. ATO, arsenic trioxide.
Fig. 6 Strategies for targeting p53 in human cancer. ATO, arsenic trioxide.CC BY-NC-ND · PubMed Central

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Metadata

Authors
Baliakas, P., & Soussi, T.
Affiliations
Uppsala University (SE)
Corresponding author
Soussi, Thierry
Venue
Journal of Internal Medicine
Publisher
Wiley
Published
2025-06-16
Volume
298
Issue
2
Pages
78-96
ISSN
  • 0954-6820 (ISSN-L)
  • 1365-2796
OpenAlex
W4411388612
Cited by
50
References
164
Citations by year
2026: 37 · 2025: 13
FWCI
4.99
Type
journal article
Language
en
Open access
Locations
  • Journal of Internal Medicine (publishedVersion, cc-by-nc-nd)
  • PubMed (publishedVersion)
  • PubMed Central (publishedVersion, cc-by-nc-nd)
  • Diva portal (Dalarna University Library) (submittedVersion, other-oa)
Funders
  • Institut National de la Santé et de la Recherche Médicale
  • Conseil Régional, Île-de-France
Topics
  • Health Sciences › Medicine › Oncology › Cancer-related Molecular Pathways
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Cell death mechanisms and regulation
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › PI3K/AKT/mTOR signaling in cancer
Keywords
TP53, p53, tumor suppressor, TP53 mutation, gain-of-function p53, cell cycle arrest, apoptosis, cellular stress response, treatment resistance, leukemia, lymphoma, bone marrow failure syndromes, developmental disorders, cancer therapy targets
MeSH terms
Humans, Mutation, Neoplasms, Genes, Tumor Suppressor, Genes, p53, Tumor Suppressor Protein p53

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