TP53 (Tumor Protein P53) - GeneticArchaelogy

Overview

TP53 encodes the p53 protein, one of the most important tumor suppressors, often referred to as the “guardian of the genome.” It plays a central role in cancer prevention.

📍 Chromosomal Position

17p13.1 (Chromosome 17)

🧬 Gene Category

Tumor Suppressor

🔬 Inheritance

Autosomal dominant

📊 Prevalence

Mutations in over 50% of all tumors

Function & Significance

The p53 protein plays a central role in cancer prevention through:

Cell Cycle Regulation – Stops cell division when DNA damage occurs
Induction of Apoptosis – Initiates programmed cell death for irreparable damage
Maintenance of Genomic Stability – Prevents the passing on of mutations

🏆 Scientific Significance

TP53 is the most frequently mutated gene in human cancers. The discovery of its function was a milestone in cancer research and led to numerous scientific awards.

Associated Diseases

🎗️ Li-Fraumeni Syndrome

Rare hereditary cancer predisposition with a high risk for multiple tumors
🎗️ Breast Cancer

Increased risk, especially at a young age
🎗️ Osteosarcoma

Bone cancer, common in children and adolescents
🎗️ Soft Tissue Sarcomas

Various types of connective tissue tumors
🎗️ Leukemia & Brain Tumors

Increased risk for various blood and brain cancers

Clinical Relevance

⚕️ Genetic Testing

TP53 testing is recommended in cases of:

Suspicion of Li-Fraumeni Syndrome
Multiple cancer cases in the family
Cancer diagnosis at a very young age
Unusual tumor patterns

💊 Monitoring & Management

For TP53 mutation carriers:

Comprehensive tumor screening protocol
Regular whole-body MRI examinations
Avoidance of unnecessary radiation exposure
Genetic counseling for family members

🧬 Relevant SNPs

Key pathogenic variants in TP53 (Li-Fraumeni Syndrome):

rs28934576
17:7675088

Allele 1

Allele 2

Significance: R248W – a common hotspot mutation in TP53. Leads to loss of function of the p53 protein and a significantly increased cancer risk.

rs121913343
17:7674220

Allele 1

Allele 2

Significance: R175H – one of the most frequent TP53 mutations. Associated with Li-Fraumeni Syndrome and multiple cancer types.

⚕️ Li-Fraumeni Syndrome

Germline mutations in TP53 cause Li-Fraumeni Syndrome characterized by:

Very High Cancer Risk: Up to 90% lifetime risk
Early Onset: Often before the age of 30
Multiple Cancer Types: Breast cancer, soft tissue sarcomas, osteosarcomas, leukemia, brain tumors
Familial Clustering: Multiple cancer cases within the family

Management: Intensified early detection starting in childhood, genetic counseling, and avoidance of ionizing radiation.

📚 Data Sources

The information on this page is based on the following scientific sources:

OMIM: #191170 – Online Mendelian Inheritance in Man
IARC TP53 Database: International Agency for Research on Cancer
dbSNP: rs28934576, rs11540652 – SNP Database (NCBI)
ClinVar: Clinical Variant Database (NCBI)
PubMed: Li-Fraumeni Syndrome Research

Last Update: February 2026

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TP53