A Systematic p53 Mutation Library Links Differential Functional Impact to Cancer Mutation Pattern and Evolutionary...

Area of Science:

• Oncology
• Molecular Biology
• Genetics

Background:

• The TP53 gene is frequently mutated in human cancers.
• Research has primarily focused on six hotspot codons, representing only ~30% of p53 mutations.
• A comprehensive understanding of the full p53 mutation spectrum's impact is lacking.

Purpose of the Study:

• To systematically characterize the functional consequences of a broad spectrum of TP53 mutations.
• To investigate the differential outcomes of p53 variants in human cells and in vivo.
• To elucidate evolutionary selective pressures and identify gain-of-function mutations in p53.

Main Methods:

• Creation of a synthetically designed library of ~10,000 TP53 DNA-binding domain (DBD) variants.
• Functional assessment of p53 variants in human cell culture.
• In vivo functional evaluation of p53 variants.

Main Results:

• TP53 mutations exhibit differential functional outcomes in patients.
• Selective pressures driving p53 conservation throughout evolution were elucidated.
• Loss of anti-proliferative function generally correlates with cancer-associated mutations.
• Evidence suggests selective gain-of-function mutations may be favored in vivo.
• TP53 single nucleotide polymorphisms (SNPs), when combined with other mutations, can modulate tumor progression.

Conclusions:

• The p53 mutation landscape is more complex than previously understood, with diverse functional consequences.
• Gain-of-function mechanisms and the impact of seemingly neutral variants contribute to cancer progression.
• This comprehensive analysis provides critical insights into TP53 mutation impact and evolutionary selection.