Mutant p53: it's not all one and the same.

Area of Science:

• Oncology
• Molecular Biology
• Genetics

Background:

• TP53 tumor suppressor gene mutations are the most frequent genetic alterations in human cancers.
• Over 1000 TP53 alleles have been identified, with missense mutations prompting extensive research into mutant p53 protein functions.
• Mutant TP53 proteins can impair wild-type p53 activity, act as dominant-negative inhibitors, or gain new oncogenic functions.

Purpose of the Study:

• To review the current understanding of TP53 allele variation in cancer.
• To discuss evidence supporting and challenging the gain-of-function (GOF) hypothesis for mutant p53.
• To explore how systematic profiling of TP53 mutations can clarify their roles as cancer drivers.

Main Methods:

• Review of existing research on TP53 mutations and their functional consequences.
• Analysis of studies investigating the dominant-negative (DN) and gain-of-function (GOF) models of mutant p53.
• Discussion of emerging systematic approaches for TP53 mutation profiling.

Main Results:

• TP53 mutations impact cancer through loss of wild-type function, dominant-negative inhibition, or gain of oncogenic functions.
• The gain-of-function (GOF) hypothesis for mutant p53 is supported by diverse attributed biological functions but remains controversial.
• Systematic profiling of TP53 mutations is crucial for understanding their distinct roles in cancer progression.

Conclusions:

• Understanding TP53 allele variation is key to deciphering cancer drivers.
• Further research may reveal phenotypic uniqueness in tumors with distinct TP53 mutations.
• This knowledge could enable targeted therapies and improved patient stratification for TP53-mutant cancers.