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Updated: Nov 4, 2025

Yeast As a Chassis for Developing Functional Assays to Study Human P53

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Published on: August 4, 2019

p53 Frameshift Mutations Couple Loss-of-Function with Unique Neomorphic Activities.

David R Tong¹, Wen Zhou¹, Chen Katz¹

¹Department of Biological Sciences, Columbia University, New York, New York.

Molecular Cancer Research : MCR

|May 28, 2021

Summary

This summary is machine-generated.

p53 frameshift mutants, often found in cancer, show altered functions. One mutant retains some antiproliferative activity and induces senescence, offering potential therapeutic targets.

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Area of Science:

Molecular Biology
Cancer Research
Genetics

Background:

p53 mutations are common in cancer, often leading to loss of transcriptional activity.
Frameshift mutations in the TP53 gene can produce truncated p53 proteins with altered properties.

Purpose of the Study:

To characterize p53 frameshift mutant proteins expressed from endogenous TP53 locus.
To investigate the functional consequences of these mutants in cancer cell lines.

Main Methods:

Analysis of p53 frameshift mutants in U2OS osteosarcoma and HCT116 colorectal cancer cell lines.
Assessment of DNA-binding, oligomerization, transcriptional activity, and cellular functions (proliferation, senescence, migration).

Main Results:

Three p53 frameshift mutants were characterized, retaining intact DNA-binding domains but showing altered oligomerization.
Mutants were transcriptionally inactive, unable to initiate wild-type p53 programs.
One mutant, I332fs*14, exhibited residual antiproliferative activity, induced senescence, and decreased cell motility.

Conclusions:

p53 frameshift mutants display a mix of loss-of-gain and gain-of-function characteristics.
These variants differ from both wild-type p53 and complete p53 loss.
The residual and neomorphic functions of p53 frameshift mutants may be targets for novel cancer therapies.