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Yeast As a Chassis for Developing Functional Assays to Study Human P53
14:57

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

Published on: August 4, 2019

Role of the newer p53 family proteins in malignancy

M S Irwin1, W G Kaelin

  • 1Dana Farber Cancer Institute, Dept. of Adult Oncology, and Harvard Medical School, Boston, MA 02115, USA.

Apoptosis : an International Journal on Programmed Cell Death
|April 26, 2001
PubMed

Insights

The p53 family includes p63 and p73, which share similarities but have distinct functions and signaling pathways. Unlike p53, p63 and p73 are not classical tumor suppressors and are linked to developmental abnormalities.

Area of Science:

  • Molecular Biology
  • Genetics
  • Cancer Research

Background:

  • The p53 family comprises p53, p63, and p73, with p63 and p73 being the most recently identified members.
  • p63 and p73 share structural and functional similarities with p53, including DNA binding and apoptosis induction.
  • However, significant differences exist in their protein isoforms, upstream signaling, and regulation by DNA damage and cellular differentiation.

Purpose of the Study:

  • To delineate the similarities and differences between p53, p63, and p73.
  • To investigate the distinct roles of p63 and p73 in cellular processes and disease.
  • To clarify the non-classical tumor suppressor nature of p63 and p73.

Main Methods:

  • Comparative analysis of protein structure and function.
  • Investigation of DNA binding and transactivation capabilities.
  • Examination of upstream signaling pathways and regulation by cellular differentiation.
  • Analysis of mutation prevalence in human cancers and knockout mouse models.

Main Results:

  • p63 and p73 generate multiple protein isoforms with varying functions.
  • Their activation pathways differ from p53, and they are not universally induced by DNA damaging agents.
  • p63 and p73 mutations are rare in cancers, unlike p53 mutations.
  • Mice lacking p63/p73 exhibit developmental abnormalities, not tumors.
  • p63 mutations are linked to ectodermal dysplastic syndromes.

Conclusions:

  • p63 and p73 are distinct from p53, functioning beyond classical tumor suppression.
  • Their roles in development and potential involvement in cancer may be linked to isoform-specific expression.
  • Further research is needed to understand the clinical significance of p63 and p73 isoform regulation in human cancers.

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