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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

The combined status of ATM and p53 link tumor development with therapeutic response

Hai Jiang1, H Christian Reinhardt, Jirina Bartkova

  • 1The Koch Institute for Integrative Cancer Research at Massachusetts Institute of Technology, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.

Genes & Development
|July 18, 2009
PubMed

Insights

Tumor suppressor gene alterations, like ATM and p53, dictate chemotherapy response. Targeting DNA-PKcs can resensitize chemoresistant ATM-deficient tumors to DNA-damaging agents.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cancer Genetics

Background:

  • Tumor suppressor networks are crucial in cancer development.
  • Understanding how network alterations impact anti-cancer treatment response is unclear.
  • Common tumor mechanisms bypassing checkpoints influence treatment outcomes.

Purpose of the Study:

  • To investigate how tumor suppressor network alterations predict chemotherapy response.
  • To identify tumor-specific vulnerabilities for targeted therapies.
  • To evaluate the combined status of ATM and p53 in predicting response to genotoxic chemotherapies.

Main Methods:

  • Analysis of ATM and p53 gene status in tumors.
  • Assessment of tumor response to DNA-damaging chemotherapy under varying ATM/p53 conditions.
  • Investigation of DNA-PKcs dependency in ATM-deficient cancer cells.
  • In vivo studies of DNA-PKcs suppression in chemoresistant tumors.

Main Results:

  • Combined ATM and p53 status predicts response to genotoxic chemotherapy.
  • ATM suppression sensitizes p53-deficient tumors to chemotherapy.
  • Functional p53 with ATM or Chk2 suppression confers resistance to genotoxic agents.
  • ATM-deficient cells show addiction to DNA-PKcs for DNA damage survival.
  • DNA-PKcs suppression resensitizes chemoresistant ATM-deficient tumors to chemotherapy.

Conclusions:

  • Tumor development alterations dominantly influence chemotherapy response.
  • Specific genetic alterations create vulnerabilities exploitable by targeted therapies.
  • The interplay between ATM, p53, and DNA-PKcs is critical for therapeutic strategies.

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