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CIP2A coordinates phosphosignaling, mitosis, and the DNA damage response.

Srikar Nagelli1, Jukka Westermarck2

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Trends in Cancer
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The oncoprotein CIP2A coordinates cancer cell signaling, mitosis, and DNA damage survival. CIP2A is crucial for DNA-damaged cells entering mitosis and a target for cancer therapies.

Keywords:
G2/M arrestPLK1RAD51TNBCchromothripsis

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Area of Science:

  • Oncology
  • Molecular Biology
  • Cell Biology

Background:

  • Human cancers exhibit shared dependencies on signaling pathways, mitotic activity, and DNA damage response.
  • The oncoprotein CIP2A (cancerous inhibitor of protein phosphatase 2A) plays a central role in regulating these cancer cell characteristics.

Purpose of the Study:

  • To elucidate the mechanisms by which CIP2A coordinates cancer cell signaling, mitosis, and DNA damage survival.
  • To investigate the role of the CIP2A-TopBP1 complex in DNA repair and chromosomal stability.
  • To highlight the clinical significance of CIP2A as a disease driver and therapeutic target, particularly in basal-like triple-negative breast cancer (BL-TNBC).

Main Methods:

  • Investigating CIP2A's role in controlling cancer cell phosphoproteomes through inhibition of protein phosphatase 2A (PP2A).
  • Analyzing the direct interaction between CIP2A and the DNA damage response protein TopBP1 (topoisomerase II-binding protein 1).
  • Assessing CIP2A's essentiality in mitotic cells with defects in homologous recombination (HR) DNA repair, such as BRCA mutants.

Main Results:

  • CIP2A regulates cancer cell phosphoproteomes by inhibiting PP2A.
  • CIP2A directly interacts with TopBP1, facilitating the entry of DNA-damaged cells into mitosis.
  • The CIP2A-TopBP1 complex is vital for clustering fragmented chromosomes during mitosis and is essential for HR-defective cancer cells.
  • CIP2A is identified as a key driver in basal-like triple-negative breast cancer (BL-TNBC).

Conclusions:

  • CIP2A is a critical regulator coordinating key cancer cell processes including signaling, mitosis, and DNA damage response.
  • The CIP2A-TopBP1 interaction is essential for maintaining genomic stability, particularly in cancers with compromised DNA repair pathways.
  • CIP2A represents a significant therapeutic target for a broad spectrum of cancers, including BL-TNBC.