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PTEN Controls the DNA Replication Process through MCM2 in Response to Replicative Stress

Jiawen Feng1, Jing Liang1, Jiaju Li1

  • 1Institute of Systems Biomedicine, Center for Molecular and Translational Medicine, Department of Pathology, School of Basic Medicine, Peking-Tsinghua Center for Life Sciences, Peking University Health Science Center, Beijing 100191, PRC.

Cell Reports
|November 10, 2015
PubMed

Insights

The tumor suppressor PTEN dephosphorylates MCM2, restricting DNA replication fork progression. Loss of PTEN function causes replication defects and genomic instability, highlighting PTEN

Area of Science:

  • Molecular Biology
  • Cancer Biology
  • Genetics

Background:

  • PTEN is a critical tumor suppressor frequently altered in human cancers.
  • Nuclear PTEN plays a role in genome maintenance.
  • The phosphatidylinositol 3-kinase (PI3K)-AKT pathway is a key signaling cascade regulated by PTEN.

Purpose of the Study:

  • To investigate the role of PTEN in regulating DNA replication.
  • To identify novel PTEN interacting partners involved in DNA replication.
  • To elucidate the mechanism by which PTEN maintains genomic stability.

Main Methods:

  • Co-immunoprecipitation to identify PTEN-interacting proteins.
  • In vitro kinase assays to assess PTEN's dephosphorylation activity.
  • Analysis of DNA replication fork progression under replicative stress.
  • Assessment of chromosomal aberrations in PTEN-deficient cells.

Main Results:

  • PTEN physically associates with minichromosome maintenance complex component 2 (MCM2).
  • PTEN dephosphorylates MCM2 at serine 41 (S41), restricting replication fork progression.
  • PTEN deficiency leads to unrestrained replication fork progression and increased chromosomal aberrations.
  • Cells expressing a phosphomimic MCM2 mutant (S41D) phenocopy PTEN disruption.

Conclusions:

  • PTEN regulates DNA replication through direct interaction and dephosphorylation of MCM2.
  • PTEN is essential for preventing replication defects and maintaining genomic stability under stress.
  • This study reveals a novel mechanism for PTEN's tumor suppressor activity involving MCM2 and DNA replication.

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