Molecules and Cells

Korean Society for Molecular and Cellular Biology (한국분자세포생물학회)
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Role of RUNX Family Members in G1 Restriction-Point Regulation

  • Lee, Jung-Won (Department of Biochemistry, College of Medicine, Chungbuk National University) ;
  • Bae, Suk-Chul (Department of Biochemistry, College of Medicine, Chungbuk National University)
  • Received : 2019.12.20
  • Accepted : 2019.12.20
  • Published : 2020.02.29
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Abstract

When cells are stimulated by growth factors, they make a critical choice in early G1 phase: proceed forward to S phase, remain in G1, or revert to G0 phase. Once the critical decision is made, cells execute a fixed program independently of extracellular signals. The specific stage at which the critical decision is made is called the restriction point or R-point. The existence of the R-point raises a major question: what is the nature of the molecular machinery that decides whether or not a cell in G1 will continue to advance through the cell cycle or exit from the cell cycle? The R-point program is perturbed in nearly all cancer cells. Therefore, exploring the nature of the R-point decision-making machinery will provide insight into how cells consult extracellular signals and intracellular status to make an appropriate R-point decision, as well into the development of cancers. Recent studies have shown that expression of a number of immediate early genes is associated with the R-point decision, and that the decision-making program constitutes an oncogene surveillance mechanism. In this review, we briefly summarize recent findings regarding the mechanisms underlying the context-dependent R-point decision.

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References

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