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Updated: Nov 1, 2025

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CDK4: Linking cell size to cell cycle control

Yiqin Ma1, Bruce A Edgar1

  • 1Department of Oncological Sciences, Huntsman Cancer Institute, University of Utah, Salt Lake City, UT, USA.

Developmental Cell
|June 22, 2021
PubMed

Insights

A study reveals cyclin-dependent kinase 4 (CDK4) plays a key role in cell cycle progression by setting the target cell size. This ensures cells reach adequate size before entering the S phase of proliferation.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Developmental Biology

Background:

  • Cell proliferation requires a size checkpoint to ensure cells reach a target size before DNA replication.
  • The precise mechanisms determining this target cell size are not fully understood.

Purpose of the Study:

  • To identify the specific molecular players involved in regulating target cell size for cell cycle progression.
  • To elucidate the distinct function of cyclin-dependent kinase 4 (CDK4) in this process.

Main Methods:

  • Investigated cell cycle regulation and size control mechanisms.
  • Utilized genetic and biochemical approaches to analyze CDK4 function.

Main Results:

  • Identified a novel role for CDK4 in determining the specific target cell size.
  • Demonstrated that CDK4 is crucial for the cell size checkpoint that precedes S phase entry.

Conclusions:

  • CDK4 has a distinct function beyond its known roles in cell cycle control.
  • This finding provides new insights into the fundamental mechanisms of cell size regulation during proliferation.

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