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Related Concept Videos

Positive Regulator Molecules01:45

Positive Regulator Molecules

To consistently produce healthy cells, the cell cycle—the process that generates daughter cells—must be precisely regulated.
The Cell Cycle Control System02:11

The Cell Cycle Control System

The cell cycle is an organized set of events that leads the cell to divide into two daughter cells, each containing chromosomes identical to the parent cell. It is the cell cycle that leads to the formation of an entire organism from a single-cell zygote. Besides, cell division also functions in the renewal or repair of tissues in adult multicellular eukaryotes. For example, in the bone marrow, the stem cells divide to form new blood cells. Although essential for several functions, cell...
Positive Regulator Molecules02:39

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Mitotic cell division results in daughter cells that exactly resemble the parent cell. However, errors in the DNA replication or distribution of genetic material may lead to genetic mutations that may be passed down to every new cell formed from the resulting abnormal cell. Propagation of such mutant cells is restricted through checkpoint mechanisms present at different stages of the cell cycle. These checkpoints involve regulator molecules that either promote or demote cell cycle events.
Inhibition of Cdk Activity02:34

Inhibition of Cdk Activity

The orderly progression of the cell cycle depends on the activation of Cdk protein by binding to its cyclin partner. However, the cell cycle must be restricted when undergoing abnormal changes. Most cancers correlate to the deregulated cell cycle, and since Cdks are a central component of the cell cycle, Cdk inhibitors are extensively studied to develop anticancer agents. For instance, cyclin D associates with several Cdks, such as Cdk 4/6, to form an active complex. The cyclin D-Cdk4/6 complex...
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The cell cycle is an organized set of events that leads the cell to divide into two daughter cells, each containing chromosomes identical to the parent cell. It is the cell cycle that leads to the formation of an entire organism from a single-cell zygote. Besides, cell division also functions in the renewal or repair of tissues in adult multicellular eukaryotes. For example, in the bone marrow, the stem cells divide to form new blood cells. Although essential for several functions, cell...
The Cell Cycle Control System01:28

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The cell cycle regulation directs how a cell proceeds from one phase to the next and begins mitosis. The cell cycle control system includes intracellular regulatory molecules and external triggers. They provide "stop" or "advance" signals and operate at specific cell cycle stages termed checkpoints to ensure that a particular process is completed before the cell advances to the next phase.
Cyclins and cyclin-dependent kinases (Cdks) are the primary cell cycle regulators and function at the cell...

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Related Experiment Video

Updated: May 10, 2026

Identification of Cyclin-dependent Kinase 1 Specific Phosphorylation Sites by an In Vitro Kinase Assay
12:26

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Published on: May 3, 2018

An essential G1 function for cyclin-like proteins in yeast.

H E Richardson1, C Wittenberg, F Cross

  • 1Department of Molecular Biology, Research Institute of Scripps Clinic, La Jolla, California 92037.

Cell
|December 22, 1989
PubMed
Summary

Budding yeast cell cycle regulators, cyclins (CLN1, CLN2, CLN3), are essential for G1 phase progression. Their function, likely activating Cdc28 kinase, decays rapidly after biosynthesis ceases, enabling cell proliferation.

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Last Updated: May 10, 2026

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Manipulation and Analysis of Cell Cycle-Dependent Processes in Budding Yeast
08:13

Manipulation and Analysis of Cell Cycle-Dependent Processes in Budding Yeast

Published on: September 26, 2025

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Yeast Genetics

Background:

  • Cyclins, initially identified in marine invertebrates for their cell cycle periodicity, are crucial regulators of cell division.
  • Three S. cerevisiae genes (CLN1, CLN2, DAF1/WHI1) show homology to cyclins and are implicated in cell cycle progression.

Purpose of the Study:

  • To investigate the essential function of CLN1, CLN2, and DAF1/WHI1 gene products in S. cerevisiae cell cycle progression.
  • To determine the phase specificity and regulation of Cln protein function.
  • To test the hypothesis that Cln proteins activate the Cdc28 protein kinase.

Main Methods:

  • Gene deletion studies to assess the impact of CLN1, CLN2, and DAF1/WHI1 loss on cell cycle progression.
  • Conditional expression of CLN1 to define the timing and duration of its essential function.
  • Analysis of Cln protein function decay after cessation of biosynthesis.

Main Results:

  • Mutational elimination of CLN1, CLN2, and DAF1/WHI1 causes cell cycle arrest, while their expression permits proliferation.
  • The essential function of Cln proteins is confined to the G1 phase of the cell cycle.
  • Cln protein function decays rapidly upon cessation of their synthesis, suggesting a short half-life.

Conclusions:

  • Cln proteins are essential for G1 phase progression in S. cerevisiae.
  • The data support the hypothesis that Cln proteins activate the Cdc28 protein kinase, crucial for the G1 to S transition.
  • DAF1/WHI1 was renamed CLN3 due to functional redundancy with CLN1 and CLN2.