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Related Concept Videos

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.
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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...
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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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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.
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Negative Regulator Molecules01:23

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Positive regulators allow a cell to advance through cell cycle checkpoints. Negative regulators have an equally important role as they terminate a cell’s progression through the cell cycle—or pause it—until the cell meets specific criteria.
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A Simple Method to Identify Kinases That Regulate Embryonic Stem Cell Pluripotency by High-throughput Inhibitor Screening
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G1 cyclins protect pluripotency.

Julia Arand1, Julien Sage1

  • 1Stanford University Medical Center, Departments of Pediatrics and Genetics, Stanford Medical School, SIM1 Building, 265 Campus Drive, Stanford, California 94305, USA.

Nature Cell Biology
|March 2, 2017
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Summary
This summary is machine-generated.

Some cells can divide without G1 cyclins, which are usually vital for DNA replication and cell division. However, G1 cyclins are still needed in stem and cancer cells to maintain pluripotency.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Genetics

Background:

  • G1 cyclins are traditionally viewed as essential regulators of DNA replication and cell cycle progression.
  • Their role in cell division is critical for maintaining genomic stability and organism development.

Purpose of the Study:

  • To investigate the necessity of G1 cyclins in cell cycle progression across different cell types.
  • To determine the specific functions of G1 cyclins in maintaining pluripotency in embryonic stem cells and cancer cells.

Main Methods:

  • Cell cycle analysis
  • Gene knockout studies
  • Western blotting to assess protein phosphorylation
  • Pluripotency marker analysis

Main Results:

  • Demonstrated that certain cell types can undergo cell cycling independently of G1 cyclins.
  • Confirmed that G1 cyclins are indispensable for activating cyclin-dependent kinases in embryonic stem cells and cancer cells.
  • Showed that G1 cyclins are required for the phosphorylation of core pluripotency factors, thereby maintaining pluripotency.

Conclusions:

  • Cellular division is not universally dependent on G1 cyclins.
  • G1 cyclins play a crucial role in maintaining pluripotency by regulating key factors in specific cell contexts, such as stem and cancer cells.