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Related Concept Videos

Replication in Eukaryotes01:29

Replication in Eukaryotes

In eukaryotic cells, DNA replication is highly conserved and tightly regulated. Multiple linear chromosomes must be duplicated with high fidelity before cell division, so there are many proteins that fulfill specialized roles in the replication process. Replication occurs in three phases: initiation, elongation, and termination, and ends with two complete sets of chromosomes in the nucleus.
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Replication in Eukaryotes02:31

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Replication in Eukaryotes01:29

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In eukaryotic cells, DNA replication is highly conserved and tightly regulated. Multiple linear chromosomes must be duplicated with high fidelity before cell division, so there are many proteins that fulfill specialized roles in the replication process. Replication occurs in three phases: initiation, elongation, and termination, and ends with two complete sets of chromosomes in the nucleus.
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Measuring Endoreduplication by Flow Cytometry of Isolated Tuber Protoplasts
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Published on: March 9, 2018

Developmentally programmed endoreduplication in animals.

Zakir Ullah1, Chrissie Y Lee, Mary A Lilly

  • 1Genomics of Differentiation Program, National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, MD 20892, USA.

Cell Cycle (Georgetown, Tex.)
|April 18, 2009
PubMed
Summary
This summary is machine-generated.

Endoreduplication allows cells to duplicate their genome multiple times without dividing, a process crucial for development in both mammals and insects like Drosophila. This occurs by preventing mitosis and cell division, leading to specialized cell types.

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Area of Science:

  • Cell Biology
  • Developmental Biology
  • Genetics

Background:

  • Cellular development typically involves genome duplication followed by cell division.
  • Some specialized cells, like trophoblast giant cells and megakaryocytes in mammals, and most larval tissues in Drosophila, undergo endoreduplication, duplicating their genome multiple times without cell division.
  • Endoreduplication requires preventing mitosis and cytokinesis while allowing DNA replication and avoiding apoptosis.

Purpose of the Study:

  • To explore the mechanisms of endoreduplication in mammals and Drosophila.
  • To identify similarities and differences in how these organisms transition from mitotic cell cycles to endocycles.
  • To understand the critical regulatory steps controlling endoreduplication.

Main Methods:

  • Comparative analysis of cell cycle regulation in mammals and Drosophila.
  • Investigation of the roles of cell cycle control proteins, including cyclin-dependent kinases (CDKs) and the anaphase-promoting complex (APC).
  • Examination of the transition from mitosis to endocycles, focusing on the regulation of DNA replication and cell division.

Main Results:

  • Endoreduplication is a conserved process across species, essential for terminal cell differentiation.
  • Both mammals and Drosophila employ mechanisms to prevent mitosis and cytokinesis during endoreduplication.
  • A key regulatory switch involves the anaphase-promoting complex (APC), transitioning from a CDK-dependent to a CDK-independent state.

Conclusions:

  • Developmentally regulated endoreduplication is a critical process for generating specialized cell types.
  • The transition from mitotic cycles to endocycles involves precise control over cell cycle progression.
  • The regulation of the anaphase-promoting complex (APC) by cyclin-dependent kinase (CDK) activity is a conserved and critical step in endoreduplication.