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Related Concept Videos

Mitosis and Cytokinesis01:35

Mitosis and Cytokinesis

In eukaryotes, the cell division cycle is divided into distinct, coordinated cellular processes that include cell growth, DNA replication/chromosome duplication, chromosome distribution to daughter cells, and finally, cell division. The cell cycle is tightly regulated by its regulatory systems as well as extracellular signals that affect cell proliferation.
The processes of the cell cycle occur over approximately 24 hours (in typical human cells) and in two major distinguishable stages. The...
Mitosis and Cytokinesis02:03

Mitosis and Cytokinesis

In eukaryotes, the cell division cycle is divided into distinct, coordinated cellular processes that include cell growth, DNA replication/chromosome duplication, chromosome distribution to daughter cells, and finally, cell division. The cell cycle is tightly regulated by its regulatory systems as well as extracellular signals that affect cell proliferation.
The processes of the cell cycle occur over approximately 24 hours (in typical human cells) and in two major distinguishable stages. The...
Mitosis and Cytokinesis02:03

Mitosis and Cytokinesis

In eukaryotes, the cell division cycle is divided into distinct, coordinated cellular processes that include cell growth, DNA replication/chromosome duplication, chromosome distribution to daughter cells, and finally, cell division. The cell cycle is tightly regulated by its regulatory systems as well as extracellular signals that affect cell proliferation.
The processes of the cell cycle occur over approximately 24 hours (in typical human cells) and in two major distinguishable stages. The...
Mitosis And Cytokinesis01:35

Mitosis And Cytokinesis

In eukaryotes, the cell division cycle is divided into distinct, coordinated cellular processes that include cell growth, DNA replication/chromosome duplication, chromosome distribution to daughter cells, and finally, cell division. The cell cycle is tightly regulated by its regulatory systems as well as extracellular signals that affect cell proliferation.
The processes of the cell cycle occur over approximately 24 hours (in typical human cells) and in two major distinguishable stages. The...
The Mitotic Spindle02:27

The Mitotic Spindle

The mitotic spindle—or spindle apparatus—is a eukaryotic, cytoskeletal structure made up of long protein fibers called microtubules. Formed during cell division, the spindle separates sister chromatids and moves them to opposite ends of a parental cell, where the now individual chromosomes are distributed to two daughter cell nuclei.
The bipolar configuration of the mitotic spindle facilitates chromosomal segregation, preparing the cell for division. One mechanism that ensures bipolar mitotic...
The Mitotic Spindle02:27

The Mitotic Spindle

The mitotic spindle—or spindle apparatus—is a eukaryotic, cytoskeletal structure made up of long protein fibers called microtubules. Formed during cell division, the spindle separates sister chromatids and moves them to opposite ends of a parental cell, where the now individual chromosomes are distributed to two daughter cell nuclei.
The bipolar configuration of the mitotic spindle facilitates chromosomal segregation, preparing the cell for division. One mechanism that ensures bipolar mitotic...

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A Cell Free Assay to Study Chromatin Decondensation at the End of Mitosis
11:04

A Cell Free Assay to Study Chromatin Decondensation at the End of Mitosis

Published on: December 19, 2015

PREEParing for mitosis.

Brian Burke1

  • 1Institute of Medical Biology, 8A Biomedical Grove, Immunos, Singapore. brian.burke@imb.a-star.edu.sg

Developmental Cell
|August 17, 2013
PubMed
Summary
This summary is machine-generated.

Endoplasmic reticulum (ER) membranes actively avoid the mitotic spindle, a process dependent on REEP proteins. Without REEPs, ER membranes attach to the spindle, causing chromosome segregation and nuclear envelope assembly issues.

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Area of Science:

  • Cell biology
  • Molecular biology
  • Genetics

Background:

  • The endoplasmic reticulum (ER) is a key organelle involved in protein synthesis and lipid metabolism.
  • During cell division, the precise localization of cellular components is crucial for accurate chromosome segregation and daughter cell formation.
  • The dynamic behavior of the ER membrane during mitosis has been an area of active investigation.

Purpose of the Study:

  • To investigate the mechanism by which endoplasmic reticulum (ER) membranes are excluded from the mitotic spindle.
  • To identify the proteins involved in regulating ER membrane positioning during cell division.
  • To understand the consequences of ER membrane mislocalization on chromosome segregation and nuclear envelope assembly.

Main Methods:

  • Utilized live-cell imaging to observe ER membrane dynamics during mitosis.
  • Employed RNA interference (RNAi) to deplete specific membrane proteins, including REEPs (ER membrane proteins).
  • Performed immunofluorescence microscopy to analyze the localization of ER membranes, spindle components, and chromosomes.

Main Results:

  • Demonstrated that the exclusion of ER membranes from the mitotic spindle is an active, protein-dependent process.
  • Showed that REEP proteins are essential for preventing ER membrane association with the spindle and chromosomes.
  • Observed significant defects in chromosome segregation and nuclear envelope reassembly upon depletion of REEP proteins.

Conclusions:

  • REEP proteins play a critical role in the spatial regulation of the ER membrane during mitosis.
  • Mislocalization of ER membranes due to REEP deficiency leads to severe mitotic errors.
  • This study reveals a novel mechanism for maintaining organelle integrity and function during cell division.