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Related Concept Videos

Cell Polarization by Rho Proteins01:21

Cell Polarization by Rho Proteins

Cell polarity is the asymmetric distribution of cellular and membrane components, making one side of the cell different from the other. This polarity is essential to many processes such as embryogenesis, axon migration, glucose transport across epithelial cells, and directional cell migration. A migrating cell responds to intracellular or extracellular signals via molecular cascades that reorganize the actin cytoskeleton to establish this polarity. In these cells, the Rho family proteins Cdc42,...
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Positioning the cell division plane is a critical step during development and cell differentiation, particularly during mitosis when the plane is essential for determining the size of the two daughter cells. The cell division plane is perpendicular to the plane of chromosome segregation, but different types of organisms have different cell division mechanisms to suit their morphology and function. 
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Cell migration, the process by which cells move from one location to another, is essential for the proper development and viability of organisms throughout their life. When cells are not able to migrate properly to their ordained locations, various disorders may occur. For example, disruption in cell migration causes chronic inflammatory diseases such as arthritis.
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Cell migration is a process by which the cells move from one location to another, playing an essential role in embryological development, repair and regeneration, immune response, and metastasis. Cells migrate in response to chemical or mechanical signals generated by specific organs or tissues. The overall mechanism includes three steps - polarization, protrusion, and release. Polarization involves the formation of a distinct cell front and rear, which determines the direction of movement.

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Mob1: defining cell polarity for proper cell division.

Alexandra Tavares1, João Gonçalves, Cláudia Florindo

  • 1Instituto Gulbenkian de Ciência, Apartado 14, 2781-901 Oeiras, Portugal.

Journal of Cell Science
|February 15, 2012
PubMed
Summary

Mob1 protein acts as a key cell polarity marker in Tetrahymena, crucial for accurate cell division and cilia development. Its depletion disrupts division plane placement, cytokinesis, and ciliogenesis.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Genetics

Background:

  • Mob1 protein is essential for cell division processes, including cytokinesis, proliferation, and apoptosis, within the mitotic exit network and Hippo pathway.
  • Accurate cell division relies on establishing a proper cell division axis, influenced by environmental cues and intrinsic cell polarity.
  • The ciliate Tetrahymena thermophila exhibits unique features like a permanent anterior-posterior axis and symmetric division, making it an interesting model for studying cell polarity.

Purpose of the Study:

  • To investigate the role of Mob1 in the unique cell division and polarity mechanisms of Tetrahymena thermophila.
  • To identify Mob1 as a potential molecular marker for cell polarity in Tetrahymena.

Main Methods:

  • Depletion of Mob1 protein in Tetrahymena cells.
  • Microscopic analysis of cell division, basal body localization, and cilia formation.
  • Observation of cell morphology and developmental processes.

Main Results:

  • Mob1 was unexpectedly found to accumulate in basal bodies at the posterior pole, serving as the first described molecular polarity marker in Tetrahymena.
  • Mob1 depletion led to abnormal cell division plane establishment, indicating its critical role in defining the division axis.
  • Cells depleted of Mob1 experienced cytokinesis arrest and delayed ciliogenesis, revealing a novel involvement of Mob1 in cilia biology.

Conclusions:

  • Mob1 functions as a vital cell polarity marker in Tetrahymena.
  • Mob1 is crucial for the correct placement of the cell division plane, completion of cytokinesis, and normal cilia growth.
  • This study provides the first evidence linking Mob1 to cilia biology and establishes its multifaceted role in Tetrahymena cell organization and division.