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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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The intrinsic polarity of cells can be primarily attributed to two factors- i) the asymmetric accumulation of mobile components such are regulatory molecules and subcellular components across the cell and ii) the orientation of polar cytoskeletal filaments that make up the cytoskeletal networks, specifically microfilaments, and microtubules arranged along the axis of polarity. Interactions between the cytoskeletal filaments are crucial for the establishment and maintenance of the polar nature...
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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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AMEBaS: Automatic Midline Extraction and Background Subtraction of Ratiometric Fluorescence Time-Lapses of Polarized Single Cells
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Basic rules for polarised cell growth.

M Z A M Jaffar1, F A Davidson

  • 1Division of Mathematics, University of Dundee, Dundee, DD1 4HN, Scotland, UK.

Journal of Theoretical Biology
|July 16, 2013
PubMed
Summary
This summary is machine-generated.

Cell elongation, a common growth form across life, follows basic physical rules. This study uses a mathematical model to link cell geometry and new wall material deposition, predicting growth patterns.

Keywords:
CurvatureMathematical modelTip growth

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Area of Science:

  • Developmental biology
  • Cell biology
  • Mathematical modeling

Background:

  • Polarized cell growth, such as hyphal tip growth and pollen tube development, is a conserved morphological process across diverse taxa.
  • Despite variations in underlying biological mechanisms, the commonality of polarized growth suggests adherence to fundamental physical principles.
  • Understanding these basic physical rules is crucial for elucidating developmental processes.

Purpose of the Study:

  • To investigate the relationship between cell geometry and the deposition of new cell wall material in polarized growth.
  • To elucidate fundamental physical rules governing polarized cell development.
  • To develop and apply a mathematical model to predict cell geometry and wall deposition patterns.

Main Methods:

  • Focused on a simplified, ubiquitous geometric description of polarized cells.
  • Employed a mathematical model to analyze the interplay between geometry and cell wall deposition.
  • Tested the model's predictions against various biological examples.

Main Results:

  • The developed mathematical model successfully predicts cell geometry in diverse examples of polarized growth.
  • The model accurately identifies the locations of maximal cell wall deposition based on geometric principles.
  • Demonstrates a quantitative link between a cell's shape and its growth pattern.

Conclusions:

  • Geometric constraints and cell wall deposition are intrinsically linked in polarized growth.
  • A simple mathematical framework can explain key aspects of polarized cell morphology across kingdoms.
  • This work provides insights into the universal physical laws governing cell elongation and development.