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Related Concept Videos

Chemotaxis and Direction of Cell Migration01:21

Chemotaxis and Direction of Cell Migration

Cells can detect chemical cues in their environment and reorganize the cytoskeleton to migrate toward them or away from them. This directional migration, called chemotaxis, is essential during embryogenesis and development, immune response, tissue repair and regeneration, and reproduction. These chemical cues can either attract or repel the cell's movement. For example, axon development is determined by a combination of chemoattractants and chemorepellents that direct the growing axon towards...
Cytoskeletal Coordination in Cell Migration01:32

Cytoskeletal Coordination in Cell Migration

A migrating cell changes its shape during the cyclic events of attachment and detachment from the substratum and repositions the cell organelles correspondingly. These complex events are orchestrated by the dynamic cytoskeletal network comprising actin filaments, intermediate filaments, and microtubules. Cytoskeletal crosstalk — the direct and indirect communication between the different components — is crucial for this coordination. Direct communication involves various linker proteins that...
Actin Polymerization and Cell Motility01:13

Actin Polymerization and Cell Motility

Actin is a family of globular proteins that are highly abundant in eukaryotic cells. It makes up approximately 1-5% of total cell protein concentration. Actin monomers polymerize to form a complex network of polarized filaments, the actin cytoskeleton, that plays a crucial role in many cellular processes, including cell motility, division, endocytosis, and metastasis of cancer cells.
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Cell Migration01:09

Cell Migration

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.
Cell Migration01:19

Cell Migration

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.
Role of Myosin in Cell Migration01:18

Role of Myosin in Cell Migration

Myosins are multimeric motor proteins involved in various cellular processes such as migration, adhesion, and proliferation. Myosin II is the most common type in animal cells, which binds and cross-links actin filaments.
Myosin II  is a hexamer comprising two heavy chains with globular heads and coiled-coil tails, two regulatory light chains, and two essential light chains. The ATPase sites on the myosin heads hydrolyze ATP, and the released phosphate generates the force for contraction. It is...

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Sequential SDF1a and b-induced mobility guides Medaka PGC migration.

Amaury Herpin1, Peter Fischer, Daniel Liedtke

  • 1University of Wuerzburg, Department of Physiological Chemistry I, Biozentrum, Am Hubland, D-97074 Wuerzburg, Germany.

Developmental Biology
|April 29, 2008
PubMed
Summary

Primordial germ cell (PGC) migration is crucial for gonad development. In Medaka fish, PGCs migrate using a dual guidance system involving two SDF1 (stromal cell-derived factor 1) co-orthologues, unlike zebrafish which use a single SDF1a.

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Area of Science:

  • Developmental Biology
  • Reproductive Biology
  • Genetics

Background:

  • Gonad formation is essential for sexual differentiation and reproduction.
  • Primordial germ cells (PGCs) migrate to form the gonadal primordium.
  • Chemokines like SDF1 (stromal cell-derived factor 1) and their receptors (e.g., CXCR4) guide PGC migration in various species.

Purpose of the Study:

  • To investigate the mechanisms of PGC migration in Medaka.
  • To compare PGC migration guidance in Medaka with other model organisms like zebrafish.
  • To elucidate the roles of SDF1 co-orthologues in Medaka PGC positioning.

Main Methods:

  • Comparative analysis of PGC migration pathways in Medaka.
  • Investigation of SDF1a and SDF1b expression patterns during gonad development.
  • Functional studies to assess the cooperative roles of SDF1 co-orthologues.

Main Results:

  • Medaka PGC migration is guided by both SDF1a and SDF1b, unlike zebrafish which rely on SDF1a.
  • SDF1a and SDF1b exhibit partially overlapping expression patterns.
  • Both SDF1 co-orthologues cooperate to ensure correct PGC positioning.

Conclusions:

  • Medaka utilizes a cooperative SDF1a/SDF1b system for PGC migration, highlighting evolutionary divergence in germ cell guidance mechanisms.
  • Understanding these pathways is critical for reproductive biology and developmental studies.
  • This research provides insights into the complex molecular interactions governing early gonad development.