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A function for the midbody remnant in embryonic patterning.

Deepika Singh1, Christian Pohl1

  • 1Buchmann Institute for Molecular Life Sciences; Institute of Biochemistry II; Goethe University; Frankfurt (Main), Germany.

Communicative & Integrative Biology
|October 28, 2014
PubMed
Summary
This summary is machine-generated.

Cell divisions use external cues to align with the organism's axis, ensuring proper cell fate determination. This process involves polarity establishment, spindle orientation, and segregation of determinants for developmental accuracy.

Keywords:
C. elegansasymmetryaxis formationcytokinesisdevelopmentmidbodypatterning

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Area of Science:

  • Developmental Biology
  • Cell Biology

Background:

  • Asymmetric cell divisions integrate cell division with cell fate specification.
  • A general model involves polarity axis specification during interphase, followed by spindle orientation and segregation of fate determinants during mitosis.
  • Hertwig's rule states that the polarity axis and spindle typically align with the cell's long axis before division.

Purpose of the Study:

  • To investigate the mechanisms underlying asymmetric cell division and axis alignment in the C. elegans embryo.
  • To understand how extrinsic cues influence intrinsic polarity formation and spindle orientation.
  • To elucidate the process of successful segregation of fate determinants.

Main Methods:

  • Observation of cell division patterns in C. elegans embryos.
  • Analysis of cortical polarity domain formation and myosin enrichment.
  • Investigation of the role of sperm entry and CYK-4 in directing cortical contractile flow.
  • Examination of nucleus-centrosome complex rotation and spindle elongation.
  • Study of cleavage site positioning relative to the long axis.

Main Results:

  • The first polarity axis in C. elegans forms along the embryo's long axis via myosin enrichment.
  • Sperm entry acts as an extrinsic cue, inhibiting myosin activation at the posterior pole through CYK-4, directing cortical flow.
  • The nucleus-centrosome complex rotates 90 degrees to align the spindle with the long axis.
  • Cleavage site positioning is regulated to be perpendicular to the long axis.

Conclusions:

  • A tight coupling of extrinsic cues with intrinsic polarity and spindle elongation mechanisms ensures division alignment with the organism's long axis.
  • This precise alignment is crucial for the successful segregation of fate determinants during early development.
  • The study elucidates a conserved model for achieving asymmetric cell division and developmental patterning.