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Basal cytoplasmic calcium levels regulate C. elegans germ stem cell proliferation.

Alexandra C Wells1, Parva M Vyas1, Aahana N Shankaran1

  • 1Department of Cellular Biology, University of Georgia, Athens, GA 30602.

Biorxiv : the Preprint Server for Biology
|November 19, 2025
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Summary

Basal cytoplasmic calcium levels regulate the proliferation rate of Caenorhabditis elegans germ cells. The TRPM7-related GON-2 calcium channel is essential for maintaining these calcium levels and subsequent cell division.

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Area of Science:

  • Cell Biology
  • Developmental Biology
  • Molecular Biology

Background:

  • The Caenorhabditis elegans germline is a key model for studying germ cell biology.
  • Calcium signaling plays a role in various cellular processes, but its role in regulating germline proliferation is not fully understood.

Purpose of the Study:

  • To investigate the relationship between cytoplasmic calcium levels and germ cell proliferation in C. elegans.
  • To identify the molecular mechanisms regulating basal calcium levels in the germline.

Main Methods:

  • Development of an integrated ratiometric calcium reporter for comparative analysis of germ cell calcium.
  • Genetic manipulation of the GON-2 calcium channel and other calcium transporters (plasma membrane calcium ATPase, SERCA).
  • Observation of germ cell proliferation rates under various physiological and genetic conditions.

Main Results:

  • A positive correlation was observed between the rate of germ cell proliferation and basal cytoplasmic calcium levels.
  • Conditions decreasing proliferation (starvation, altered signaling) reduced calcium levels.
  • Overproliferating tumor cells exhibited increased basal calcium levels.
  • Inactivation of the GON-2 calcium channel significantly decreased both basal calcium levels and proliferation.
  • Inhibition of calcium efflux (plasma membrane calcium ATPase) or uptake (SERCA) increased basal calcium and proliferation.

Conclusions:

  • Basal cytoplasmic calcium levels act as a rheostat to modulate C. elegans germ cell proliferation.
  • The GON-2 calcium channel is crucial for maintaining basal cytoplasmic calcium levels in the germline.
  • This study identifies the germline as the first C. elegans tissue where proliferation rate is directly regulated by basal calcium levels.