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Updated: May 22, 2026

Visualizing Neuroblast Cytokinesis During C. elegans Embryogenesis
Published on: March 12, 2014
CLASPs function redundantly to regulate astral microtubules in the C. elegans embryo
Eugenel B Espiritu1, Lori E Krueger, Anna Ye
1Department of Molecular and Cellular Biology, University of California, Davis 95616, USA.
In C. elegans embryos, CLASPs (cytoskeleton-associated proteins) partially redundantly regulate astral microtubules, ensuring proper spindle positioning during asymmetric cell division. This function is independent of known binding partners.
Area of Science:
- Cell Biology
- Developmental Biology
- Cytoskeleton Dynamics
Background:
- Microtubule dynamics are crucial for spindle positioning during asymmetric cell division.
- Cytoskeleton-associated proteins (CLASPs) are microtubule-associated proteins with conserved roles in regulating microtubule dynamics.
- Caenorhabditis elegans possesses three CLASP homologs (CLS-1, CLS-2, CLS-3), with CLS-2 previously linked to chromosome segregation.
Purpose of the Study:
- To investigate the roles of CLS-1 and CLS-3 in embryonic development, particularly in relation to CLS-2.
- To elucidate the function of CLASPs in spindle positioning during asymmetric cell division in C. elegans.
- To determine if CLASP-mediated spindle positioning is dependent on HCP-1 and HCP-2.
Main Methods:
- Depletion of CLASP homologs using RNA interference in C. elegans embryos.
- Microscopy to analyze nuclear rotation, spindle length, spindle displacement, and microtubule organization.
- Analysis of microtubule plus-end dynamics using the EB1 marker.
Main Results:
- Depletion of CLS-2 with either CLS-1 or CLS-3 caused defects in nuclear rotation, spindle length maintenance, and spindle displacement.
- While overall polarity remained normal, fewer astral microtubules reached the cortex in CLASP-depleted embryos.
- Reduced numbers of growing microtubules reached the cortex, but their polymerization rate was unaffected.
Conclusions:
- C. elegans CLASPs function partially redundantly to regulate astral microtubules essential for spindle positioning in asymmetric cell division.
- The identified role of CLASPs in spindle pole positioning is independent of the CLS-2 binding proteins HCP-1 and HCP-2.
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