The centralspindlin complex regulates cytokinesis and morphogenesis in the C. elegans spermatheca

Area of Science:

• Cell Biology
• Developmental Biology
• Genetics

Background:

• Organ morphogenesis requires precise coordination of cellular events like division, shape change, and rearrangement.
• Cytokinesis, the final stage of cell division, is crucial for regulating organ size, shape, and function.
• The molecular mechanisms by which cytokinesis regulates organ morphogenesis remain largely unclear.

Purpose of the Study:

• To investigate the role of the centralspindlin complex in coordinating cell division and epithelial morphogenesis.
• To elucidate how cytokinesis molecules regulate organ size and shape.
• To identify key signaling networks involved in spermathecal morphogenesis.

Main Methods:

• Utilized Caenorhabditis elegans as a model organism.
• Generated mutants and performed knockdown experiments for centralspindlin components (CYK-4, ZEN-4) and associated proteins (RHO-1, CDC-42).
• Analyzed spermathecal cell division, nuclear division, and overall morphology.

Main Results:

• Loss of CYK-4 and ZEN-4 disrupts cell division, leading to altered cell arrangement and malformation of the C. elegans spermatheca.
• Spermathecal cells frequently underwent nuclear division without completing cytokinesis upon centralspindlin disruption.
• CYK-4 regulates spermathecal cell cytokinesis independently of its GTPase activator activity.
• Morphological defects were exacerbated by RHO-1 knockdown and partially rescued by CDC-42 knockdown in conjunction with CYK-4.

Conclusions:

• The centralspindlin complex (CYK-4, ZEN-4) is essential for coordinating cell division and epithelial morphogenesis by ensuring proper cytokinesis.
• CYK-4, ZEN-4, RHO-1, and CDC-42 form a critical signaling network that guides spermathecal morphogenesis through regulated cytokinesis.
• Completion of cytokinesis is a key mechanism by which these proteins influence organ development.