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Related Experiment Video

Updated: Jun 25, 2026

Osmotic Avoidance in Caenorhabditis elegans: Synaptic Function of Two Genes, Orthologues of Human NRXN1 and NLGN1, as Candidates for Autism
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C. elegans CARMIL negatively regulates UNC-73/Trio function during neuronal development.

Pamela J Vanderzalm1, Amita Pandey, Michael E Hurwitz

  • 1Molecular and Cell Biology, University of California, Berkeley, CA 94720, USA.

Development (Cambridge, England)
|February 27, 2009
PubMed
Summary
This summary is machine-generated.

CRML-1, a CARMIL homolog, inhibits neuronal cell and axon growth cone migrations by blocking Rac signaling. This finding reveals CRML-1 as a novel negative regulator of cell migration pathways.

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Molecular Biology

Background:

  • Limited knowledge exists regarding molecules that inhibit cell and axonal growth cone migrations.
  • Mammalian CARMIL promotes glioblastoma cell migration, suggesting diverse roles for CARMIL family proteins.

Purpose of the Study:

  • To identify novel inhibitors of neuronal cell and axon growth cone migrations.
  • To elucidate the molecular mechanism by which CRML-1 regulates these processes in *C. elegans*.

Main Methods:

  • Genetic screens in *C. elegans* to identify negative regulators of migration.
  • Analysis of CRML-1's interaction with UNC-73, a Rac GEF.
  • Investigation of CRML-1's role in regulating the SAX-3 (Robo homolog) guidance receptor.

Main Results:

  • CRML-1 was identified as a negative regulator of neuronal cell and axon growth cone migrations in *C. elegans*.
  • CRML-1 inhibits the Rac GEF activity of UNC-73, a Trio homolog.
  • CRML-1 and UNC-73 form a complex in vivo, and their antagonism influences SAX-3 levels and growth cone guidance.

Conclusions:

  • CRML-1 acts as a novel inhibitor of cell and axon migrations by antagonizing Rac signaling.
  • The CRML-1/UNC-73 interaction provides a mechanism for regulating neuronal migration direction.
  • CRML-1 represents a potential therapeutic target for conditions involving aberrant cell migration.