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Osmotic Avoidance in Caenorhabditis elegans: Synaptic Function of Two Genes, Orthologues of Human NRXN1 and NLGN1, as Candidates for Autism
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Sorting nexin 3 mutation impairs development and neuronal function in Caenorhabditis elegans.

Neide Vieira1,2, Carlos Bessa1,2, Ana J Rodrigues1,2

  • 1School of Medicine, Life and Health Sciences Research Institute (ICVS), University of Minho, Campus Gualtar, 4710-057, Braga, Portugal.

Cellular and Molecular Life Sciences : CMLS
|December 3, 2017
PubMed
Summary

The study reveals that the sorting nexin 3 (SNX-3) protein is crucial for nervous system development and function in C. elegans. Loss of SNX-3 causes developmental and behavioral defects, highlighting its role in neuronal health.

Keywords:
BehaviorImpaired developmentNervous systemNeuronal defectsSorting nexins

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Genetics

Background:

  • Sorting nexins (SNXs) are implicated in protein trafficking and signaling, with links to neurodegenerative diseases like Alzheimer's.
  • The specific functions of SNXs within the nervous system remain largely uncharacterized.

Purpose of the Study:

  • To investigate the roles of distinct SNX family members in the nervous system using the model organism C. elegans.
  • To elucidate the in vivo function of SNX-3 in neuronal development and behavior.

Main Methods:

  • Screening of C. elegans SNXs deletion mutants for morphological, developmental, and behavioral changes.
  • Analysis of osmotic, thermal, and oxidative stress susceptibility in mutant worms.
  • Assessment of neuronal architecture, wiring, and specific interneuron structures (AIY).
  • Rescue experiments involving pan-neuronal expression of C. elegans SNX-3.

Main Results:

  • snx-3 gene mutation in C. elegans resulted in significant developmental defects, including delayed hatching, reduced brood size, shorter lifespan, and decreased body length.
  • ∆snx-3 mutants exhibited heightened susceptibility to osmotic, thermal, and oxidative stress.
  • Behavioral analysis revealed chemotaxis deficits independent of Wnt secretion, alongside abnormal GABAergic neuronal architecture and AIY interneuron structure.
  • Pan-neuronal expression of SNX-3 rescued locomotion and chemotaxis defects in the mutant.

Conclusions:

  • This study provides the first in vivo evidence demonstrating the critical role of SNX-3 in the nervous system.
  • SNX-3 is essential for normal neuronal development, function, and stress resistance in C. elegans.
  • Further research into SNX-3 may offer insights into neurodegenerative disorders associated with SNX protein dysfunction.