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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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Occludin deficiency is associated with developmental impairment, locomotor dysfunction, and social deficiencies

Silvia Torices1, Nikolai Fattakhov1, Oandy Naranjo1

  • 1Department of Biochemistry and Molecular Biology, University of Miami Miller School of Medicine, Miami, FL, USA.

Tissue Barriers
|March 24, 2026
PubMed

Insights

Occludin (ocln) deficiency in mice causes behavioral changes similar to neurodevelopmental disorders. These mice show motor deficits, hyperactivity, and social issues, highlighting ocln's role in brain health.

Area of Science:

  • Neuroscience
  • Molecular Biology
  • Genetics

Background:

  • Neurodevelopmental and psychiatric disorders are linked to blood-brain barrier (BBB) dysfunction.
  • Occludin (ocln) is a key tight junction protein crucial for maintaining BBB integrity.

Purpose of the Study:

  • To investigate the behavioral and neurological consequences of occludin deficiency.
  • To explore the role of occludin in neurodevelopment and its potential link to psychiatric disorders.

Main Methods:

  • Generation and characterization of occludin-deficient (ocln-/-) mice.
  • Behavioral assessments including motor function, hyperactivity, social interaction, and attention.
  • Analysis of occludin expression in different brain regions (hippocampus, frontal cortex, striatum).

Main Results:

  • Occludin-deficient mice exhibited abnormal growth, neurological deficits, and impaired motor functions.
  • Adult ocln-/- mice displayed increased hyperactivity, social deficits, and attention impairments.
  • The hippocampus showed the highest occludin expression, suggesting susceptibility to ocln deficiency.

Conclusions:

  • Occludin deficiency leads to behavioral alterations mirroring symptoms of attention deficit hyperactivity disorder and autism spectrum disorder.
  • These findings underscore the critical role of occludin in maintaining neurological function and BBB integrity.
  • Occludin may be a potential therapeutic target for neurodevelopmental and psychiatric disorders.

Keywords:
Autism spectrum disorderblood-brain barriermotor dysfunctionneurodevelopmental disordersoccludin

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