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Related Experiment Video

Updated: Feb 16, 2026

Identification and Classification of Position-specific GABAA Receptor Subunit Missense Variants for Their Role In Hippocampal Pyramidal Neurons
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A Schizophrenia-Linked KALRN Coding Variant Alters Neuron Morphology, Protein Function, and Transcript Stability.

Theron A Russell1, Melanie J Grubisha2, Christine L Remmers1

  • 1Department of Physiology, Northwestern University Feinberg School of Medicine, Chicago, Illinois.

Biological Psychiatry
|December 16, 2017
PubMed
Summary
This summary is machine-generated.

A rare schizophrenia-linked variant in kalirin (KALRN-P2255T) impairs neuronal function by increasing RhoA activation, impacting dendritic morphology. This finding offers new insights into mental disorder mechanisms.

Keywords:
DendritesDendritic spinesGuanine nucleotide exchange factorsKalirinSchizophreniaSingle nucleotide variants

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Area of Science:

  • Neuroscience
  • Genetics
  • Molecular Biology

Background:

  • Rare sequence variants in glutamatergic synaptic genes are linked to schizophrenia.
  • The KALRN-P2255T single nucleotide variant (SNV) shows high penetrance in schizophrenia.
  • Kalirin (Kal)-9, a guanine nucleotide exchange factor, is upregulated in schizophrenia brain tissue.

Purpose of the Study:

  • To characterize the functional effects of the KALRN-P2255T variant.
  • To investigate its impact on kalirin (Kal)-9 function and neuronal morphology.

Main Methods:

  • Overexpression of wild-type and P2255T kalirin (Kal)-9 in neuronal and HEK293 cells.
  • Assessment of dendritic branching and spine morphology.
  • Analysis of protein and messenger RNA stability, and guanine nucleotide exchange factor catalytic activity.

Main Results:

  • The KALRN-P2255T variant diminished dendritic branching and spine size.
  • P2255T increased RhoA activation but not Rac1 activation.
  • Higher Kal9-P2255T protein levels were observed due to increased messenger RNA stability.
  • Enhanced RhoA activation negatively impacts neuronal morphology.

Conclusions:

  • The KALRN-P2255T SNV impairs kalirin (Kal)-9 function, leading to altered neuronal morphology.
  • Increased RhoA activation is a key mechanism linking this variant to disease.
  • Provides a model for studying morphological changes in mental disorders.