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Arid1b haploinsufficiency disrupts cortical interneuron development and mouse behavior.

Eui-Man Jung1, Jeffrey Jay Moffat1, Jinxu Liu2

  • 1Department of Developmental Neuroscience, Munroe-Meyer Institute, University of Nebraska Medical Center, Omaha, Nebraska, USA.

Nature Neuroscience
|November 30, 2017
PubMed
Summary

Haploinsufficiency of the AT-rich interactive domain 1B (ARID1B) gene impairs brain development, leading to autism and intellectual disability. Mouse models show reduced GABAergic interneurons and cognitive deficits, offering insights into neurodevelopmental disorders.

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Area of Science:

  • Neuroscience
  • Genetics
  • Developmental Biology

Background:

  • Haploinsufficiency of the AT-rich interactive domain 1B (ARID1B) gene is linked to autism spectrum disorder (ASD) and intellectual disability (ID).
  • The underlying neurobiological mechanisms remain largely unknown.

Purpose of the Study:

  • To investigate the neurobiological basis of ARID1B haploinsufficiency in ASD and ID.
  • To model human ARID1B mutations in mice to study their effects on brain development and behavior.

Main Methods:

  • Generated Arid1b-knockout mice, focusing on heterozygous models to mimic human patients.
  • Analyzed cortical GABAergic interneuron populations and progenitor proliferation in the ganglionic eminence.
  • Assessed synaptic balance, histone acetylation (H3K9ac) at specific promoters (e.g., Pvalb), and gene transcription.
  • Evaluated cognitive and social behaviors in Arid1b-heterozygous mice and tested rescue strategies.

Main Results:

  • Arid1b-heterozygous mice displayed reduced cortical GABAergic interneurons and impaired interneuron progenitor proliferation.
  • Observed an imbalance between excitatory and inhibitory synapses in the cerebral cortex.
  • Found suppressed global H3K9ac, with specific reduction at the Pvalb promoter, leading to decreased transcription.
  • Demonstrated abnormal cognitive and social behaviors in Arid1b-heterozygous mice.

Conclusions:

  • Arid1b plays a critical role in interneuron development and is essential for normal cognitive and social behaviors.
  • Arid1b haploinsufficiency disrupts GABAergic system development and synaptic function, contributing to ASD and ID pathogenesis.
  • Targeting GABAergic pathways, such as with GABAA receptor modulators, may offer therapeutic potential for ARID1B-associated neurodevelopmental disorders.