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Immunohistochemical Visualization of Hippocampal Neuron Activity After Spatial Learning in a Mouse Model of Neurodevelopmental Disorders

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Published on: May 12, 2015

Genetic background determines synaptic phenotypes in Arid1b-mutant mice.

Hyosang Kim¹, Eunjoon Kim^1,2

¹Center for Synaptic Brain Dysfunctions, Institute for Basic Science (IBS), Daejeon, Republic of Korea.

Frontiers in Psychiatry

|March 22, 2024

Summary

Genetic background significantly influences synaptic changes in Arid1b-mutant mice, affecting autism spectrum disorder (ASD) phenotypes. This study highlights the role of genetic background in determining inhibitory synaptic transmission in Arid1b-mutant models.

Keywords:

ARID1B mutation genetic background miniature excitatory postsynaptic currents miniature inhibitory postsynaptic currents synaptic phenotype

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Published on: December 11, 2009

Area of Science:

Neuroscience
Genetics
Developmental Biology

Background:

ARID1B, a chromatin remodeler, is linked to autism spectrum disorders (ASD).
Previous studies on Arid1b-mutant mice showed differing synaptic phenotypes based on genetic background.
These differences involved synaptic transmission in medial prefrontal cortex (mPFC) pyramidal neurons.

Purpose of the Study:

To investigate the impact of genetic background on synaptic phenotypes in Arid1b-mutant mice.
To reconcile conflicting findings from previous studies on Arid1b-mutant mice.
To determine if genetic background influences both inhibitory and excitatory synaptic transmission.

Main Methods:

Utilized heterozygous Arid1b-mutant (Arid1b+/-) mice on different genetic backgrounds (C57BL/6N vs. C57BL/6J).
Performed electrophysiological recordings in layer 5 and layer 2/3 pyramidal neurons of the medial prefrontal cortex (mPFC).
Compared synaptic transmission phenotypes between different genetic backgrounds.

Main Results:

Changing the genetic background of Arid1b+/- mice to C57BL/6J replicated findings from the first study, showing decreased inhibitory synaptic transmission in layer 5 mPFC neurons.
This genetic background shift also revealed decreased excitatory synaptic transmission in layer 2/3 mPFC neurons, consistent with the second study.
These results indicate genetic background is a key factor for inhibitory synaptic phenotypes but has minimal effect on excitatory ones.

Conclusions:

Genetic background is a critical determinant of synaptic phenotypes in Arid1b-mutant mice.
The study reconciles conflicting results by demonstrating the influence of genetic background on inhibitory synaptic transmission.
Understanding these genetic influences is crucial for elucidating the mechanisms underlying ASD.