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The Shank3 knock in mouse enables isoform-specific functional studies of Shank3a. | LitMetric

AI Article Synopsis

Article Abstract

Background: Shank3 is a scaffolding protein essential for the organization and function of the glutamatergic postsynapse. Monogenic mutations in gene are among the leading genetic causes of Autism Spectrum Disorders (ASD). The multiplicity of Shank3 isoforms seems to generate as much functional diversity and yet, there are no tools to study endogenous Shank3 proteins in an isoform-specific manner.

Methods: In this study, we created a novel transgenic mouse line, the Shank3 knock in mouse, which allows to monitor the endogenous expression of the major Shank3 isoform in the brain, the full-length Shank3a isoform.

Results: We show that the endogenous Venus-Shank3a protein is localized in spines and is mainly expressed in the striatum, hippocampus and cortex of the developing and adult brain. We show that Shank3 and Shank3 mice have no behavioral deficiency. We further crossed Shank3 mice with Shank3 mice, a model of ASD, to track the Venus-tagged wild-type copy of Shank3a in physiological (Shank3) and pathological (Shank3) conditions. We report a developmental delay in brain expression of the Venus-Shank3a isoform in Shank3 mice, compared to Shank3 control mice.

Conclusion: Altogether, our results show that the Shank3 mouse line is a powerful tool to study endogenous Shank3a expression, in physiological conditions and in ASD.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9773256PMC
http://dx.doi.org/10.3389/fnins.2022.1081010DOI Listing

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