Developmental deficits, synapse and dendritic abnormalities in a Clcn4 KO autism mice model: endophenotypic target...

Area of Science:

• Neuroscience
• Genetics
• Pharmacology

Background:

• Autism spectrum disorder (ASD) is associated with ion channel dysfunction.
• Chloride voltage-gated channel-4 (CLCN4) is implicated in ASD pathogenesis.
• Understanding CLCN4's role is crucial for developing targeted ASD therapies.

Purpose of the Study:

• To investigate the role of CLCN4 in ASD-like behaviors and synaptic function.
• To evaluate the therapeutic potential of Risperidone in a CLCN4 deficiency model.
• To identify molecular mechanisms underlying CLCN4's impact on neuronal development.

Main Methods:

• Generated Clcn4 knockout (KO) mice and Clcn4 knockdown (KD) cell models.
• Assessed behavioral phenotypes using three-chamber and marble burying tests.
• Analyzed gene expression via RNA sequencing and protein levels via Western blotting.
• Performed Sholl analysis to evaluate dendritic morphology.

Main Results:

• Clcn4 KO mice displayed reduced social interaction and increased repetitive behaviors.
• Risperidone treatment ameliorated ASD-like symptoms and restored synaptic protein phosphorylation (SYNAPSIN, PSD95).
• CLCN4 deficiency led to impaired synaptic plasticity, reduced dendritic branching, and altered gene expression in neural progenitor cells.

Conclusions:

• CLCN4 dysfunction contributes to ASD-endophenotypes through disrupted synaptic plasticity and dendritic development.
• Risperidone demonstrates efficacy by restoring synaptic function and dendritic morphology in a CLCN4-dependent manner.
• Dendritic outgrowth and synapse remodeling are potential therapeutic targets for ASD treatment.