Exploratory Analysis of MicroRNA Alterations in a Neurodevelopmental Mouse Model for Autism Spectrum Disorder and...

Area of Science:

• Neuroscience
• Genetics
• Molecular Biology

Background:

• MicroRNAs (miRNAs) are critical regulators of gene expression implicated in autism spectrum disorder (ASD) and schizophrenia (SCZ).
• Understanding miRNA dysregulation in neurodevelopmental disorders is crucial for identifying pathological mechanisms and therapeutic targets.

Purpose of the Study:

• To investigate the expression profiles of specific miRNAs in the prefrontal cortex (PFC) of a neurodevelopmental mouse model mimicking perinatal pathology relevant to ASD and SCZ.
• To examine potential sexual dimorphism in miRNA expression within this model.
• To identify miRNAs that could serve as biomarkers or therapeutic targets for ASD and SCZ.

Main Methods:

• Utilized a mouse model induced by ketamine administration during early postnatal development to mimic neuropathogenesis of ASD and SCZ.
• Analyzed adult prefrontal cortex miRNA expression, focusing on those previously linked to ASD (miR-451a, miR-486-3p) and SCZ (miR-132-3p, miR-137-3p), as well as those implicated in both.
• Investigated sex-specific differences in miRNA expression patterns.

Main Results:

• Observed significant alterations in PFC miRNA expression in the ASD- and SCZ-like mouse model.
• Identified upregulation of miR-451a and downregulation of miR-137-3p.
• Detected sexual dimorphism in the expression of miR-132-3p, miR-137-3p, and miR-92a-2-5p.

Conclusions:

• The findings highlight the altered expression of specific miRNAs in a mouse model relevant to ASD and SCZ.
• Sexual dimorphism in miRNA expression suggests distinct pathological pathways or responses in males and females.
• miR-92a-2-5p, miR-132-3p, miR-137-3p, and miR-451a are proposed as potential biomarkers and therapeutic targets for ASD and SCZ.