The technology features a mouse model designed with a megamer-based CRISPR/Cas9 genome editing strategy that replicates a human de novo missense mutation associated with a neurodevelopmental disorder. This model precisely introduces the analogous R201W mutation in mice, allowing direct in vivo analysis of neurodevelopmental deficits. It provides researchers with a critical tool to dissect underlying biological mechanisms and evaluate potential therapeutic interventions in a controlled, whole-organism setting. Unlike cell-based systems, this model supports comprehensive studies of the disorder’s effects on brain development and function.