Early loss of Scribble affects cortical development, interhemispheric connectivity and psychomotor activity

Area of Science:

• Neuroscience
• Developmental Biology
• Genetics

Background:

• Neurodevelopmental disorders stem from disruptions in cell proliferation, differentiation, migration, and commissure formation.
• The Scribble (Scrib) protein is a key regulator of cell polarity essential for these developmental processes.
• Human SCRIB gene mutations are linked to neural tube defects and Verheij syndrome.

Purpose of the Study:

• To investigate the role of Scrib in brain morphogenesis and behavior.
• To assess the impact of Scrib deletion on corticogenesis and associated developmental mechanisms.

Main Methods:

• Generation of brain-specific conditional knockout (cKO) mouse mutants lacking Scrib.
• Analysis of brain structure, including cortical thickness and commissure formation.
• Behavioral testing to evaluate psychomotor deficits and memory alterations.

Main Results:

• Embryonic deletion of Scrib in the telencephalon resulted in microcephaly and agenesis of the corpus callosum and hippocampal commissure.
• Scrib deletion disrupted neurogenesis, neuronal migration, and axonal connectivity.
• Scrib cKO mice exhibited psychomotor deficits, including impaired locomotor activity and memory alterations.

Conclusions:

• Scrib is essential for early brain development, regulating critical cellular mechanisms in corticogenesis.
• Disruption of Scrib function contributes to neurodevelopmental abnormalities.
• These findings provide insights into the pathogenesis of complex neurodevelopmental disorders.