SDCCAG8 regulates pericentriolar material recruitment and neuronal migration in the developing cortex

Area of Science:

• Neuroscience
• Cell Biology
• Genetics

Background:

• Mutations in SDCCAG8 are linked to nephronophthisis, Bardet-Biedl syndrome, and schizophrenia.
• The precise function of SDCCAG8 in cellular processes, particularly in the nervous system, remains largely uncharacterized.

Purpose of the Study:

• To elucidate the function of SDCCAG8 in the developing mammalian brain.
• To investigate the role of SDCCAG8 in neuronal polarization, migration, and centrosome organization.

Main Methods:

• Utilized short-hairpin RNAs and a loss-of-function allele to suppress Sdccag8 expression in developing mouse cortex.
• Investigated centrosomal recruitment of key proteins (γ-tubulin, pericentrin) and microtubule organization.
• Examined the interaction and trafficking of SDCCAG8 with pericentriolar material 1 (PCM1).

Main Results:

• Sdccag8 expression is upregulated in newborn neurons preceding radial migration.
• Suppression of Sdccag8 impairs centrosomal recruitment of pericentriolar material, disrupts microtubule organization, and affects nuclear-centrosome coupling.
• SDCCAG8 interacts with PCM1 and its expression with a human mutation leads to neuronal migration defects.

Conclusions:

• SDCCAG8 plays a critical role in regulating centrosomal properties and function, essential for neuronal migration.
• Findings provide insights into the molecular basis of neurological disorders associated with SDCCAG8 mutations.