CDK5RAP2 (CDK5 regulatory subunit associated protein 2) functions as a critical regulator of centrosome biology and microtubule organization. The protein serves as an essential adapter for recruiting and organizing the γ-tubulin ring complex (γ-TuRC) at centrosomes, where it promotes γ-TuRC closure and activation through multiple binding interactions 1. CDK5RAP2 regulates centrosomal maturation by facilitating microtubule nucleation and extension, working in complex with other proteins including MAPRE1 and AKAP9 1. The protein exhibits spatiotemporal expression patterns during brain development that correlate with regions affected in microcephaly 2. Disease relevance is significant, as homozygous mutations in CDK5RAP2 cause primary autosomal recessive microcephaly type 3 (MCPH3), characterized by reduced brain size, intellectual disability, and cortical abnormalities 32. Recent studies have identified novel pathogenic variants expanding the mutation spectrum 3. Additionally, CDK5RAP2 variants may modulate Alzheimer's disease risk through effects on gene expression 4. The protein's role extends beyond neurodevelopment, with evidence suggesting involvement in cancer stem cell regulation and tumor progression 5. CDK5RAP2's evolutionary significance is highlighted by its interaction with human-specific retrotransposons that regulate neuronal maturation timing 6.