ASPM is the human ortholog of the Drosophila melanogaster 'abnormal spindle' gene (asp), which is essential for normal mitotic spindle function in embryonic neuroblasts. Studies in mouse also suggest a role of this gene in mitotic spindle regulation, with a preferential role in regulating neurogenesis. Mutations in this gene are associated with microcephaly primary type 5. Multiple transcript variants encoding different isoforms have been found for this gene. ASPM (Abnormal Spindle Microtubule Assembly) is a Protein Coding gene. Diseases associated with ASPM include Microcephaly 5, Primary, Autosomal Recessive and Primary Microcephaly.