The ASH domain or N-terminal domain of abnormal spindle-like microcephaly-associated protein are found in proteins associated with cilia, flagella, the centrosome and the Golgi complex. The domain is also found in Hydin and OCRL whose deficiencies are associated with hydrocephalus and Lowe oculocerebrorenal syndrome (OCRL), respectively. The fact that Human ASPM protein carries an ASH domain indicates possible roles for ASPM in sperm flagellar or in ependymal cells' cilia. The presence of ASH in centrosomal and ciliary proteins indicates that ASPM may possess roles not only in mitotic spindle regulation, but also in ciliary and flagellar function [1].

1: A novel domain suggests a ciliary function for ASPM, a brain size determining gene. Ponting CP; Bioinformatics. 2006;22:1031-1035. PMID:16443634