Plays a role in primary ciliogenesis by modulating actin polymerization. Interacts with TTC17. Colocalized with TTC17 at F-actin rich zones and at dynamic plasma membrane protrusions. Expressed in testis and ovary. Strongly expressed in pachytene spermatocytes and round spermatids compared to spermatogonia and somatic cells. Expressed in Leydig cells (at protein level). Belongs to the CATIP family.