Acts upstream of or within several processes, including embryonic organ development; myotome development; and smoothened signaling pathway. Located in motile cilium and photoreceptor connecting cilium. Part of intraciliary transport particle A. Is expressed in prostate gland; salivary gland; and testis. Used to study ciliopathy. Human ortholog(s) of this gene implicated in several diseases, including Caroli disease; Senior-Loken syndrome; asphyxiating thoracic dystrophy 5; cranioectodermal dysplasia 4; and nephronophthisis 13. Orthologous to human WDR19 (WD repeat domain 19). [provided by Alliance of Genome Resources, Apr 2022]