Enables protein serine/threonine kinase activity. Involved in cilium assembly; hindbrain development; and smoothened signaling pathway. Acts upstream of or within several processes, including embryonic brain development; nervous system development; and positive regulation of non-motile cilium assembly. Located in centriole; ciliary basal body; and ciliary transition zone. Is expressed in nervous system. Human ortholog(s) of this gene implicated in spinocerebellar ataxia type 11. Orthologous to human TTBK2 (tau tubulin kinase 2). [provided by Alliance of Genome Resources, Apr 2022]