Predicted to be involved in axoneme assembly and cilium movement. Predicted to act upstream of or within cilium assembly and cilium movement involved in cell motility. Predicted to be located in cilium; cytoplasm; and cytoskeleton. Predicted to be part of radial spoke. Predicted to be active in axoneme. Is expressed in midbrain; otic placode; pronephric duct; and spinal cord neural rod. Human ortholog(s) of this gene implicated in primary ciliary dyskinesia 11. Orthologous to several human genes including RSPH4A (radial spoke head component 4A).