Lack of cyclin D2 impairing adult brain neurogenesis alters hippocampal-dependent behavioral tasks without reducing learning ability

► Cyclin D2 knockout mice have no adult brain neurogenesis and smaller hippocampus. ► The mice preserve hippocampal-dependent learning. ► Mice show deficits in nonlearning behaviors - nest building, digging, marble burying. ► Mice show increased activity and delayed sucrose preference. ► Adult brain neurogenesis may be involved in species-typical behaviors.