A dynamic basal complex modulates mammalian sperm movement

Abstract Reproductive success depends on efficient sperm movement driven by axonemal dynein-mediated microtubule sliding. Models predict sliding at the base of tail – centriole but such has never been observed. Centrioles are ancient organelles with a conserved architecture; their rigidity is thought to restrict Here, we show that, in mammalian sperm, atypical distal (DC) and its surrounding pericentriolar matrix form dynamic basal complex (DBC) that facilitates cascade internal deformations, coupling beating asymmetric head kinking. During beating, DC’s right side surroundings slide ~300 nm rostrally relative left side. The deformation throughout DBC transmitted head-tail junction; thus, tilts left, generating kinking motion. These findings suggest evolved as linker into single self-coordinated system.