Has an essential role in the assembly and organization of the sperm flagellar axoneme (PubMed:32791035). Required for the elongation of the primary cilium and sperm flagellar midpiece via modulation of the Notch signaling pathway (By similarity). Interacts with ODFP2. Localized to the entire flagellum and predominantly concentrated in the midpiece. Co-localizes with ODFP2 at the centrosome (By similarity). The disease is caused by variants affecting the gene represented in this entry. Belongs to the CFAP58 family.