Major structural component of the ciliary rootlet, a cytoskeletal-like structure in ciliated cells which originates from the basal body at the proximal end of a cilium and extends proximally toward the cell nucleus (By similarity). Furthermore, is required for the correct positioning of the cilium basal body relative to the cell nucleus, to allow for ciliogenesis (PubMed:27623382). Contributes to centrosome cohesion before mitosis (PubMed:16203858). {ECO:0000250|UniProtKB:Q8CJ40, ECO:0000269|PubMed:16203858, ECO:0000269|PubMed:27623382}. This is the function of CROCC (ciliary rootlet coiled-coil, rootletin, Ensembl gene identifier ENSG00000058453).