ODF2 Gene - Structure, Function, and Clinical Significance

ODF2 (Outer Dense Fiber of Sperm Tails 2) encodes a protein that is a major component of the outer dense fibers (ODFs) of the sperm tail. ODFs are cytoskeletal structures that provide elasticity and structural integrity to the sperm flagellum, essential for motility. The protein also localizes to the centrosome in somatic cells and is involved in centrosome cohesion and microtubule organization. Alternative splicing generates multiple isoforms with distinct functions in spermatogenesis and ciliogenesis.

Tissue Expression

Cell Line Expression

Hotspot Mutations

Mutation functional classification

• Spermatogenesis (Reactome: R-HSA-1500931)

• Cilium assembly (Reactome: R-HSA-5617833)

• Centrosome maturation (Reactome: R-HSA-380259)

The ODF2 protein is a 84 kDa component of the outer dense fibers in the sperm flagellum, providing structural support and elasticity. It also localizes to the centrosome in somatic cells, where it contributes to centrosome cohesion and microtubule nucleation. The protein contains a coiled-coil domain that mediates self-association and interaction with other ODF components. Isoforms generated by alternative splicing have distinct roles: ODF2/1 is testis-specific and essential for sperm tail formation, while ODF2/2 is ubiquitously expressed and involved in centrosome function. Mutations in ODF2 are associated with male infertility and ciliopathies.