The function of DYDC1 (DPY30 domain containing 1, ENSG00000170788) is as follows. Functions as part of axonemal radial spoke complexes that play an important part in the motility of sperm and cilia (By similarity). Plays a crucial role during acrosome biogenesis (PubMed:19545932). {ECO:0000250|UniProtKB:Q9D9T0, ECO:0000269|PubMed:19545932}.