May be an accessory component of axonemal dynein and cytoplasmic dynein 1. Candidate for involvement in male sterility. Interacts with CSNK2B. Found on the surface of sperm tail. Stored in cytoplasmic granules during spermatogenesis. Expressed in testis (at protein level). Expressed at the pachyten stage of the first meiotic division and in later haploid spermatogenic stages. Could be involved in transmission ratio distortion (trd) in mouse t-haplotype which causes male sterility. Belongs to the dynein light chain Tctex-type family.