Involved in spermatogenesis and sperm function. Plays a role in regulation of cell growth (By similarity). Binds to double-stranded DNA and RNA (By similarity). Binds most efficiently to poly(I:C) RNA than to poly(dI:dC) DNA (By similarity). Binds also to single-stranded poly(G) RNA (By similarity). Binds non-specifically to the mRNA PRM1 3'-UTR and adenovirus VA RNA. Interacts with EIF2AK2 (By similarity). Associates with microtubules; it is unsure whether such interaction is direct or indirect. Microtubule-associated that localizes to the manchette in developing spermatids. Isoform 2 is expressed in spermatocytes (at protein level). Expressed in testis, thymus, ovary, liver, kidney, heart, spleen and brain. Expressed in cortex, dentate gyrus and Purkinje cell layer and granule cells of the cerebellum. Expressed in brain at 13.5 dpc. Expressed in brain, trigeminal ganglia and nasal epithelium at 18.5 dpc.