Predicted to enable guanyl-nucleotide exchange factor activity. Acts upstream of or within spermatogenesis. Predicted to be located in nuclear body. Predicted to be active in cytoplasm and membrane. Is expressed in craniocervical region bone; nervous system; and neural retina. Human ortholog(s) of this gene implicated in Charcot-Marie-Tooth disease type 4B3. Orthologous to human SBF1 (SET binding factor 1). [provided by Alliance of Genome Resources, Apr 2022]