Enables actin binding activity. Acts upstream of or within actin filament polymerization. Predicted to be located in endoplasmic reticulum and nucleolus. Is expressed in brain. Human ortholog(s) of this gene implicated in primary ovarian insufficiency and primary ovarian insufficiency 2A. Orthologous to human DIAPH2 (diaphanous related formin 2). [provided by Alliance of Genome Resources, Apr 2022]