Enables double-stranded DNA binding activity. Involved in positive regulation of lymphocyte differentiation. Acts upstream of or within DNA metabolic process; positive regulation of neurogenesis; and response to ionizing radiation. Located in cytoplasm and nucleus. Is expressed in several structures, including alimentary system; early conceptus; gonad; liver lobe; and telencephalon ventricular layer. Orthologous to human XRCC6 (X-ray repair cross complementing 6). [provided by Alliance of Genome Resources, Apr 2022]