Predicted to enable FHA domain binding activity; identical protein binding activity; and protein C-terminus binding activity. Predicted to contribute to 3' overhang single-stranded DNA endodeoxyribonuclease activity. Involved in cellular response to lithium ion. Predicted to be located in chromosome, telomeric region; cytosol; and nucleoplasm. Predicted to be part of DNA ligase IV complex; DNA-dependent protein kinase-DNA ligase 4 complex; and ERCC4-ERCC1 complex. Predicted to be active in cytoplasm; nucleus; and site of double-strand break. Human ortholog(s) of this gene implicated in multiple myeloma. Orthologous to human XRCC4 (X-ray repair cross complementing 4). [provided by Alliance of Genome Resources, Apr 2022]