Predicted to enable DNA-(apurinic or apyrimidinic site) endonuclease activity; nuclease activity; and nucleotide binding activity. Acts upstream of or within double-strand break repair and regulation of isotype switching. Predicted to be located in nucleoplasm. Predicted to be active in nucleus and site of double-strand break. Orthologous to human APLF (aprataxin and PNKP like factor). [provided by Alliance of Genome Resources, Apr 2022]