Enables uracil DNA N-glycosylase activity. Involved in base-excision repair and negative regulation of apoptotic process. Located in mitochondrion. Human ortholog(s) of this gene implicated in dysgammaglobulinemia and immunodeficiency with hyper IgM type 5. Orthologous to human UNG (uracil DNA glycosylase). [provided by Alliance of Genome Resources, Apr 2022]