Enables deoxyadenosine kinase activity and deoxyguanosine kinase activity. Acts upstream of or within dGTP metabolic process and protein phosphorylation. Located in cytosol and mitochondrion. Is expressed in central nervous system and retina. Human ortholog(s) of this gene implicated in autosomal recessive progressive external ophthalmoplegia with mitochondrial DNA deletions 4; mitochondrial DNA depletion syndrome 3; mitochondrial metabolism disease; and portal hypertension. Orthologous to human DGUOK (deoxyguanosine kinase). [provided by Alliance of Genome Resources, Apr 2022]