Enables thiamine diphosphokinase activity. Acts upstream of or within thiamine metabolic process. Is expressed in several structures, including early conceptus; gonad; heart; liver; and metanephros. Human ortholog(s) of this gene implicated in inherited metabolic disorder. Orthologous to human TPK1 (thiamin pyrophosphokinase 1). [provided by Alliance of Genome Resources, Apr 2022]