Enables thiamine transmembrane transporter activity. Involved in thiamine transmembrane transport. Acts upstream of or within thiamine transport. Located in plasma membrane. Is expressed in embryo; liver; and skeletal muscle. Used to study thiamine-responsive megaloblastic anemia syndrome. Human ortholog(s) of this gene implicated in diabetes mellitus; megaloblastic anemia; and thiamine-responsive megaloblastic anemia syndrome. Orthologous to human SLC19A2 (solute carrier family 19 member 2). [provided by Alliance of Genome Resources, Apr 2022]