Enables choline transmembrane transporter activity and creatine:sodium symporter activity. Involved in creatine transmembrane transport and embryonic brain development. Is active in glutamatergic synapse. Is integral component of postsynaptic membrane. Biomarker of status epilepticus. Human ortholog(s) of this gene implicated in creatine transporter deficiency and intellectual disability. Orthologous to human SLC6A8 (solute carrier family 6 member 8). [provided by Alliance of Genome Resources, Apr 2022]