Enables sodium:proton antiporter activity. Involved in several processes, including cellular response to electrical stimulus; cellular response to insulin stimulus; and regulation of apoptotic process. Located in several cellular components, including T-tubule; basolateral plasma membrane; and intercalated disc. Used to study cataract; middle cerebral artery infarction; and proteinuria. Biomarker of hyperthyroidism; hypothyroidism; renovascular hypertension; and type 2 diabetes mellitus. Human ortholog(s) of this gene implicated in autosomal recessive spinocerebellar ataxia 19 and congestive heart failure. Orthologous to human SLC9A1 (solute carrier family 9 member A1).
