Predicted to enable identical protein binding activity and virus receptor activity. Involved in several processes, including cellular response to butyrate; cellular response to cytokine stimulus; and endothelial cell development. Located in several cellular components, including apical plasma membrane; bicellular tight junction; and lateral plasma membrane. Biomarker of diabetic retinopathy; liver disease (multiple); non-alcoholic steatohepatitis; and periodontitis. Human ortholog(s) of this gene implicated in Crohn's disease and atopic dermatitis. Orthologous to human CLDN1 (claudin 1). [provided by Alliance of Genome Resources, Apr 2022]