Cystinuria, also known as csnu, is related to 2p21 microdeletion syndrome without cystinuria and hypotonia-cystinuria syndrome. An important gene associated with Cystinuria is SLC7A9 (Solute Carrier Family 7 Member 9), and among its related pathways/superpathways are Response to elevated platelet cytosolic Ca2+ and Transport of inorganic cations/anions and amino acids/oligopeptides. The drugs Penicillamine and Protective Agents have been mentioned in the context of this disorder. Affiliated tissues include Kidney and liver, and related phenotypes are abnormality of amino acid metabolism and nephrolithiasis