2p21 Microdeletion Syndrome Without Cystinuria, also known as del(2)(p21) without cystinuria, is related to cystinuria and hypotonia-cystinuria syndrome. An important gene associated with 2p21 Microdeletion Syndrome Without Cystinuria is CAMKMT (Calmodulin-Lysine N-Methyltransferase).