Diagnosis of inherited adenylosuccinase deficiency by thin-layer chromatography of urinary imidazoles and by automated cation exchange column chromatography of purines

Abstract

Patients with inherited adenylosuccinase deficiency excrete large quantities of succinyloaminoimidazolecarboxamide riboside (SAICAR) and Succinyloadenosine (SAdo). A two-dimensional thin-layer chromatography method for the detection of SAICAR is described. The method consists of (1) isolation of imidazoles with a cation exchange resin; (2) TLC on cellulose plates, solvent I, isopropanol-ammonia 10% (4:1) and II, butanol-acetic acid-water (4:1:1); detection with Pauly reagent. SAICAR gives rise to an isolated spot with a characteristic bluish color. Also a simple one-dimensional thin-layer chromatography method using urine without any pretreatment for screening of high risk populations is given. Four new cases could be diagnosed. Clinical and chemical data, including concentrations of SAICAR and SAdo in urine, plasma and cerebrospinal fluid, determined by cation exchange column chromatography, are presented.