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Owing to limited awareness, relatively recent recognition, as well as considerable phenotypic variation, these disorders may often be misdiagnosed or remain undiagnosed. Disorders that arise as a result of dysfunction in PP metabolism represent some of the most challenging diagnostic problems in medicine. In addition to their low prevalence rates, they also present with extremely variable signs and symptoms. They may affect any system in a variety of manners, and often mimic other, more recognizable disorders. The diagnostic problem is compounded by the fact that some biochemically affected patients are symptom\u2010free. Rapidly evolving laboratory techniques such as high\u2010performance liquid chromatography coupled to tandem mass spectrometry are now well established as the preferred method for detection for these defects, but currently the most important step in diagnosis consists of suspecting the disorder. Diagnosis is vital because genetic counselling can be provided and, in some cases, specific treatment can be offered that may slow or even reverse clinical symptoms. If undiagnosed, these disorders can be devastating to patients and their families, resulting in early death or institutionalization for the rest of patient's life. This article describes the current state of knowledge about inborn errors of purine and pyrimidine metabolism, focusing on the varying clinical presentations, the laboratory findings and discusses indications for selective screening for these disorders.<\/jats:p>","DOI":"10.1007\/s10545-009-1094-z","type":"journal-article","created":{"date-parts":[[2009,3,16]],"date-time":"2009-03-16T14:57:31Z","timestamp":1237215451000},"page":"247-263","source":"Crossref","is-referenced-by-count":67,"title":["Inborn errors of purine and pyrimidine metabolism"],"prefix":"10.1002","volume":"32","author":[{"given":"A.","family":"Jurecka","sequence":"first","affiliation":[{"name":"Department of Metabolic Diseases, Endocrinology and Diabetology The Children's Memorial Health Institute Al. 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