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- W1537111269 abstract "Glutaric aciduria type I (GA I) is a recessive disorder caused by a deficiency of glutaryl-CoA dehydrogenase (GCDH). The biochemical hallmark of the disease is the accumulation of glutaric acid and, to a lesser degree, of 3-hydroxyglutaric acid and glutaconic acid in body fluids and tissues. A substantial number of patients show only slightly, intermittently elevated or even normal urinary excretion of glutaric acid, which makes early diagnosis and treatment to prevent the severe neurological sequelae difficult. Furthermore, elevated urinary excretion of glutaric acid can also be found in a number of other disease states, mostly related to mitochondrial dysfunction. Stable-isotope dilution assays were designed for both glutaric acid and 3-hydroxyglutaric acid and their diagnostic sensitivity and specificity were evaluated. Control ranges of glutaric acid in urine were 1.1-9.7 mmol/mol creatinine before and 4.1-32 after hydrolysis. The respective values of 3-hydroxyglutaric acid were 1.4-8.0 and 2.6-11.7 mmol/mol creatnine. For other body fluids, control ranges in mumol/l/L were: for glutaric acid 0.55-2.9 (plasma), 0.18-0.63 (cerebrospinal fluid) and 0.19-0.7 (amniotic fluid); and for 3-hydroxyglutaric acid, 0.2-1.36 (plasma), < 0.2 (cerebrospinal fluid) and 0.22-0.41 (amniotic fluid). Twenty-five patients with GCDH deficiency were studied. Low excretors (12 patients) were defined by a urinary glutaric acid below 100 mmol/mol creatinine down into the normal range, while high excretors (13 patients) had glutaric acid excretions well above this value. With and without hydrolysis there was an overlap of glutaric acid values between patients and controls. Diagnostic sensitivity and specificity of 100% could only be achieved by the quantitative determination of 3-hydroxyglutaric acid with the newly developed stable-isotope dilution assay, allowing an accurate diagnosis of all patients, regardless of the amount of glutaric acid excreted in urine." @default.
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- W1537111269 title "Sensitivity and specificity of free and total glutaric acid and 3-hydroxyglutaric acid measurements by stable-isotope dilution assays for the diagnosis of glutaric aciduria type I" @default.
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- W1537111269 doi "https://doi.org/10.1023/a:1005683222187" @default.
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