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• W4385814082 endingPage "107685" @default.
• W4385814082 startingPage "107685" @default.
• W4385814082 abstract "The mucopolysaccharidoses (MPS) are a family of inborn errors of metabolism resulting from a deficiency in a lysosomal hydrolase responsible for the degradation of glycosaminoglycans (GAG). From a biochemical standpoint, excessive urinary excretion of GAG has afforded first-tier laboratory investigations for diagnosis whereas newborn screening programs employ lysosomal hydrolase measurements. Given false positives are not uncommon, second-tier diagnostic testing relies on lysosomal hydrolase measurements following elevated urinary GAG, and newborn screening results are often corroborated with GAG determinations. Molecular genetics requires acknowledgement as identifying pathogenic variants in the hydrolase genes confirms the diagnosis and allows cascade testing for families, but genetic variants of uncertain significance complicate this paradigm. Initiating cellular, tissue and organ damage that leads to an MPS phenotype is undoubtedly the accumulation of partially degraded GAG, and with mass spectrometry technologies now readily available in the biochemical genetics' laboratory, the ability to properly measure these GAG fragments has been realized. The most common approach involves bacterial lyase/hydrolase digestion of the long chain GAG polymers into their disaccharide units that can be measured by mass spectrometry. Another, less well-known method, the endogenous non-reducing end method, does not require depolymerization of GAG but rather relies on the mass spectrometric measurement of the naturally produced oligosaccharides that arise from the enzyme deficiency. All MPS can be identified by this one method, and evidence to date shows it to be the only GAG analysis method that gives no false positives when employed as a first-tier laboratory diagnostic test and second-tier newborn screening test." @default.
• W4385814082 created "2023-08-15" @default.
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• W4385814082 date "2023-11-01" @default.
• W4385814082 modified "2023-10-17" @default.
• W4385814082 title "Endogenous, non-reducing end glycosaminoglycan biomarkers for the mucopolysaccharidoses: Accurate diagnosis and elimination of false positive newborn screening results" @default.
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• W4385814082 doi "https://doi.org/10.1016/j.ymgme.2023.107685" @default.
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