Abstract
Organic acid disorders (OAD) are a relevant group of inborn errors of metabolism (IEM), not only in severely ill children but in adults as well, namely, with neurological symptoms. OAD are due to defect in intermediary metabolic pathways of carbohydrate, amino acids, lipids, Krebs cycle, vitamins, and nucleic acids, leading to the accumulation in the body fluids of the so-called organic acids, the metabolic pathways’ intermediates. Analysis of organic acids profiles is a powerful tool for the IEM differential diagnosis. Herein, an updated reference guide in OAD is presented, incorporating the affected protein, the altered gene, and the organic acids with diagnostic value. Valuable clues for the correct interpretation of an organic acids profile are discussed with focus on some puzzling organic acids and on the artefacts arising from diet, gut bacterial action, drugs, and sample bacterial contamination.
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Acknowledgments
The authors deeply acknowledge the contribution of Dr. Marinus Duran to the Organic Acids chapter in the previous edition (2014, pp 761–773) of this book, on which this chapter is based.
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Tavares de Almeida, I., Ribes, A. (2022). Organic Acids. In: Blau, N., Dionisi Vici, C., Ferreira, C.R., Vianey-Saban, C., van Karnebeek, C.D.M. (eds) Physician's Guide to the Diagnosis, Treatment, and Follow-Up of Inherited Metabolic Diseases. Springer, Cham. https://doi.org/10.1007/978-3-030-67727-5_4
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