Abstract
Disorders associated with the malfunction of amino acid transporters mainly affect the function of the intestine, kidney, brain, and liver. Mutations of brain amino acid transporters, for example, alter neuronal excitability. Examples presented in this chapter are episodic ataxia due to EAAT3 defect, hyperekplexia due to GLYT2 deficiency, global cerebral hypomyelination due to AGC1 deficiency, and neonatal myoclonic epilepsy due to GC1 deficiency. Mutations of renal and intestinal amino acid transporters cause renal problems (cystinuria and dicarboxylic aminoaciduria) and malabsorption that can affect whole-body homoeostasis (Hartnup disorder, lysinuric protein intolerance, and hyperdibasic aminoaciduria type 1). Inborn errors associated with the mitochondrial SLC25 family with a liver phenotype such as the ones affecting SLC25A13 (aspartate/glutamate transporter 2), citrin deficiency and SLC25A15 (ornithine–citrulline carrier 2), homocitrullinuria, hyperornithinemia, and hyperammonemia will be dealt with in Chap. 4.
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Acknowledgements
The authors thank Dr. Christian Lueck (Canberra Hospital) for clarification of differential diagnosis in cases of episodic ataxia. The authors thank Dr. Rafael Artuch (Hospital San Joan de Deu, Barcelona) for reference values of plasma amino acid concentration.
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PalacĂn, M., Broer, S. (2014). Amino Acid Transport Defects. In: Blau, N., Duran, M., Gibson, K., Dionisi Vici, C. (eds) Physician's Guide to the Diagnosis, Treatment, and Follow-Up of Inherited Metabolic Diseases. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-40337-8_6
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DOI: https://doi.org/10.1007/978-3-642-40337-8_6
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