Hartnup disorder is a hereditary condition in which there is an issue in the transport of specific amino acids by the small intestinal tract and kidneys. Hartnup disorder is a metabolic problem involving amino acids. A child should inherit a copy of the faulty gene from both parents in order to be seriously affected. Diarrhea; Mood changes; Nervous system troubles, such as abnormal muscle tone and uncoordinated activities; Red, scaly skin rash, usually when skin is subjected to sunlight; Sensitivity to light; Short stature;.
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