A 4-year-old girl with arginosuccinic-aciduria exhibited mental retardation, seizures, ataxia, and abnormal hair. Fasting and postprandial ammonia and blood urea nitrogen levels were maintained within normal limits. The mechanism of urea synthesis, in the face of an apparent enzymic block in the Krebs-Henseleit (urea) cycle, remains unknown. Physical indexes of hair strength were measured directly, and found to be markedly reduced. A diagnosis of trichorrexis nodosa was not established, but the cystine content of the hair was significantly reduced. The cause of the neurological features associated with this amino acid disorder remain speculative.
Potter JL, Timmons GD, West R, Silvidi AA. Arginosuccinicaciduria: The Hair Abnormality. Am J Dis Child. 1974;127(5):724–727. doi:10.1001/archpedi.1974.02110240110017
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