Pellagra-like rash

Hartnup disease is a genetic amino acid metabolism disease, also known as hereditary niacin deficiency, or tryptophan oxygenase deficiency. It was first reported by Baron et al in 1956 in a family named Hartnup. The disease is due to intestinal mucosa and renal tubular epithelial cells transporting neutral amino acid disorders, clinical manifestations of pellagra-like rash, nervous system damage and amino acid urine.