File:Autorecessive.svg<unk>  (also known as "pellagra-like dermatosis" and<unk>  disorder") is an autosomal recessive metabolic disorder affecting the absorption of nonpolar amino acids (particularly tryptophan that can be, in turn, converted into serotonin, melatonin, and niacin). Niacin is a precursor to nicotinamide, a necessary component of NAD+.:541
The causative gene, SLC6A19, is located on chromosome 5.
Hartnup Disease
Tropical sprue
Primary Intestinal Lymphangiectasia
Gum disease
Meckel's diverticulum
Duodenal diverticulum
Hirschsprung's disease
Vesicointestinal fistula