NCIt definition : Human PNP wild-type allele is located in the vicinity of 14q13.1 and is approximately
8 kb in length. This allele, which encodes purine nucleoside phosphorylase protein,
plays a role in the release of a purine from a purine nucleoside. Certain allelic
variants of the PNP gene cause nucleoside phosphorylase deficiency, resulting in severe
T-cell immunodeficiency with neurologic disorder in children.;