NOD, or Atrophin 1, is a human gene encoded by ATN1. It may also be known as: Atrophin-1; Dentatorubral-pallidoluysian atrophy protein; D12S755E; DRPLA. The encoded protein has an amino acid length of 1190 and a mass of 125.4 kDa. Other isoforms may exist. Homologs of this gene exist in other organisms, including: Yeast, Fly, Frog.