Isolated fragments of the HFE2A protein able to bind and modulate HFE2A and other proteins, such as hepcidin, involved in the iron metabolism pathway are disclosed. Also disclosed are corresponding isolated polynucleotides encoding the fragments of the HFE2A protein. Methods for identifying modulators of HFE2A, comprising contacting a test compound with HFE2A and determining a change in HFE2A activity due to the compound, are provided. Also taught are methods of diagnosing an animal afflicted with or at risk of developing a disease of iron metabolism. Methods for treating and/or preventing a disorder in animals comprising administering to an animal afflicted therewith, or at risk of developing said disorder, a therapeutically effective amount of an HFE2A modulator are provided.
