Viral Paget's disease may be caused by a slow virus infection (i.e., paramyxoviridae) present for many years before symptoms appear. Associated viral infections include respiratory syncytial virus, canine distemper virus, and the measles virus. However, recent evidence has cast some doubt upon the measles association. Laboratory contamination may have played a role in past studies linking paramyxovirus (e.g. measles) to Paget's disease. Genetic There is a hereditary factor in the development of Paget's disease of bone. Two genes, SQSTM1 and RANK, and specific regions of chromosome 5 and 6 are associated with Paget's disease of bone. Genetic causes may or may not involve a family history of Paget's disease. About 40–50% of people with the inherited version of Paget's disease have a mutation in the gene SQSTM1, which encodes a protein, called p62, that is involved in regulating the function of osteoclasts (bone cells). However, about 10-15 percent of people that develop the disease without any family history also have a mutation in the SQSTM1 gene. Paget's disease of bone is associated with mutations in RANK. Receptor Activator of Nuclear Factor κ B (RANK), which is a type I membrane protein that is expressed on the surface of osteoclasts and is involved in their activation upon ligand binding. Additional genetic associations include: Name OMIM Locus Gene PDB1 6p ? PDB2 18q22.1 RANK PDB3 5q35 SQSTM1 PDB4 5q31 ?
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