MSP1 (OMIM #167320, also called Inclusion bodies myopathy with Paget's disease of bone and frontotemporal dementia, IBMPFD) is an autosomal dominant disorder, meaning a single copy of the altered gene from either parent is sufficient to cause the disease. The gene discussed is ATAD1; the disease is inclusion body myopathy with Paget disease of bone and frontotemporal dementia.