Each column keeps its native condition scope. Initial features are displayed alphabetically, not ranked by clinical importance. Counts remain separate, and an empty cell does not mean a feature cannot occur.
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Ancestor membership does not transfer phenotype values between groups.","importantHtml":""},"sections":[{"bodyHtml":"Variants (also known as mutations) in the VCP gene are the main cause of IBMPFD. The VCP gene provides instructions for making an enzyme called valosin-containing protein, which has a wide variety of functions within cells. One of its most critical jobs is to help break down (degrade) proteins that are abnormal or no longer needed.
Variants in the VCP gene alter the structure of valosin-containing protein, impairing its ability to break down other proteins. As a result, excess and abnormal proteins build up in muscle, bone, and brain cells. The proteins form clumps that interfere with the normal functions of these cells. It remains unclear how damage to muscle, bone, and brain cells leads to the specific features of IBMPFD.
In individuals with IBMPFD who do not have identified VCP variants, the condition may be caused by rare variants in specific genes or remain unknown. IBMPFD is sometimes known as mutlisystem proteinopathy, often distinguished by its genetic cause. For example, when the condition is caused by VCP gene variants, it is called VCP-associated multisystem proteinopathy (VCP MSP).
","key":"forms","title":"What causes Inclusion body myopathy with early-onset Paget disease and frontotemporal dementia?"},{"bodyHtml":"The first symptom of IBMPFD is often muscle weakness (myopathy), which typically appears in mid-adulthood. Weakness first occurs in muscles of the hips and shoulders, making it difficult to climb stairs and raise the arms above the shoulders. As the disorder progresses, weakness develops in other muscles in the arms and legs. Muscle weakness can also affect respiratory and heart (cardiac) muscles, leading to life-threatening breathing difficulties and heart failure.
About half of all adults with IBMPFD develop a disorder called Paget disease of bone. This disorder causes bones to grow larger and weaker than normal.Paget disease of bone most often affects bones of the hips, spine, and skull, and the long bones of the arms and legs. Bone pain, particularly in the hips and spine, is usually the major symptom of Paget disease. Other complications of Paget disease of bone depend on which bones are affected.Rarely, this condition can weaken bones so much that they break (fracture).
In about one-third of people with IBMPFD, the disorder also affects the brain. IBMPFD is associated with a brain condition called frontotemporal dementia, which becomes noticeable in a person's forties or fifties. People with frontotemporal dementia initially may have trouble speaking, remembering words and names (dysnomia), and using numbers (dyscalculia). Over time, the condition damages parts of the brain that control reasoning, personality, social skills, speech, and language. Personality changes, loss of judgment, and inappropriate social behavior are also hallmarks of the disease. As the dementia worsens, affected people ultimately become unable to speak, read, or care for themselves.
Additional features that rarely occur in IBMPFD include a severe and progressive muscular disease called amyotrophic lateral sclerosis and progressive problems with movement and balance(Parkinson's disease).
People with IBMPFD usually live into their fifties or sixties.
Source: MedlinePlus Genetics
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