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Myofibrillar myopathy

Other Names for this Disease
  • Alpha Beta crystallinopathy (type)
  • Desmin related myopathy (former name)
  • Desmin storage myopathy (former name)
  • Desminopathy (type)
  • Filaminopathy (type)
More Names
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What is myofibrillar myopathy?

What are the signs and symptoms of myofibrillar myopathy?

What is myofibrillar myopathy?

Myofibrillar myopathies (MFM) are a group of neuromuscular disorders characterized by slowly progressive weakness that can involve both proximal muscles (such as hips and shoulders) and distal muscles (those farther away from the trunk). Some affected individuals also experience sensory symptoms, muscle stiffness, aching, or cramps. Peripheral neuropathy or cardiomyopathy may also be present.[1] Most people with MFM begin to develop muscle weakness in mid-adulthood, but features of the condition can appear anytime between infancy and late adulthood.[2] It may be caused by mutations in any of several genes, including DES, CRYABMYOT, LDB3, FLNC,  and BAG3;[1] the signs and symptoms of MFM can vary widely depending on the condition's genetic cause.[2] It is inherited in an autosomal dominant manner. Treatment may include a pacemaker and implantable cardioverter defibrillator (ICD) for arrhythmia or cardiac conduction defects; cardiac transplantation for progressive or life-threatening cardiomyopathy; respiratory support for respiratory failure; and physical therapy and assistive devices for those with advanced muscle weakness.[1]
Last updated: 3/18/2011

What are the signs and symptoms of myofibrillar myopathy?

Myofibrillar myopathy (MFM) primarily affects skeletal muscles, which are muscles that the body uses for movement. In some cases, the heart (cardiac) muscle is also affected. The signs and symptoms of MFM vary widely among affected individuals, typically depending on the condition's genetic cause. Most people with this disorder begin to develop muscle weakness (myopathy) in mid-adulthood. However, features of this condition can appear anytime between infancy and late adulthood. Muscle weakness most often begins in the hands and feet (distal muscles), but some people first experience weakness in the muscles near the center of the body (proximal muscles). Other affected individuals develop muscle weakness throughout their body. Facial muscle weakness can cause swallowing and speech difficulties. Muscle weakness worsens over time. Other signs and symptoms of MFM can include a weakened heart muscle (cardiomyopathy), muscle pain (myalgia), loss of sensation and weakness in the limbs (peripheral neuropathy), and respiratory failure. Individuals with this condition may have skeletal problems including joint stiffness (contractures) and abnormal side-to-side curvature of the spine (scoliosis). Rarely, people with this condition develop clouding of the front surface of the eyes (cataracts).[2]
Last updated: 3/18/2011

  1. Duygu Selcen, Andrew G Engel. Myofibrillar Myopathy. GeneReviews. July 27, 2010; Accessed 3/17/2011.
  2. Myofibrillar myopathy. Genetics Home Reference. January 2011; Accessed 3/17/2011.