Victor Forge
Muscle degenerative diseases, also known as neuromuscular diseases, are conditions that affect the nerve, muscle, or neuromuscular junction. These diseases cause weakness and degeneration of the skeletal muscles, leading to a loss of strength and increasing disability. Some common muscle degenerative diseases include muscular dystrophy, motor neuron disease, myopathy, and peripheral nerve diseases. Muscular dystrophy, for example, is a group of inherited diseases that cause weakness and wasting away of muscle tissue, with Duchenne muscular dystrophy being the most common form. While there may be no cure for some of these diseases, early diagnosis and appropriate treatment are crucial for managing symptoms and improving quality of life.
| Characteristics | Values |
|---|---|
| Types of Muscle Degenerative Diseases | Muscular Dystrophy, Motor Neuron Disease, Mitochondrial Diseases, Myopathy, Neuromuscular Junction Disorders, Peripheral Nerve Diseases, Congenital Muscular Dystrophy, Myotonic Muscular Dystrophy, Facioscapulohumeral Muscular Dystrophy, Limb-Girdle Muscular Dystrophy, Duchenne Muscular Dystrophy, Becker Muscular Dystrophy |
| Causes | Genetic mutations, abnormal genes, inherited, immune system disorders, infection |
| Symptoms | Muscle weakness, muscle wasting, loss of muscle mass, muscle pain, muscle twitching, cramps, difficulty walking, loss of sensation in the extremities, trouble using arms, respiratory failure, progressive muscle degeneration, fatigue, difficulty swallowing |
| Treatments | Medications, therapy, surgery, physical therapy, occupational therapy, lifestyle changes (regular exercise, balanced diet, managing stress, avoiding overexertion) |
| Other | There is no cure for most muscle degenerative diseases. |
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What You'll Learn
Duchenne muscular dystrophy
DMD is the most common type of muscular dystrophy, affecting around one in 3,500 to 6,000 males at birth in the US, or 17 to 29 per 100,000 US male births. Globally, it has been reported to be a rare disease, with an occurrence of around 6 to 7.1 per 100,000 male births. DMD usually affects boys, but in rare cases, it can affect girls. The median life expectancy is 27 to 31 years, but with comprehensive care, some individuals may live into their 30s or 40s.
The onset of muscle weakness in DMD typically begins around age four, with rapid progression. Initially, muscle loss occurs in the thighs and pelvis, extending to the arms, which can lead to difficulties in standing up. Signs usually appear before age five and may even be observed when a boy takes his first steps. There is a general difficulty with motor skills, resulting in an awkward manner of walking, stepping, or running. A classic sign of DMD is trouble getting up from a lying or sitting position, as manifested by a positive Gower's sign. By the age of 12, most individuals with DMD are unable to walk, and by the age of 21, most are essentially "paralysed from the neck down".
DMD is caused by a mutation in the dystrophin gene, located on the short arm of the X chromosome. This mutation results in a large reduction or absence of dystrophin, a protein that provides structural integrity to muscle cells. Dystrophin is responsible for connecting the actin cytoskeleton of each muscle fibre to the underlying basal lamina through a protein complex. The progression of DMD differs for each person, even among siblings with the same mutation. While the average age of diagnosis is around four years old, delays in early developmental milestones such as sitting, walking, and talking may be observed.
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Motor neuron disease
MND can affect a person's life in many ways, and as the disease progresses, they may experience difficulty moving and speaking, and may require a wheelchair. They may also need a ventilator to help with breathing and assistive technology for speech. MND can be difficult to diagnose in the early stages, but as the symptoms worsen, it can usually be confirmed. There is currently no cure for MND, but treatments can help manage the symptoms and improve quality of life. The drug riluzole, for example, has been shown to prolong survival and may help people remain in the milder phase of the disease for longer.
The physical effects of MND can include emotional lability, where a slight upset can cause an exaggerated response, such as crying or laughing. It was initially believed that MND only affected the nerve cells controlling the muscles, but it is now known that up to 50% of people with MND experience changes in cognition, language, behaviour, and personality. While the exact causes of MND are unknown, it is thought that a combination of certain genes and other factors are involved. About 1 in 10 people with MND have a family history of the condition, and several gene mutations have been identified.
There are four main types of MND, each affecting different parts of the body, particularly during the early stages. Amyotrophic lateral sclerosis (ALS) is the most common type, and it can affect both adults and children. In children, MNDs are typically caused by specific gene mutations, as in spinal muscular atrophy. Primary lateral sclerosis (PLS) is another form of MND that affects only the upper motor neurons, causing difficulty and slowness in the movements of the arms, legs, and face. PLS progresses slowly over years or decades and is more common in men than in women, with an onset generally occurring between the ages of 40 and 60.
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Mitochondrial diseases
Diagnosis of mitochondrial diseases involves a comprehensive evaluation, including a review of medical and family history, physical, neurological, and metabolic examinations, DNA testing, and various specialized tests depending on the affected organs or systems. While there is currently no cure for mitochondrial diseases, treatments such as physical therapy, vitamins, special diets, and medications can help manage symptoms and prevent life-threatening complications.
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Myotonic muscular dystrophy
There are various types of muscle degenerative diseases, collectively known as muscular dystrophies. These are a group of inherited diseases that cause weakness and degeneration of the skeletal muscles.
Myotonic dystrophy (DM) is a form of muscular dystrophy that affects muscles and other organs in the body. It is characterised by an inability to relax muscles following contractions, known as myotonia. Facial and neck muscles are usually the first to be affected, and people with this form of the disease typically have long, thin faces; drooping eyelids; and swan-like necks. DM is the most common muscular dystrophy in people of European ancestry, affecting at least one in 8,000 people worldwide. However, the prevalence varies among different geographic and ethnic populations.
There are two types of myotonic dystrophy: Type 1 DM (DM1) and Type 2 DM (DM2). DM1, also known as Steinert disease, occurs when a gene on chromosome 19 called DMPK contains an abnormally expanded section located close to the regulation region of another gene, SIX5. DM2, recognised in 1994 as a milder version of DM1, is caused by an abnormally expanded section in a gene on chromosome 3 called ZNF9. DM2 was originally called PROMM (proximal myotonic myopathy), a term that is still occasionally used.
The symptoms of myotonic dystrophy include muscle atrophy (wasting) and muscle weakness, which get progressively worse over time. Myotonia is the main initial symptom, and it improves with repeated exercise but is worsened by exposure to cold. In addition to musculoskeletal weakness, cardiac conduction defects and early cataracts are also common. There is currently no cure for myotonic dystrophy, but certain treatments and therapies can help manage symptoms and improve quality of life.
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Facioscapulohumeral muscular dystrophy
There are indeed muscle degenerative diseases, and muscular dystrophy is one of them. Muscular dystrophy is a group of diseases that cause muscle weakness and wasting away of muscle tissue. While there are several types of muscular dystrophy, this answer will focus on Facioscapulohumeral Muscular Dystrophy (FSHD).
The muscle weakness associated with FSHD gradually worsens over decades and may spread to other parts of the body, including the lower legs, hips, and pelvis. In some rare cases, FSHD can also affect the heart muscle and the muscles required for breathing. Approximately 20% of individuals with FSHD will eventually require the use of a wheelchair.
FSHD is caused by genetic changes involving the long (q) arm of chromosome 4, specifically in a region of DNA near the end of the chromosome known as D4Z4. This region typically has a large number of methyl groups, but in individuals with FSHD, there is a shortage of these groups, resulting in the DUX4 gene being activated when it normally would not be. There are two types of FSHD, Type 1 (FSHD1) and Type 2 (FSHD2), which are distinguished by their genetic causes. FSHD1 accounts for about 95% of cases, while FSHD2 accounts for the remaining 5%.
While there is currently no cure for FSHD, medications and therapy can help manage symptoms and slow the progression of the disease.
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Frequently asked questions
Muscular dystrophy is a group of inherited diseases that cause progressive weakness and loss of muscle mass. There are more than 30 types of muscular dystrophy, and all forms grow worse over time as muscles degenerate and weaken. The most common type is Duchenne muscular dystrophy, which usually occurs in young boys.
The symptoms of muscular dystrophy vary depending on the type, but they typically include progressive muscle weakness, wasting away of muscle tissue, and possible deformity. Some people with muscular dystrophy experience trouble walking, difficulty using their arms, and shortening of muscles or tendons around joints.
There is currently no cure for muscular dystrophy, but medications and therapy can help manage symptoms and slow the course of the disease. Treatment options include physical therapy, occupational therapy, and, in some cases, surgery. Lifestyle changes, such as regular exercise, a balanced diet, and managing stress, can also help improve overall well-being.
In addition to muscular dystrophy, other muscle degenerative diseases include motor neuron disease, myotonic muscular dystrophy, mitochondrial diseases, myopathies, and peripheral nerve diseases. These diseases can cause muscle weakness, paralysis, and, in severe cases, respiratory failure.
