Victor Forge
Muscular dystrophy (MD) is a group of more than 30 genetic diseases that cause progressive muscle degeneration and weakness, affecting mobility and the ability to perform daily activities. MD is caused by mutations in genes responsible for healthy muscle structure and function, interfering with the production of proteins that strengthen and protect muscles. The disease can affect multiple body tissues and organs, including the heart, lungs, and brain, and currently has no cure. MD is not contagious and is typically inherited, though it can also be the result of spontaneous gene mutations. Symptoms of MD vary in severity and generally worsen over time, with treatment focusing on managing symptoms and slowing the course of the disease.
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What You'll Learn
- Muscular dystrophy is a group of more than 30 genetic diseases that cause progressive muscle weakness
- The most common types are Duchenne, Becker, congenital, facioscapulohumeral, and myotonic
- The disease is caused by mutations in genes that affect muscle proteins
- Symptoms include trouble walking, swallowing, breathing, and speaking
- There is no cure, but treatments can help manage symptoms and slow the disease's progression
Muscular dystrophy is a group of more than 30 genetic diseases that cause progressive muscle weakness
Muscular dystrophy (MD) is a group of more than 30 genetic diseases that cause progressive muscle degeneration and weakness. The diseases affect the body's ability to produce proteins that protect and strengthen muscles, causing them to weaken and degenerate over time. MD can affect people of all ages, races, and sexes, although certain types of MD are more prevalent in specific demographics. For example, Duchenne muscular dystrophy is the most common form of MD in young boys, while myotonic dystrophy is the most common form diagnosed in adulthood and affects men and women equally.
MD is caused by mutations in genes responsible for healthy muscle structure and function. These mutations can be inherited, with most cases resulting from spontaneous gene mutations not present in either parent but passable to the next generation. In some cases, individuals with MD may be the first in their family to have the disease. MD can also be caused by defects in the dystrophin-glycoprotein complex, which is a group of proteins that prevent damage to muscle fibers during contraction and relaxation. When this protective membrane is damaged, muscle fibers begin to leak creatine kinase and take on excess calcium, leading to their eventual death and progressive muscle degeneration.
The symptoms of MD vary depending on the specific type but generally include progressive muscle weakness, atrophy, and movement-related issues such as difficulty walking, climbing stairs, or running. MD can also affect muscles that help with breathing and heart function, leading to cardiac and respiratory issues. Some types of MD also impact other organs, including the lungs, gastrointestinal system, endocrine glands, spine, eyes, brain, or other organs. The severity of symptoms can vary, with some forms of MD causing mild and slow-progressing symptoms, while others lead to rapid muscle weakness and physical disability.
While there is currently no cure for MD, treatments are available to help manage symptoms and slow the course of the disease. These treatments include medications, physical therapy, occupational therapy, respiratory care, speech therapy, assistive devices, and surgery for associated conditions. Support groups and organisations also provide emotional support and advice for individuals affected by MD.
MD is relatively rare, affecting about 16 to 25 per 100,000 people in the US when combining all types. However, the incidence of specific forms of MD varies, with some types being more common than others and certain forms being more prevalent in specific countries and regions.
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The most common types are Duchenne, Becker, congenital, facioscapulohumeral, and myotonic
Muscular dystrophy (MD) is a group of inherited muscle diseases that cause progressive weakness and degeneration of skeletal muscles. There are more than 30 types of muscular dystrophy, and the most common types are Duchenne, Becker, congenital, facioscapulohumeral, and myotonic.
Duchenne muscular dystrophy (DMD) is the most common form of muscular dystrophy, affecting mostly boys, but girls can also have a milder version of it. DMD is caused by a lack of a skeletal muscle membrane protein called dystrophin. As DMD progresses, it affects the heart and lungs. Becker muscular dystrophy (BMD) is the second most common type and is very similar to DMD, but it progresses much more slowly and is less common. BMD affects boys and usually develops between the ages of 11 and 25. Both Duchenne and Becker muscular dystrophies have an X-linked inheritance pattern, which means that a mutation on the X chromosome causes the condition.
Congenital muscular dystrophies (CMD) are a group of more than 30 types of muscular dystrophy affecting both boys and girls. CMD is apparent at birth or before the age of two. Some forms progress slowly and cause only mild disability, while others progress rapidly and cause severe impairment. Those with CMD may experience overall muscle weakness, joint stiffness or looseness, spinal curvature (scoliosis), breathing issues, intellectual disabilities, learning disabilities, eye issues, or seizures.
Facioscapulohumeral muscular dystrophy (FSHD) affects the muscles in the face, shoulders, and upper arms. FSHD symptoms usually begin before the age of 20, and about 4 out of 100,000 people in the US have this form. People with FSHD first have weakness in the muscles around the eyes and mouth, and later, the abdominal and hip muscles become weak as well.
Myotonic dystrophy is the most common type of muscular dystrophy diagnosed in adulthood, affecting men and women equally. People with myotonic dystrophy have difficulty relaxing their muscles after using them. The condition can also affect the heart and lungs and may cause endocrine issues, such as thyroid disease and diabetes.
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The disease is caused by mutations in genes that affect muscle proteins
Muscular dystrophy (MD) is a group of genetic diseases that cause progressive weakness and degeneration of skeletal muscles. It refers to more than 30 disorders that vary in age of onset, severity, and the pattern of the affected muscles. MD is caused by mutations in genes that affect muscle proteins.
Certain genes are involved in making proteins that protect muscle fibres. Muscular dystrophy occurs when one of these genes is defective. Each form of muscular dystrophy is caused by a genetic mutation particular to that type of the disease. Most of these mutations are inherited. The most common variety, Duchenne muscular dystrophy (DMD), usually occurs in young boys. DMD results from an absence of the muscle protein dystrophin.
The muscle fibre membrane contains a group of proteins, known as the dystrophin-glycoprotein complex, that prevent damage when muscle fibres contract and relax. When this protective membrane is damaged, muscle fibres begin to leak the protein creatine kinase and take on excess calcium. This damages the muscle fibres and eventually causes them to die, leading to progressive muscle degeneration.
In the majority of muscular dystrophy cases, the individual inherits the genetic mutation from one or both of their biological parents. However, many cases are caused by spontaneous gene mutations that are not present in either parent of the person with MD but can be passed to the next generation.
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Symptoms include trouble walking, swallowing, breathing, and speaking
Muscular dystrophy is a group of diseases that cause progressive weakness and loss of muscle mass due to abnormal genes interfering with the production of proteins needed to form healthy muscle. The most common variety, Duchenne, usually occurs in young boys, but the disease can affect both sexes and all ages and races. While there is no cure for muscular dystrophy, medications and therapy can help manage symptoms and slow the course of the disease.
Muscular dystrophy can cause trouble walking due to progressive muscle weakness. People with this disease might have difficulty lifting the front part of the foot and thus may trip frequently. They may also experience increased clumsiness and falling and eventually need to use a wheelchair.
The disease can also cause difficulty swallowing (dysphagia), which is a symptom of many different conditions, including nervous system and brain disorders, muscle disorders, and physical blockages in the throat. Dysphagia can cause discomfort and slow down the act of swallowing, leading to coughing or choking when trying to swallow water, food, or even saliva.
In addition, muscular dystrophy can lead to breathing problems. Dysarthria, or slurred speech, occurs when there is damage to the parts of the nervous system that control the muscles involved in breathing and speaking. This can cause speech to sound breathy and nasal.
Finally, muscular dystrophy can cause speaking difficulties. Dysarthria can also result from damage to the upper neurons on one side or both sides of the brain, leading to strained or harsh-sounding speech. Ataxic dysarthria, caused by damage to the cerebellum, can make it hard to pronounce vowels and consonants and to place emphasis on the right parts of a word. Hypokinetic dysarthria, caused by damage to the basal ganglia, can also impair muscle movement necessary for speaking.
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There is no cure, but treatments can help manage symptoms and slow the disease's progression
While there is currently no cure for muscular dystrophy, treatments can help manage symptoms and slow the progression of the disease. Muscular dystrophy (MD) is a group of over 30 genetic diseases that cause progressive muscle weakness and atrophy. The disease interferes with the production of proteins needed to form healthy muscle tissue. The symptoms of MD vary depending on the type but generally get worse over time.
The most common type of MD is Duchenne muscular dystrophy (DMD), which affects approximately 1 in 3,500 male births. DMD causes rapid muscle wasting and progressive weakness from early childhood, and most children with the condition use a wheelchair by age 12. Other common types of MD include Becker muscular dystrophy (BMD), myotonic dystrophy, and oculopharyngeal muscular dystrophy (OPMD). BMD is similar to DMD but progresses more slowly and appears later, while myotonic dystrophy is the most common adult-onset form, usually appearing between the ages of 20 and 30. OPMD weakens the muscles in the eyelids and throat, with symptoms often appearing in the 40s or 50s.
Treatments for MD aim to slow the progression of the disease and improve a person's quality of life. Physical therapy, starting in the earliest stages of MD, can help maintain muscle strength and flexibility and prevent joint stiffness. Certain medications can also slow the progression of the condition and improve a person's mobility. In addition, researchers are working on developing gene therapies that may provide hope for people with certain types of MD.
The Muscular Dystrophy Association provides emotional, physical, and financial support to people living with MD. It is important for individuals diagnosed with MD to understand how to manage the condition and prevent or manage complications that may arise over time.
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Frequently asked questions
Muscle dystrophy (MD) is a group of more than 30 genetic diseases that cause progressive weakness and degeneration of skeletal muscles. MD is caused by changes in over 40 genes that affect muscle proteins.
The symptoms of MD vary depending on the type but the main symptom is muscle weakness and other muscle-related issues. Some other symptoms include trouble swallowing, heart problems, scoliosis, breathing issues, intellectual disabilities, and learning disorders. Many people with MD eventually lose the ability to walk.
There are many different types of MD, some of the more common types include:
- Duchenne muscular dystrophy
- Becker muscular dystrophy
- Congenital muscular dystrophies
- Facioscapulohumeral muscular dystrophy
- Myotonic dystrophy
