Athena Vale
Muscular dystrophy (MD) is a group of more than 30 genetic diseases that cause progressive weakness and degeneration of skeletal muscles. MD is caused by mutations in the genes responsible for healthy muscle structure and function. These mutations are usually inherited from one or both parents but can also occur spontaneously. The mutations affect the cells that maintain muscles, leading to progressive muscle weakness and loss of function. While there is currently no cure for MD, treatments such as physical therapy and gene therapy aim to manage symptoms and improve patients' quality of life.
| Characteristics | Values |
|---|---|
| Cause | Mutations (changes) in the genes that are responsible for healthy muscle structure and function |
| Gene Mutation | The mutated DMD gene fails to produce functional dystrophin |
| Inheritance | Can be inherited from one or both parents; can also occur spontaneously |
| Types | Myotonic, Facioscapulohumeral (FSHD), Congenital, Limb-girdle, Duchenne, Becker, Dominant inherited, Recessive inherited, Sex-linked (X-linked) |
| Symptoms | Progressive muscle weakness, breathing problems, curved spine (scoliosis), heart problems, swallowing problems |
| Diagnosis | Creatine kinase blood test, genetic tests, muscle biopsy, electromyography (EMG) |
| Treatment | Physical and occupational therapies, gene therapy |
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What You'll Learn
Muscular dystrophy is caused by gene mutations
Muscular dystrophy (MD) is a group of more than 30 genetic conditions that cause muscle weakness and other muscle-related symptoms. It is caused by mutations (alterations) in the genes responsible for healthy muscle structure and function. These mutations interfere with the production of proteins needed to form healthy muscle. The mutations mean that the cells that should maintain muscles can no longer do so, leading to progressive muscle weakness and loss of muscle mass.
MD is usually inherited, with faulty genes passed on from one or both parents. In rare cases, it can also occur spontaneously due to a de novo mutation. There are three ways MD can be inherited: recessive inheritance, dominant inheritance, and X-linked inheritance. In recessive inheritance, the mutated gene must be inherited from both parents. In dominant inheritance, inheriting the mutated gene from just one parent is enough for the child to develop the condition. In X-linked inheritance, a mutation on the X chromosome causes the condition. Genetically male people (with one X and one Y chromosome) will develop the condition if one of the genes on their X chromosome is mutated, while females (with two X chromosomes) can have milder symptoms or be carriers of the disease.
The different types of MD include myotonic dystrophy, facioscapulohumeral MD, oculopharyngeal MD, limb-girdle MD, and Duchenne and Becker muscular dystrophies. Symptoms of MD usually begin in childhood, mostly in boys, but can also appear in adulthood. The specific signs and symptoms depend on the type of MD and the affected muscle groups. Some common symptoms include progressive muscle weakness, breathing problems, curved spine (scoliosis), heart problems, and swallowing difficulties.
While there is currently no cure for MD, treatments such as medications and therapies can help manage symptoms and slow the progression of the disease. Researchers are also working on gene therapy vectors that can deliver genetic materials to cells and improve muscle function. The first gene therapy for MD was approved by the FDA in 2023, and ongoing clinical trials are investigating its efficacy and durability.
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MD is inherited from one or both parents
Muscular dystrophy (MD) is a group of more than 30 genetic conditions that cause muscle weakness and other muscle-related symptoms. The symptoms of MD get worse over time, and there is currently no cure. MD is caused by mutations in the genes responsible for healthy muscle structure and function. These mutations are usually inherited from one or both parents but can also occur spontaneously.
MD is inherited from one parent in cases of dominant inheritance. This means that a person only needs to inherit the mutated gene from one parent to develop the condition. Types of MD that can be inherited in this way include myotonic dystrophy, facioscapulohumeral MD, oculopharyngeal MD, and some types of limb-girdle MD. In dominant inheritance, if a child has an unaffected partner, there is still a 50% chance of their child developing the condition.
MD is inherited from both parents in cases of recessive inheritance. This means that both matching genes must include a mutation to cause the disease. Some forms of limb-girdle muscular dystrophy are inherited in this way. If a child inherits an altered version of the gene from only one parent, they will become a carrier of the condition. This means they are not affected, but there is a chance that any children they have will be if their partner is also a carrier.
The inheritance pattern for many types of MD is called "X-linked recessive." This means that the genetic change is passed from one generation to the next through the X chromosome. In genetically male people, who have one X and one Y chromosome, the condition will develop if one of the genes on the X chromosome is mutated. In genetically female people, who have two X chromosomes, the symptoms of X-linked disorders are usually less severe. Duchenne and Becker muscular dystrophies have this type of inheritance.
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MD can also occur due to spontaneous mutations
Muscular dystrophy (MD) is a group of more than 30 genetic conditions that cause muscle weakness and other muscle-related symptoms. The symptoms of MD worsen over time, and there is currently no cure for the disease. The main goal of treatment is to manage symptoms and improve the patient's quality of life.
MD is caused by mutations (alterations) in the genes responsible for healthy muscle structure and function. These mutations interfere with the production of proteins needed to form healthy muscle. The mutations mean that the cells that should maintain muscles can no longer fulfill this role, leading to progressive muscle weakness and degeneration.
In most cases, MD runs in families and is inherited from one or both parents. However, in some rare cases, MD can also occur due to spontaneous mutations. These spontaneous mutations can then be inherited by the affected person's offspring. This type of mutation is called a de novo mutation and can occur randomly, without being inherited.
Spontaneous mutations can lead to different types of MD, each with its own unique features and symptoms. For example, myotonic MD is characterized by an inability to relax muscles following contractions, with facial and neck muscles usually being the first affected. Facioscapulohumeral MD (FSHD) also causes muscle weakness, typically beginning in the face, hips, and shoulders. On the other hand, congenital MD is apparent at birth or before the age of two and affects the child's ability to sit or stand without support.
The identification of spontaneous mutations that cause MD is crucial for developing effective treatments. Gene therapy vectors, for instance, are being refined to improve the delivery of genetic materials to cells, offering hope for individuals with MD resulting from spontaneous mutations.
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Duchenne and Becker muscular dystrophies are X-linked
Muscular dystrophies are a group of more than 30 genetic conditions characterised by progressive muscle weakness and wasting (atrophy). The symptoms of muscular dystrophy worsen over time, and they can be present at birth, develop in childhood, or develop in adulthood.
Because it is unlikely that females will have two altered copies of this gene, males are affected by X-linked recessive disorders much more frequently than females. Fathers cannot pass X-linked traits to their sons, and in many cases, an affected male inherits the mutation from his mother, who carries one altered copy of the DMD gene.
Duchenne muscular dystrophy (DMD) is a genetic disorder characterised by progressive muscle degeneration and weakness due to alterations in a protein called dystrophin, which helps keep muscle cells intact. DMD is one of four conditions known as dystrophinopathies. The other three diseases that belong to this group are Becker muscular dystrophy (BMD, a mild form of DMD), an intermediate clinical presentation between DMD and BMD, and DMD-associated dilated cardiomyopathy (heart disease) with little or no clinical skeletal or voluntary muscle disease.
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There are over 30 types of MD
Muscular dystrophy (MD) is a group of more than 30 genetic conditions that cause muscle weakness and other muscle-related symptoms. MD is caused by mutations (alterations) in the genes responsible for healthy muscle structure and function. The mutations mean that the cells that should maintain the muscles can no longer do so, leading to progressive muscle weakness and disability. MD can be present at birth, develop in childhood, or develop in adulthood.
The most common form of MD in children is Duchenne muscular dystrophy (DMD), which typically affects only males. It usually appears between the ages of 2 and 6, and the muscles decrease in size and grow weaker over time. The disease progresses and often causes severe breathing and heart problems in the later stages. Many with DMD die in their late teens or early 20s.
Becker muscular dystrophy (BMD) is the second most common type of MD and is similar to DMD, but the disease is much milder, with symptoms appearing later and progressing more slowly. BMD usually appears between the ages of 2 and 16 but can appear as late as age 25. It typically affects only males, and like DMD, it can cause heart problems. However, people with BMD can usually walk into their 30s and live longer than those with DMD.
Another type of MD is limb-girdle muscular dystrophy, which causes progressive weakness that begins in the hips and moves to the shoulders, arms, and legs. It can also affect the heart. Limb-girdle MD can be inherited recessively, meaning that a person inherits a mutated gene from both parents, or dominantly, where the mutated gene is inherited from only one parent.
Facioscapulohumeral MD is another type of MD that affects the muscles that move the face, shoulder blade, and upper arm bone. It progresses slowly, with short periods of rapid muscle deterioration and weakness, and can range from very mild to completely disabling.
While there is currently no cure for MD, advances in treatments have improved life expectancy. The main goal of treatment is to manage symptoms and improve quality of life.
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Frequently asked questions
Yes, muscular dystrophy is a group of more than 30 genetic conditions that cause progressive weakness and degeneration of skeletal muscles. It is caused by mutations in the genes responsible for healthy muscle structure and function.
Muscular dystrophy develops when a mutated gene fails to produce functional dystrophin, a protein that transfers the force of muscle contraction from the inside of the muscle cell to the cell membrane. This results in progressive muscle weakness and loss of muscle mass.
Muscular dystrophy is usually inherited from one or both parents. There are three types of inheritance patterns: recessive inheritance, dominant inheritance, and sex-linked (X-linked) inheritance. In recessive inheritance, the mutated gene must be inherited from both parents. In dominant inheritance, inheriting the mutated gene from only one parent can cause the condition. In X-linked inheritance, a mutation on the X chromosome causes the condition.
Muscular dystrophy can be diagnosed through a variety of tests, including creatine kinase blood tests, genetic tests, muscle biopsies, and electromyography (EMG). Genetic tests can identify gene mutations linked to muscular dystrophy, while muscle biopsies involve examining muscle tissue under a microscope for signs of the disease.
