Becker muscular dystrophy (BMD) is a rare, inherited condition that causes muscle weakness that gets worse over time. It mainly affects males. There’s currently no cure for the condition, so treatment involves managing symptoms and optimizing quality of life.
Causes:
- Genetic: BMD is an X-linked recessive disorder, meaning it’s caused by a gene mutation on the X chromosome. Males inherit only one X chromosome from their mother, so if they inherit the mutated gene, they will develop BMD. Females can be carriers of the mutated gene but usually don’t experience symptoms.
- Dystrophin Protein: The mutated gene affects the production of dystrophin, a protein essential for muscle cell health. In BMD, the dystrophin protein is present but not functioning properly, leading to muscle weakness and degeneration.
Symptoms:
- Muscle Weakness: Symptoms typically start in the teenage years or early adulthood and progress slowly. Muscle weakness begins in the legs and pelvis and can spread to the shoulders, arms, and other muscles over time.
- Muscle Wasting: As muscles weaken, they may also become smaller in size.
- Difficulty Walking: Muscle weakness in the legs can make walking difficult, and individuals may require a wheelchair as the condition progresses.
- Muscle Pain and Cramps: Muscle pain and cramps can occur, especially after exercise.
- Heart Involvement: BMD can affect the heart muscle, leading to heart enlargement and potential heart failure.
- Respiratory Problems: In some cases, the muscles involved in breathing may weaken, leading to respiratory problems.