Duchenne muscular dystrophy

Duchenne muscular dystrophy (DMD) is a severe, progressive neuromuscular disorder primarily affecting boys, caused by mutations in the DMD gene on the X chromosome. This gene encodes dystrophin, a crucial protein that helps stabilize and protect muscle fibers during contraction. Without functional dystrophin, muscle cells are easily damaged and eventually replaced by fat and fibrous tissue. Since it’s an X-linked recessive condition, females are typically carriers, while males with the mutation exhibit the disease. Symptoms usually emerge between ages 2 and 5, often beginning with difficulty running, climbing stairs, or standing up from the floor.

As the disease progresses, muscle weakness spreads from the pelvic region and thighs to the upper limbs and trunk. One of the hallmark signs is Gower’s sign, where children use their hands to “walk up” their thighs to stand due to weak hip and thigh muscles. By around age 12, most individuals require a wheelchair for mobility. The cardiac and respiratory muscles are eventually affected, leading to cardiomyopathy and breathing difficulties, which are the leading causes of mortality. Life expectancy has improved over recent decades but typically does not extend beyond early adulthood without advanced interventions.

Diagnosis involves a combination of clinical evaluation, genetic testing, and muscle biopsy. Elevated creatine kinase (CK) levels in the blood often signal muscle damage and may be one of the earliest diagnostic clues. Genetic testing confirms the presence of deletions, duplications, or point mutations in the DMD gene. In ambiguous cases, a muscle biopsy showing absent or severely reduced dystrophin confirms the diagnosis. Early and accurate diagnosis is crucial, especially as novel treatments—like exon skipping and gene therapy—are most effective in the earlier stages of disease progression.

Although there is no cure yet, management focuses on slowing disease progression, maintaining mobility, and supporting respiratory and cardiac health. Corticosteroids, such as prednisone and deflazacort, are standard treatments that help prolong ambulation and preserve muscle strength. Physical therapy, orthopedic interventions (e.g., scoliosis management), ventilatory support, and cardioprotective medications are all part of a multidisciplinary care approach. In recent years, gene-based therapies have shown promise in clinical trials, including exon-skipping drugs (like eteplirsen) and experimental gene editing methods such as CRISPR-Cas9, offering hope for future disease-modifying treatments..

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Duchenne muscular dystrophy

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