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Becker muscular dystrophy is related to Duchenne muscular dystrophy in that both result from a mutation in the dystrophin gene, however the hallmark of Becker is milder in-frame deletions. [4] and hence has a milder course, with patients maintaining ambulation till 50–60 years if detected early. [7] [8]
In 1986, MDA-funded researcher Louis M. Kunkel identified the dystrophin gene, the gene for Duchenne muscular dystrophy (DMD) and Becker muscular dystrophy (BMD). [51] MDA funded the first gene therapy trial in 1999, followed by the first vector based gene therapy trial for DMD in 2006. [52]
The majority of muscular dystrophies are inherited; the different muscular dystrophies follow various inheritance patterns (X-linked, autosomal recessive or autosomal dominant). In a small percentage of patients, the disorder may have been caused by a de novo (spontaneous) mutation. [9] [10]
Eteplirsen (brand name Exondys 51) is a medication to treat, but not cure, some types of Duchenne muscular dystrophy (DMD), caused by a specific mutation. Eteplirsen only targets specific mutations and can be used to treat about 14% of DMD cases. [1] [2] Eteplirsen is a form of antisense therapy.
Gowers's sign is classically seen in Duchenne muscular dystrophy where it is mostly evident at 4–6 years, but also presents itself in centronuclear myopathy, myotonic dystrophy and various other conditions associated with proximal muscle weakness, including Becker muscular dystrophy, dermatomyositis and Pompe disease.
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Duchenne muscular dystrophy is the most common type of muscular dystrophy, [3] with a median life expectancy of 27–31 years. [5] [11] However, with comprehensive care, some individuals may live into their 30s or 40s. [3] Duchenne muscular dystrophy is considerably rarer in females, occurring in approximately one in 50,000,000 live female ...