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Until the 1980s, little was known about the cause of any of the forms of muscular dystrophy. In 1986,  [[https://hideuri.com/rE8Oj2|Prime Boosts Supplement]] MDA-supported researchers identified a gene on the X chromosome that,  [[https://www.yewiki.org/What_Are_The_Top_Supplements_For_Olympic_Weightlifters_and_Can_They_Help_Me|Prime Boosts Supplement]] when flawed (mutated), causes Duchenne, Becker, and intermediate forms of muscular dystrophy. Genes contain codes, or recipes, for proteins, which are important biological components in all forms of life. In 1987, the protein associated with the DMD gene was identified and named dystrophin. The DMD gene is the largest gene in humans and is located in the short arm of the X chromosome, in the Xp21.2 locus (a locus is the position of a gene on a chromosome). The majority of mutations of the DMD gene are deletions of one or more parts of it. DMD occurs because the mutated DMD gene fails to produce adequate amounts of functional dystrophin. Individuals with BMD genetic mutations make partially functional dystrophin, which somewhat protects their muscles from degenerating as severely or as quickly as in DMD.


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During a muscle cell contraction, the dystrophin protein transfers the force of muscle contraction from the inside of the muscle cell outward to the cell membrane. Because it connects the center of the muscle cell to the edge of the cell, the dystrophin protein is extremely long. One end is specialized for linking to the muscle cell interior and the other end is specialized for linking to a variety of proteins at the cell membrane. The long middle section, called the rod domain, is taken up by a series of repeating units called spectrin-like repeats. Many cases of DMD are caused by mutations in the part of the gene that encodes this middle section. Production of the entire protein stops when the mutation is encountered. The absence of dystrophin sets in motion a cascade of harmful effects. Without dystrophin, muscles are more susceptible to injury during contraction, which triggers inflammation.



Over time, chronic inflammation causes fibrous and fatty tissue to replace healthy muscle, severely compromising muscle function. Beyond its role in force-transfer, dystrophin also acts as a scaffold that anchors numerous molecules in place near the cell membrane. Loss of dystrophin disrupts the positioning of these molecules, which consequently disrupts their functions. An example of a functional disruption that occurs in DMD is the decrease of blood flow to muscles. Ultimately, lack of dystrophin causes muscle damage and progressive weakness, beginning in early childhood. DMD is inherited in an X-linked pattern because the gene that can carry a DMD-causing mutation is on the X chromosome. Every male has an X chromosome from his mother and a Y chromosome from his father. Females get two X chromosomes, one from each parent. Each son born to a female with a DMD gene mutation on one of her two X chromosomes has a 50% chance of inheriting the flawed gene and having DMD.



Each of her daughters has a 50% chance of inheriting the mutation and being a carrier. Carriers may have minimal to no symptoms, but can have a child with the mutation or the disease with subtler symptoms of weakness, cramps, and heart problems (cardiomyopathy). Although DMD often runs in a family, it is possible for a family with no history of DMD to suddenly have a son with the disease. There are two possible explanations. The first is that the genetic mutation leading to DMD may have existed in the females of a family for some generations without anyone knowing. Perhaps no male children were born with the disease, or, even if a boy in an earlier generation was affected, relatives may not have known what disease he had. The second possibility is that a child with DMD has a new genetic mutation that spontaneously arose in one of his mother’s egg cells. Because this mutation is not in the mother’s blood cells, it is impossible to detect by standard carrier testing.