NCBI Bookshelf. A service of the National Library of Medicine, National Institutes of Health.
National Center for Biotechnology Information (US). Genes and Disease [Internet]. Bethesda (MD): National Center for Biotechnology Information (US); 1998-.
![Image muscle.jpg](https://www.ncbi.nlm.nih.gov/books/NBK22228/bin/muscle.jpg)
The skeleton provides an anchor point against which muscles, attached via tendons, can exert force. There are a number of diseases that are caused by defects in genes important for the formation and function of muscles, and connective tissues. (Connective tissue is a broad term that includes bones, cartilage and tendons.)
Defects in fibrillin - a connective tissue proteins that is important in making the tissue strong yet flexible - cause Marfan syndrome, while diastrophic dysplasia is caused by a defect in a sulfate transporter found in cartilage.
Two diseases that originate through a defect in the muscle cells themselves are Duchenne muscular dystrophy (DMD) and myotonic dystrophy (DM). DM is another 'dynamic mutation' disease, similar to Huntington disease, that involves the expansion of a nucleotide repeat, this time in a muscle protein kinase gene. DMD involves a defect in the cytoskeletal protein, dystrophin, which is important for maintaining cell structure.
While the gene for Ellis-van Creveld syndrome has been mapped, we await the function of the protein to understand the molecular basis for this disease.
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