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• W1976783669 abstract "Excitable cells express a variety of ion channels that allow rapid exchange of ions with the extracellular space. Opening of Na(+) channels in excitable cells results in influx of Na(+) and cellular depolarization. The function of Na(v)1.5, an Na(+) channel expressed in the heart, brain, and gastrointestinal tract, is altered by interacting proteins. The pore-forming alpha-subunit of this channel is encoded by SCN5A. Genetic perturbations in SCN5A cause type 3 long QT syndrome and type 1 Brugada syndrome, two distinct heritable arrhythmia syndromes. Mutations in SCN5A are also associated with increased prevalence of gastrointestinal symptoms, suggesting that the Na(+) channel plays a role in normal gastrointestinal physiology and that alterations in its function may cause disease. We collected blood from patients with intestinal pseudo-obstruction (a disease associated with abnormal motility in the gut) and screened for mutations in SCN5A and ion channel-interacting proteins. A 42-year-old male patient was found to have a mutation in the gene TCAP, encoding for the small protein telethonin. Telethonin was found to be expressed in the human gastrointestinal smooth muscle, co-localized with Na(v)1.5, and co-immunoprecipitated with sodium channels. Expression of mutated telethonin, when co-expressed with SCN5A in HEK 293 cells, altered steady state activation kinetics of SCN5A, resulting in a doubling of the window current. These results suggest a new role for telethonin, namely that telethonin is a sodium channel-interacting protein. Also, mutations in telethonin can alter Na(v)1.5 kinetics and may play a role in intestinal pseudo-obstruction." @default.
• W1976783669 created "2016-06-24" @default.
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• W1976783669 date "2008-06-01" @default.
• W1976783669 modified "2023-10-07" @default.
• W1976783669 title "A Mutation in Telethonin Alters Nav1.5 Function" @default.
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• W1976783669 doi "https://doi.org/10.1074/jbc.m801744200" @default.
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