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Somatic mosaic deletions involving SCN1A cause Dravet syndrome

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(Nakayama et al. 2018) Although 10-20% of patients with Dravet syndrome test negative for SCN1A mutations on standard tests, researchers have been able to identify mutations with improved testing methods. This study examined 230 cases of Dravet syndrome with apparently negative SCN1A results and found 2 mosaic microdeletions of the entire SCN1A gene. Mosaic mutations occur sometime after […]

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