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Ancestor membership does not transfer phenotype values between groups.","importantHtml":""},"sections":[{"bodyHtml":"<p>Stormorken syndrome is caused by a mutation in the STIM1 gene. The protein produced from this gene is involved in controlling the entry of positively charged calcium atoms (calcium ions) into cells. The STIM1 protein recognizes when calcium ion levels are low and stimulates the flow of ions into the cell through special channels in the cell membrane called calcium-release activated calcium (CRAC) channels. The flow of calcium ions through CRAC channels triggers signaling within cells that helps control gene activity, cell growth and division, and immune function.</p><p>The STIM1 gene mutation involved in Stormorken syndrome leads to production of a STIM1 protein that is constantly turned on (constitutively active), which means it continually stimulates calcium ion entry through CRAC channels regardless of ion levels. Researchers suggest that the abnormal ion flow in platelets causes them to break down earlier than usual, leading to thrombocytopenia and bleeding problems in people with Stormorken syndrome. It is unknown how constitutively active STIM1 leads to the other features of the disorder.</p><p class=\"section-source\"><a href=\"https://medlineplus.gov/genetics/condition/stormorken-syndrome/#causes\">MedlinePlus Genetics: Causes</a></p>","key":"forms","title":"What causes Stormorken syndrome?"},{"bodyHtml":"<p class=\"section-source\">Source: <a href=\"https://medlineplus.gov/genetics/condition/stormorken-syndrome\">MedlinePlus Genetics</a></p>","key":"overview","title":"Condition overview"}],"sharedSources":[],"slug":"stormorken-syndrome","sourceDocuments":[{"name":"Stormorken syndrome","reviewed":"2014-08","sections":{"causes":{"fetchedAt":"2026-10-20T20:25:18.320274+00:00","label":"Causes","pageSha256":"c425fbb33fccd68a75e86e18c5c6dd9224596866f37d0c6a6b3400cf9771f830","sourceUrl":"https://medlineplus.gov/genetics/condition/stormorken-syndrome/#causes","status":"available"}},"source_release":"2026-10-01","url":"https://medlineplus.gov/genetics/condition/stormorken-syndrome"}],"sourceNote":"MedlinePlus descriptions and Causes; original HPO annotations.","takeawayHtml":"Cause explanations are from MedlinePlus Genetics. Feature values below retain their original sources and patient groups.","title":"Stormorken syndrome"},"schemaVersion":1}