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- W156748014 abstract "In the central nervous system, tuberous sclerosis complex (TSC) is characterized by a range of lesions including cortical tubers, white matter heterotopias, subependymal nodules, and subependymal giant cell astrocytomas (SEGAs). Recent studies have implicated an important role for the TSC genes TSC1 and TSC2, in a signaling pathway involving the mammalian target of rapamycin (mTOR) kinase. We performed immunohistochemical and genetic analyses on SEGAs from 7 TSC patients, 4 with mutations in TSC1, and 3 with mutations in TSC2. SEGA cells show high levels of phospho-S6K, phospho-S6, and phospho-Stat3, all proteins downstream of and indicative of mTOR activation. Such expression is not seen in histologically normal control tissue. Five of 6 SEGAs also showed evidence of biallelic mutation of TSC1 or TSC2, suggesting that SEGAs develop due to complete loss of a functional tuberin-hamartin complex. We conclude that TSC SEGAs likely arise through a two-hit mechanism of biallelic inactivation of TSC1 or TSC2, leading to activation of the mTOR kinase." @default.
- W156748014 created "2016-06-24" @default.
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- W156748014 date "2004-12-01" @default.
- W156748014 modified "2023-10-18" @default.
- W156748014 title "Pathogenesis of Tuberous Sclerosis Subependymal Giant Cell Astrocytomas: Biallelic Inactivation of<i>TSC1</i>or<i>TSC2</i>Leads to mTOR Activation" @default.
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- W156748014 doi "https://doi.org/10.1093/jnen/63.12.1236" @default.
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