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- W3119353985 abstract "Abstract Biallelic pathogenic variants in SZT2 result in a neurodevelopmental disorder with shared features, including early-onset epilepsy, developmental delay, macrocephaly, and corpus callosum abnormalities. SZT2 is as a critical scaffolding protein in the amino acid sensing arm of the mTOR signaling pathway. Due to its large size (3432 amino acids), lack of crystal structure, and absence of functional domains, it is difficult to determine the pathogenicity of SZT2 missense and in-frame deletions. We report a cohort of twelve individuals with biallelic SZT2 variants and phenotypes consistent with SZT2 -related neurodevelopmental disorder. The majority of this cohort contained one or more SZT2 variants of uncertain significance (VUS). We developed a novel individualized platform to functionally characterize SZT2 VUSs. We identified a recurrent in-frame deletion (SZT2 p.Val1984del) which was determined to be a loss-of-function variant and therefore likely pathogenic. Haplotype analysis determined this single in-frame deletion is a founder variant in those of Ashkenazi Jewish ancestry. Overall, we present a FACS-based rapid assay to distinguish pathogenic variants from VUSs in SZT2 , using an approach that is widely applicable to other mTORopathies including the most common causes of the focal genetic epilepsies, DEPDC5, TSC1/2, MTOR and NPRL2 /3." @default.
- W3119353985 created "2021-01-18" @default.
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- W3119353985 date "2021-01-07" @default.
- W3119353985 modified "2023-09-27" @default.
- W3119353985 title "Determining the pathogenicity of variants of uncertain significance and identification of a founder variant in the epilepsy-associated gene, SZT2" @default.
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- W3119353985 doi "https://doi.org/10.1101/2021.01.06.425612" @default.
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