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• W3175448220 abstract "Abstract FZR1 , which encodes the Cdh1 subunit of the Anaphase Promoting Complex, plays an important role in neurodevelopment by regulating cell cycle and by its multiple post-mitotic functions in neurons. In this study, evaluation of 250 unrelated patients with developmental epileptic encephalopathies (DEE) and a connection on GeneMatcher led to the identification of three de novo missense variants in FZR1 . Two variants led to the same amino acid change. All individuals had a DEE with childhood onset generalized epilepsy, intellectual disability, mild ataxia and normal head circumference. Two individuals were diagnosed with the DEE subtype Myoclonic Atonic Epilepsy (MAE). We provide gene burden testing using two independent statistical tests to support FZR1 association with DEE. Further, we provide functional evidence that the missense variants are loss-of - function (LOF) alleles using Drosophila neurodevelopment assays. Using three fly mutant alleles of the Drosophila homolog fzr and overexpression studies, we show that patient variants do not support proper neurodevelopment. With the recent report of a patient with neonatal-onset DEE with microcephaly who also carries a de novo FZR1 missense variant, our study consolidates the relationship between FZR1 and DEE, and expands the associated phenotype. We conclude that heterozygous LOF of FZR1 leads to DEE associated with a spectrum of neonatal to childhood onset seizure types, developmental delay and mild ataxia. Microcephaly can be present but is not an essential feature of FZR1 -encephalopathy. In summary, our approach of targeted sequencing using novel gene candidates and functional testing in Drosophila will help solve undiagnosed MAE/DEE cases." @default.
• W3175448220 created "2021-07-05" @default.
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• W3175448220 date "2021-06-20" @default.
• W3175448220 modified "2023-10-01" @default.
• W3175448220 title "De novo FZR1 loss-of-function variants cause developmental and epileptic encephalopathies including Myoclonic Atonic Epilepsy" @default.
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• W3175448220 doi "https://doi.org/10.1101/2021.06.12.21256778" @default.
• W3175448220 hasPublicationYear "2021" @default.
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