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• W2205198819 endingPage "15306" @default.
• W2205198819 startingPage "15295" @default.
• W2205198819 abstract "Fragile X syndrome (FXS), the most common form of inherited mental retardation, is a neurodevelopmental disorder caused by silencing of the FMR1 gene, which in FXS becomes inactivated during human embryonic development. We have shown recently that this process is recapitulated by in vitro neural differentiation of FX human embryonic stem cells (FX-hESCs), derived from FXS blastocysts. In the present study, we analyzed morphological and functional properties of neurons generated from FX-hESCs. Human FX neurons can fire single action potentials (APs) to depolarizing current commands, but are unable to discharge trains of APs. Their APs are of a reduced amplitudes and longer durations than controls. These are reflected in reduced inward Na(+) and outward K(+) currents. In addition, human FX neurons contain fewer synaptic vesicles and lack spontaneous synaptic activity. Notably, synaptic activity in these neurons can be restored by coculturing them with normal rat hippocampal neurons, demonstrating a critical role for synaptic mechanisms in FXS pathology. This is the first extensive functional analysis of human FX neurons derived in vitro from hESCs that provides a convenient tool for studying molecular mechanisms underlying the impaired neuronal functions in FXS.Fragile X syndrome (FXS), the most common form of inherited mental retardation, is caused by silencing of the FMR1 gene. In this study, we describe for the first time the properties of neurons developed from human embryonic stem cells (hESCs) that carry the FMR1 mutation and are grown in culture for extended periods. These neurons are retarded compared with controls in several morphological and functional properties. In vitro neural differentiation of FX hESCs can thus serve as a most relevant system for the analysis of molecular mechanisms underlying the impaired neuronal functions in FXS." @default.
• W2205198819 created "2016-06-24" @default.
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• W2205198819 date "2015-11-18" @default.
• W2205198819 modified "2023-10-14" @default.
• W2205198819 title "Functional Deficiencies in Fragile X Neurons Derived from Human Embryonic Stem Cells" @default.
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• W2205198819 doi "https://doi.org/10.1523/jneurosci.0317-15.2015" @default.
• W2205198819 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6605488" @default.
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