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Neuron. 2019 Mar 20;101(6):1070-1088. doi: 10.1016/j.neuron.2019.02.041.

A Synaptic Perspective of Fragile X Syndrome and Autism Spectrum Disorders.

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Department of Fundamental Neurosciences, University of Lausanne, Lausanne, Switzerland; Department of Biomedicine and Prevention, University of Rome Tor Vergata, Rome, Italy. Electronic address:
Dominick P. Purpura Department of Neuroscience, Albert Einstein College of Medicine, New York City, NY, USA. Electronic address:


Altered synaptic structure and function is a major hallmark of fragile X syndrome (FXS), autism spectrum disorders (ASDs), and other intellectual disabilities (IDs), which are therefore classified as synaptopathies. FXS and ASDs, while clinically and genetically distinct, share significant comorbidity, suggesting that there may be a common molecular and/or cellular basis, presumably at the synapse. In this article, we review brain architecture and synaptic pathways that are dysregulated in FXS and ASDs, including spine architecture, signaling in synaptic plasticity, local protein synthesis, (m)RNA modifications, and degradation. mRNA repression is a powerful mechanism for the regulation of synaptic structure and efficacy. We infer that there is no single pathway that explains most of the etiology and discuss new findings and the implications for future work directed at improving our understanding of the pathogenesis of FXS and related ASDs and the design of therapeutic strategies to ameliorate these disorders.


ASDs; ERK; FMRP; FXS; MNK; TSC; mGluRs; mRNA metabolism; mTOR; synaptopathies

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