Fragile X syndrome (FXS), the most common inherited cause of intellectual disability and autism, is caused by silencing of the Fmr1 gene, leading to a lack of the FMRP protein, which regulates protein synthesis in neurons. One key pathway affected by FMRP loss is the metabotropic glutamate receptor 5 (mGluR5) signaling pathway, where activation of mGluR5 leads to excessive translation of several proteins involved in synaptic plasticity.