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Cell type-specific translation profiling reveals a novel strategy for treating fragile X syndrome

ABSTRACT: Excessive mRNA translation downstream of group I metabotropic glutamate receptors (mGlu1/5) is a core pathophysiology of fragile X syndrome (FX), however the differentially translating mRNAs that contribute to altered neural function are not known. We used Translating Ribosome Affinity Purification (TRAP) and RNA-seq to identify mistranslating mRNAs in CA1 pyramidal neurons of the FX mouse model (Fmr1-/y) hippocampus, which exhibit exaggerated mGlu1/5-induced long-term synaptic depression (LTD). In these neurons, we find the Chrm4 transcript encoding muscarinic acetylcholine receptor 4 (M4) is excessively translated, and synthesis of M4 downstream of mGlu5 activation is mimicked and occluded. Surprisingly, enhancement rather than inhibition of M4 activity normalizes core phenotypes in the Fmr1-/y, including excessive protein synthesis, exaggerated mGluR-LTD, and audiogenic seizures. These results suggest that not all excessively translated mRNAs in the Fmr1-/y brain are detrimental, and some may be candidates for enhancement to correct pathological changes in the FX brain.

ORGANISM(S): Mus musculus

PROVIDER: GSE101823 | GEO | 2017/08/02

SECONDARY ACCESSION(S): PRJNA395590

REPOSITORIES: GEO

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