Loss of Tsc1 in cerebellar Purkinje cells induces transcriptional and translation changes in FMRP target transcripts

Elife. 2021 Jul 14:10:e67399. doi: 10.7554/eLife.67399.


Tuberous sclerosis complex (TSC) is a genetic disorder that is associated with multiple neurological manifestations. Previously, we demonstrated that Tsc1 loss in cerebellar Purkinje cells (PCs) can cause altered social behavior in mice. Here, we performed detailed transcriptional and translational analyses of Tsc1-deficient PCs to understand the molecular alterations in these cells. We found that target transcripts of the Fragile X Mental Retardation Protein (FMRP) are reduced in mutant PCs with evidence of increased degradation. Surprisingly, we observed unchanged ribosomal binding for many of these genes using translating ribosome affinity purification. Finally, we found that multiple FMRP targets, including SHANK2, were reduced, suggesting that compensatory increases in ribosomal binding efficiency may be unable to overcome reduced transcript levels. These data further implicate dysfunction of FMRP and its targets in TSC and suggest that treatments aimed at restoring the function of these pathways may be beneficial.

Keywords: FMRP; Tuberous Sclerosis; autism; mTOR; mouse; neuroscience; ribosome; translation.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, Non-P.H.S.

MeSH terms

  • Animals
  • Disease Models, Animal
  • Fragile X Mental Retardation Protein / genetics*
  • Fragile X Mental Retardation Protein / metabolism*
  • Gene Expression
  • Mice
  • Nerve Tissue Proteins / metabolism
  • Purkinje Cells / metabolism*
  • Ribosomes / metabolism
  • Tuberous Sclerosis / genetics
  • Tuberous Sclerosis / metabolism
  • Tuberous Sclerosis Complex 1 Protein / genetics*
  • Tuberous Sclerosis Complex 1 Protein / metabolism*


  • Fmr1 protein, mouse
  • Nerve Tissue Proteins
  • Shank2 protein, mouse
  • Tsc1 protein, mouse
  • Tuberous Sclerosis Complex 1 Protein
  • Fragile X Mental Retardation Protein

Associated data

  • GEO/GSE169719