Neurofibromatosis type 1 (NF1) is a common neurodevelopmental disordercaused byimpaired function of the neurofibromin RAS regulator. Using a combination of Nf1 genetically engineered mice and pharmacological/genetic inhibition approaches, wereport that neurofibromindifferentially controls neural stem cell (NSC) proliferation and multilineage differentiation through the selective use of the PI3K/AKT and RAF/MEK pathways. While PI3K/ AKT governs neurofibromin-regulated NSC proliferation, multilineage differentiation is MEK-dependent. Moreover, whereas MEK-regulated multilineage differentiation requires Smad3-induced Jagged-1 expression and Notch activation, MEK/Smad3-regulated Hes1 induction is only responsible for astrocyte and neuronal differentiation.Collectively, these findings establish distinct roles for theRAS effector pathways in regulating brain NSC function.

Original languageEnglish
Pages (from-to)1677-1682
Number of pages6
JournalGenes and Development
Issue number16
StatePublished - Aug 15 2015


  • AKT
  • Astrocyte
  • Jagged1
  • MEK
  • Neurofibromin
  • Neuroglial progenitor
  • Notch


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