Rheb1 mediates DISC1-dependent regulation of new neuron development in the adult hippocampus

Eunchai Kang, Ju Young Kim, Cindy Y. Liu, Bo Xiao, Po Yu Chen, Kimberly M. Christian, Paul F. Worley, Hongjun Song, Guo Li Ming*

*Corresponding author for this work

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

A large number of susceptibility genes have been implicated in psychiatric disorders with a developmental origin, yet their biological roles and signaling mechanisms in neurodevelopment are largely unknown. Disrupted-In- Schizophrenia 1 (DISC1), a susceptibility gene for several major psychiatric disorders, regulates the development of newborn neurons in the adult hippocampus. Systemic pharmacological inhibition of mTOR signaling with rapamycin has been shown to rescue DISC1 deficiency-induced neurodevelopmental defects, as well as cognitive and affective deficits. Whether mTOR signaling plays a cell-autonomous and/or non-cell-autonomous role in DISC1-dependent regulation of neuronal development is not clear. Here we provide genetic evidence that hyper-activation of mTOR activator Rheb1 (Ras homolog enriched in brain 1) in newborn neurons recapitulates DISC1 deficiency-induced neurodevelopmental defects, including neuronal morphogenesis and migration. We further show that genetic deletion of Rheb1 rescues those defects in a cell-autonomous fashion in developing newborn neurons in the adult hippocampus. Our genetic and functional studies demonstrate that Rheb1 acts as a key mediator of DISC1-dependent regulation of mTOR signaling and neuronal development during adult hippocampal neurogenesis.

Original languageEnglish
Article numbere1081715
Number of pages10
JournalNeurogenesis
Volume2
Issue number1
DOIs
Publication statusPublished - 31 Jan 2015

Keywords

  • Adult neurogenesis
  • DISC1
  • Neurodevelopment
  • Rheb1

ASJC Scopus subject areas

  • Developmental Neuroscience
  • Developmental Biology

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    Kang, E., Kim, J. Y., Liu, C. Y., Xiao, B., Chen, P. Y., Christian, K. M., Worley, P. F., Song, H., & Ming, G. L. (2015). Rheb1 mediates DISC1-dependent regulation of new neuron development in the adult hippocampus. Neurogenesis, 2(1), [e1081715]. https://doi.org/10.1080/23262133.2015.1081715