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ZFIN ID: ZDB-PUB-120727-23
Intronic miR-26b controls neuronal differentiation by repressing its host transcript, ctdsp2
Dill, H., Linder, B., Fehr, A., and Fischer, U.
Date: 2012
Source: Genes & Development   26(1): 25-30 (Journal)
Registered Authors:
Keywords: miR-26b, ctdsp2; REST, neurogenesis, neuronal differentiation, zebrafish
MeSH Terms:
  • Animals
  • Cell Differentiation*
  • Cell Line, Tumor
  • Down-Regulation
  • Embryo, Nonmammalian
  • Gene Expression Profiling
  • Gene Expression Regulation, Developmental*
  • Introns/genetics
  • Mice
  • MicroRNAs/genetics*
  • MicroRNAs/metabolism*
  • Neurogenesis/genetics
  • Neurons/cytology*
  • Neurons/metabolism*
  • Phosphoprotein Phosphatases/genetics*
  • Zebrafish/embryology
  • Zebrafish Proteins/genetics*
PubMed: 22215807 Full text @ Genes & Dev.

Differentiation of neural stem cells (NSCs) to neurons requires the activation of genes controlled by the repressor element 1 (RE1) silencing transcription factor (REST)/neuron-restrictive silencer factor (NRSF) protein complex. Important components of REST/NRSF are phosphatases (termed RNA polymerase II C-terminal domain small phosphatases [CTDSPs]) that inhibit RNA polymerase II and suppress neuronal gene expression in NSCs. Activation of genes controlled by CTDSPs is required for neurogenesis, but how this is achieved is not fully understood. Here we show that ctdsp2 is a target of miR-26b, a microRNA that is encoded in an intron of the ctdsp2 primary transcript. This intrinsic negative feedback loop is inactive in NSCs because miR-26b biogenesis is inhibited at the precursor level. Generation of mature miR-26b is activated during neurogenesis, where it suppresses Ctdsp2 protein expression and is required for neuronal cell differentiation in vivo.