Drosophila Hey is a target of Notch in asymmetric divisions during embryonic and larval neurogenesis
Open Access
- 15 January 2010
- journal article
- Published by The Company of Biologists in Development
- Vol. 137 (2), 191-201
- https://doi.org/10.1242/dev.043604
Abstract
BHLH-O proteins are a subfamily of the basic-helix-loop-helix transcription factors characterized by an ‘Orange’ protein-protein interaction domain. Typical members are the Hairy/E(spl), or Hes, proteins, well studied in their ability, among others, to suppress neuronal differentiation in both invertebrates and vertebrates. Hes proteins are often effectors of Notch signalling. In vertebrates, another bHLH-O protein group, the Hey proteins, have also been shown to be Notch targets and to interact with Hes. We have studied the single Drosophila Hey orthologue. We show that it is primarily expressed in a subset of newly born neurons, which receive Notch signalling during their birth. Unlike in vertebrates, however, Hey is not expressed in precursor cells and does not block neuronal differentiation. It rather promotes one of two alternative fates that sibling neurons adopt at birth. Although in the majority of cases Hey is a Notch target, it is also expressed independently of Notch in some lineages, most notably the larval mushroom body. The availability of Hey as a Notch readout has allowed us to study Notch signalling during the genesis of secondary neurons in the larval central nervous system.Keywords
This publication has 59 references indexed in Scilit:
- A role for the transcription factor HEY1 in glioblastomaJournal of Cellular and Molecular Medicine, 2009
- Identification of Drosophila type II neuroblast lineages containing transit amplifying ganglion mother cellsDevelopmental Neurobiology, 2008
- The Tumor Suppressors Brat and Numb Regulate Transit-Amplifying Neuroblast Lineages in DrosophilaDevelopmental Cell, 2008
- Delta Notch and then? Protein interactions and proposed modes of repression by Hes and Hey bHLH factorsNucleic Acids Research, 2007
- Glial cell development and function in the Drosophila visual systemNeuron Glia Biology, 2007
- Notch signalling in vertebrate neural developmentNature Reviews Neuroscience, 2006
- A hidden program in Drosophila peripheral neurogenesis revealed: fundamental principles underlying sensory organ diversityDevelopmental Biology, 2004
- Numb Antagonizes Notch Signaling to Specify Sibling Neuron Cell FatesNeuron, 1996
- Suppressor of hairless directly activates transcription of enhancer of split complex genes in response to Notch receptor activity.Genes & Development, 1995
- The neurogenic suppressor of hairless DNA-binding protein mediates the transcriptional activation of the enhancer of split complex genes triggered by Notch signaling.Genes & Development, 1995