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Regulation of POU genes by castor and hunchback establishes layered compartments in the Drosophila CNS

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Kambadur, Ravi, Koizumi, Keita, Stivers, Chad, Nagle, James, Poole, Stephen J., Odenwald, Ward F.·1998·Genes & Development

DOI 10.1101/gad.12.2.246

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Abstract

POU transcription factors participate in cell-identity decisions during nervous system development, yet little is known about the regulatory networks controlling their expression. We report all known Drosophila POU genes require castor (cas) for correct CNS expression. drifter and I-POU depend on cas for full expression, whereas pdm-1 and pdm-2 are negatively regulated. cas encodes a zinc finger protein that shares DNA-binding specificity with another pdm repressor: the gap segmentation gene regulator Hunchback (Hb). Our studies reveal that the embryonic CNS contains sequentially generated neuroblast sublineages that can be distinguished by their expression of either Hb, Pdm-1, or Cas. Hb and Cas may directly silence pdm expression in early and late developing sublineages, given that pdm-1 cis-regulatory DNA contains ⩾32 Hb/Cas-binding sites and its enhancer(s) are ectopically activated in cas− neuroblasts. In addition, the targeted misexpression of Cas in all neuroblast lineages reduces Pdm-1 expression without altering Hb expression. By ensuring correct POU gene expression boundaries, hb and cas maintain temporal subdivisions in the cell-identity circuitry controlling CNS development.

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Authors: Kambadur, R., Koizumi, K., Stivers, C., Nagle, J., Poole, S. J., & Odenwald, W. F.
Venue: Genes & Development
Publisher: Cold Spring Harbor Laboratory
Published: 1998-01-15
Volume: 12
Issue: 2
Pages: 246-260
ISSN: 0890-9369 (ISSN-L)
1549-5477
DOI: 10.1101/gad.12.2.246
OpenAlex: W1991777044
Cited by: 269
References: 67
Type: posted content
Language: en
Open access: diamond

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Regulation of POU genes by castor and hunchback establishes layered compartments in the Drosophila CNS

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