Zath3 , a neural basic helix-loop-helix gene, regulates early neurogenesis in the zebrafish

Zath3 , a neural basic helix-loop-helix gene, regulates early neurogenesis in the zebrafish We have isolated a basic helix-loop-helix (bHLH) gene homologous to the Drosophila proneural gene atonal , termed zath3 , from zebrafish. zath3 is expressed in neurons of the central nervous system and in subsets of cranial ganglia. Zebrafish mindbomb ( mib ) mutants have a higher density of zath3 expressing cells and narrowminded ( nrd ) mutants lack zath3 expression in a domain corresponding to primary sensory neurons showing that the expression of zath3 is regulated by both mib and nrd . Injection of synthetic zath3 RNA into zebrafish embryos expands the neural plate size, promotes ectopic expression of neuronal markers, and partially rescues the deficit of sensory neurons seen in nrd mutants. Interfering with zath3 function using antisense morpholino oligonucleotides (MO) has no significant effect on early neurogenesis. However, a double knock down of zath3 and neurogenin1 ( ngn1 ), another atonal homologue, with morpholinos (MOs) leads to more severe defects in neurogenesis than are seen with ngn1 MO alone: a subtle reduction of motor and inter-neurons, and an almost complete loss all cranial ganglia. This study suggests that zath3 and ngn1 have partially overlapping roles in early neurogenesis. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Biochemical and Biophysical Research Communications Elsevier

Zath3 , a neural basic helix-loop-helix gene, regulates early neurogenesis in the zebrafish

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Publisher
Elsevier
Copyright
Copyright © 2003 Elsevier Ltd
ISSN
0006-291x
D.O.I.
10.1016/S0006-291X(03)01353-6
Publisher site
See Article on Publisher Site

Abstract

We have isolated a basic helix-loop-helix (bHLH) gene homologous to the Drosophila proneural gene atonal , termed zath3 , from zebrafish. zath3 is expressed in neurons of the central nervous system and in subsets of cranial ganglia. Zebrafish mindbomb ( mib ) mutants have a higher density of zath3 expressing cells and narrowminded ( nrd ) mutants lack zath3 expression in a domain corresponding to primary sensory neurons showing that the expression of zath3 is regulated by both mib and nrd . Injection of synthetic zath3 RNA into zebrafish embryos expands the neural plate size, promotes ectopic expression of neuronal markers, and partially rescues the deficit of sensory neurons seen in nrd mutants. Interfering with zath3 function using antisense morpholino oligonucleotides (MO) has no significant effect on early neurogenesis. However, a double knock down of zath3 and neurogenin1 ( ngn1 ), another atonal homologue, with morpholinos (MOs) leads to more severe defects in neurogenesis than are seen with ngn1 MO alone: a subtle reduction of motor and inter-neurons, and an almost complete loss all cranial ganglia. This study suggests that zath3 and ngn1 have partially overlapping roles in early neurogenesis.

Journal

Biochemical and Biophysical Research CommunicationsElsevier

Published: Aug 15, 2003

References

  • Ectodermal patterning in vertebrate embryos
    Sasai, Y; De Robertis, E.M
  • Basic helix-loop-helix genes in neural development
    Lee, J.E
  • Stages of embryonic development of the zebrafish
    Kimmel, C.B; Ballard, W.W; Kimmel, S.R; Ullmann, B; Schilling, T.F
  • Conversion of ectoderm into a neural fate by ATH-3, a vertebrate basic helix-loop-helix gene homologous to Drosophila proneural gene atonal
    Takebayashi, K; Takahashi, S; Yokota, C; Tsuda, H; Nakanishi, S; Asashima, M; Kageyama, R
  • Mammalian achaete-scute and atonal homologs regulate neuronal versus glial fate determination in the central nervous system
    Tomita, K; Moriyoshi, K; Nakanishi, S; Guillemot, F; Kageyama, R
  • Neurogenin1 defines zebrafish cranial sensory ganglia precursors
    Andermann, P; Ungos, J; Raible, D.W

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