The basic helix-loop-helix olig3 establishes the neural plate boundary of the trunk and is necessary for development of the dorsal spinal cord

Filippi, A., Tiso, N., Deflorian, G., Zecchin, E., Bortolussi, M., and Argenton, F.
Proceedings of the National Academy of Sciences of the United States of America   102(12): 4377-4382 (Journal)
Registered Authors
Argenton, Francesco, Bortolussi, Marino, Deflorian, Gianluca, Filippi, Alida, Tiso, Natascia, Zecchin, Elisabetta
interneurons; neural crest; olig3; zebrafish; glia
MeSH Terms
  • Animals
  • Base Sequence
  • DNA, Complementary/genetics
  • Gastrula/cytology
  • Gene Expression Regulation, Developmental
  • Helix-Loop-Helix Motifs/genetics
  • Helix-Loop-Helix Motifs/physiology
  • In Situ Hybridization
  • Molecular Sequence Data
  • Nerve Tissue Proteins/genetics*
  • Nerve Tissue Proteins/physiology*
  • Neural Crest/embryology*
  • Oligodeoxyribonucleotides, Antisense/genetics
  • Oligodeoxyribonucleotides, Antisense/pharmacology
  • RNA, Messenger/genetics
  • RNA, Messenger/metabolism
  • Spinal Cord/embryology*
  • Transcription Factors/genetics*
  • Transcription Factors/physiology*
  • Zebrafish/embryology*
  • Zebrafish/genetics*
  • Zebrafish Proteins/genetics*
  • Zebrafish Proteins/physiology*
15731351 Full text @ Proc. Natl. Acad. Sci. USA
olig genes encode a previously unrecognized group of vertebrate-specific basic helix-loop-helix transcription factors. As shown in mice, chickens, and zebrafish, two members of this group, olig1 and olig2, are involved in the differentiation of motoneurons and oligodendrocytes, but nothing is known about the role of the third member, olig3. Here, we show that olig3 plays an essential role in the establishment of the neural crest-lateral neural plate boundary. In zebrafish embryos, morpholino-induced olig3 inactivation dramatically increases the number of neural crest cells, but lateral neural plate fates (interneurons and astrocytes) are missing. Zebrafish swirl mutants that have impaired bone morphogenetic protein signaling and lack neural crest cells display an expanded olig3 expression domain. Moreover, olig3 is up-regulated in mindbomb mutants lacking the neural crest because of an impaired notch signaling, and olig3 repression in such mutants rescues the neural crest. In addition, olig3 regulates ngn1 and deltaA expression in interneuron precursors. Our results indicate that olig3 has an essential proneural activity in the dorsal spinal cord and cooperates with the Delta/Notch regulatory loop to establish the boundary between the neural crest and the lateral neural plate. Thus, a proper regulation of the olig gene family is essential for the formation of three cell types (oligodendrocytes, astrocytes, and neural crest) that are unique to vertebrates.
Genes / Markers
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Mutations / Transgenics
Human Disease / Model
Sequence Targeting Reagents
Engineered Foreign Genes