SpHnf6, a transcription factor that executes multiple functions in sea urchin embryogenesis

Ochan Otim, Gabriele Amore, Takuya Minokawa, David R. McClay, Eric H. Davidson

Research output: Contribution to journalArticle

54 Citations (Scopus)

Abstract

The Strongylocentrotus purpuratus hnf6 (Sphnf6) gene encodes a new member of the ONECUT family of transcription factors. The expression of hnf6 in the developing embryo is triphasic, and loss-of-function analysis shows that the Hnf6 protein is a transcription factor that has multiple distinct roles in sea urchin development. hnf6 is expressed maternally, and before gastrulation its transcripts are distributed globally. Early in development, its expression is required for the activation of PMC differentiation genes such as sm50, pm27, and msp130, but not for the activation of any known PMC regulatory genes, for example, alx, ets1, pmar1, or tbrain. Micromere transplantation experiments show that the gene is not involved in early micromere signaling. Early hnf6 expression is also required for expression of the mesodermal regulator gatac. The second known role of hnf6 is its participation after gastrulation in the oral ectoderm gene regulatory network (GRN), in which its expression is essential for the maintenance of the state of oral ectoderm specification. The third role is in the neurogenic ciliated band, which is foreshadowed exactly by a trapezoidal band of hnf6 expression at the border of the oral ectoderm and where it continues to be expressed through the end of embryogenesis. Neither oral ectoderm regulatory functions nor ciliated band formation occur normally in the absence of hnf6 expression.

Original languageEnglish
Pages (from-to)226-243
Number of pages18
JournalDevelopmental Biology
Volume273
Issue number2
DOIs
Publication statusPublished - 2004 Sep 15
Externally publishedYes

Keywords

  • Morpholino antisense oligonucleotide
  • ONECUT
  • Oral ectoderm
  • PMC
  • Sea urchin embryo
  • Transcription factor
  • hnf6

ASJC Scopus subject areas

  • Molecular Biology
  • Developmental Biology
  • Cell Biology

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