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Development Genes and Evolution

, Volume 214, Issue 4, pp 170–175 | Cite as

The Trox-2 Hox/ParaHox gene of Trichoplax (Placozoa) marks an epithelial boundary

  • Wolfgang Jakob
  • Sven Sagasser
  • Stephen Dellaporta
  • Peter Holland
  • Kerstin Kuhn
  • Bernd Schierwater
Original Article

Abstract

Hox and ParaHox genes are implicated in axial patterning of cnidarians and bilaterians, and are thought to have originated by tandem duplication of a single “ProtoHox” gene followed by duplication of the resultant gene cluster. It is unclear what the ancestral role of Hox/ParaHox genes was before the divergence of Cnidaria and Bilateria, or what roles the postulated ProtoHox gene(s) played. Here we describe the full coding region, spatial expression and function of Trox-2, the single Hox/ParaHox-type gene identified in Trichoplax adhaerens (phylum Placozoa) and either a candidate ProtoHox or a ParaHox gene. Trox-2 is expressed in a ring around the periphery of Trichoplax, in small cells located between the outer margins of the upper and lower epithelial cell layers. Inhibition of Trox-2 function, either by uptake of morpholino antisense oligonucleotides or by RNA interference, causes complete cessation of growth and binary fission. We speculate that Trox-2 functions within a hitherto unrecognized population of possibly multipotential peripheral stem cells that contribute to differentiated cells at the epithelial boundary of Trichoplax.

Keywords

Trichoplax Placozoa RNAi Morpholino ProtoHox 

Notes

Acknowledgements

This work was supported by the German Science Foundation, (DFG Schi 277/10-2), the Human Frontier Science Program (HFSP RGP0221/2001-M), and the Graduiertenförderung Niedersachsen (fellowship to W.J.). We are grateful to Jutta Bunnenberg for technical assistance, and two anonymous reviewers for valuable and constructive comments.

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Copyright information

© Springer-Verlag 2004

Authors and Affiliations

  • Wolfgang Jakob
    • 1
  • Sven Sagasser
    • 1
  • Stephen Dellaporta
    • 2
  • Peter Holland
    • 3
  • Kerstin Kuhn
    • 4
  • Bernd Schierwater
    • 1
    • 2
  1. 1.ITZ, Ecology and EvolutionTiHo HannoverHannoverGermany
  2. 2.MCDBYale UniversityNew HavenUSA
  3. 3.Department of ZoologyUniversity of OxfordOxfordUK
  4. 4.Ecology and EvolutionJ.W. Goethe-UniversitätFrankfurtGermany

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