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Updated: Dec 28, 2025
11:48
Chromatin Immunoprecipitation in the Cnidarian Model System Exaiptasia diaphana
Published on: March 17, 2023
784
Transcription factor AP2 controls cnidarian germ cell induction
Timothy Q DuBuc1, Christine E Schnitzler2,3, Eleni Chrysostomou1
1Centre for Chromosome Biology, School of Natural Sciences, National University of Ireland Galway, Galway, Ireland.
Science (New York, N.Y.)
|February 15, 2020
Summary
Transcription factor AP2 (Tfap2) commits adult stem cells to germ cells in clonal animals. This finding reveals a conserved mechanism for germ cell development across diverse animal groups.
Area of Science:
- Developmental biology
- Stem cell biology
- Evolutionary biology
Background:
- Clonal animals lack a sequestered germ line, relying on adult stem cells for gamete production.
- The mechanisms of germ cell fate induction in clonal animals remain largely unknown.
- Understanding germ cell development in non-sequestering animals can illuminate conserved evolutionary pathways.
Purpose of the Study:
- To investigate the role of transcription factor AP2 (Tfap2) in germ cell commitment in the clonal cnidarian *Hydractinia symbiolongicarpus*.
- To determine if Tfap2 is essential for germ cell and gonad development in this species.
- To compare germ cell induction mechanisms between clonal and bilaterian animals.
Main Methods:
- Utilized *Tfap2* gene knockout mutants in *Hydractinia symbiolongicarpus*.
- Performed cell transplantation experiments using wild-type and mutant cells.
- Investigated the effect of forced *Tfap2* expression in adult stem cells (i-cells).
Main Results:
- *Tfap2* mutants exhibited a complete absence of germ cells and gonads.
- Transplanted wild-type cells could restore gonad development but not germ cell induction in mutants.
- Forced expression of *Tfap2* in i-cells successfully induced germ cell fate.
Conclusions:
- Transcription factor AP2 (Tfap2) is a critical regulator of germ cell commitment in *Hydractinia symbiolongicarpus*.
- Tfap2 acts specifically on adult stem cells to induce germ cell fate, independent of gonad formation.
- The role of Tfap2 in germ cell commitment is conserved across animals with and without sequestered germ lines.
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