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Trb3 regulates LR axis formation in zebrafish embryos.

Mrudhula Anuppalle1, Sateesh Maddirevula, Tae-Lin Huh

  • 1Department of Biological Sciences, College of Bioscience and Biotechnology, Chungnam National University, Daejeon, 305-764, Korea.

Molecules and Cells
|December 3, 2013
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Summary

Tribbles homolog 3 (trb3) is crucial for zebrafish development, influencing organ positioning and left-right axis patterning. This pseudokinase regulates TGF-signaling pathways during embryogenesis.

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Area of Science:

  • Developmental biology
  • Molecular biology
  • Genetics

Background:

  • Tribbles homolog 3 (trb3) is an evolutionarily conserved pseudokinase.
  • Pseudokinases regulate key cellular pathways including Akt, BMP, insulin metabolism, hypoxia, and ubiquitination.
  • Understanding trb3's role in vertebrate development is essential.

Purpose of the Study:

  • To investigate the expression patterns and functional roles of trb3 in zebrafish embryonic development.
  • To elucidate trb3's involvement in TGF-signaling and left-right axis patterning.

Main Methods:

  • Spatiotemporal expression analysis of trb3 transcripts during zebrafish embryogenesis.
  • Over-expression and morpholino-mediated knockdown experiments to assess trb3 function.
  • Analysis of TGF-signaling pathway components, including smurf1 transcript levels.

Main Results:

  • trb3 transcripts are abundant throughout zebrafish embryogenesis, localized to mesendodermal cells in the late blastula phase.
  • trb3 over-expression causes ventralization, while knockdown affects heart, liver, pancreas, and gut positioning.
  • Constitutive TGF-signaling activation increases trb3 levels, and trb3 over-expression reduces smurf1 transcripts.

Conclusions:

  • trb3 plays a significant role in zebrafish embryonic development, affecting organogenesis and gut looping.
  • trb3 functions as a component of the TGF-signaling pathway.
  • trb3 is proposed to govern left-right axis patterning in vertebrate embryonic development.