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Related Experiment Videos

Evolution of Ftz protein function in insects.

C R Alonso1, J Maxton-Kuechenmeister, M Akam

  • 1Laboratory for Development and Evolution, Department of Zoology, University of Cambridge, Downing Street, Cambridge CB2 3EJ, United Kingdom.

Current Biology : CB
|September 22, 2001
PubMed
Summary
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The grasshopper Ftz protein poorly performs fruit fly segmentation roles but effectively rescues central nervous system defects, indicating conserved Ftz protein function in the CNS but divergence in segmentation.

Area of Science:

  • Developmental Biology
  • Genetics
  • Evolutionary Biology

Background:

  • The fushi tarazu (ftz) gene in Drosophila melanogaster is a key transcriptional regulator involved in embryonic segmentation, neural development, and hindgut formation.
  • An orthologous ftz gene (Sg-ftz) has been identified in the grasshopper Schistocerca gregaria, with expression patterns suggesting both conserved and diverged functions compared to Drosophila.

Purpose of the Study:

  • To investigate functional differences between the Drosophila Ftz (Dm-Ftz) and Schistocerca Ftz (Sg-Ftz) proteins.
  • To determine if conserved or species-specific sequences mediate the distinct developmental roles of ftz.

Main Methods:

  • Expression of both Sg-Ftz and Dm-Ftz proteins in Drosophila embryos.
  • Assay of protein function in key developmental processes, including segmentation (engrailed activation, wingless repression, cuticle formation) and central nervous system (CNS) development.

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Main Results:

  • Sg-Ftz demonstrated poor mimicry of Dm-ftz's segmentation functions, including engrailed activation, wingless repression, and embryonic cuticle transformation.
  • Both Sg-Ftz and Dm-Ftz proteins were similarly effective in rescuing a CNS-specific ftz mutant.
  • These results highlight differential functional conservation between the two Ftz orthologs.

Conclusions:

  • The CNS function of the Ftz protein appears to be mediated by conserved protein domains.
  • Efficient pair-rule segmentation function requires specific sequences found only in the Drosophila melanogaster Ftz protein.
  • This suggests a divergence in the evolutionary role of ftz, particularly in segmentation, between insects.