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Eva Jiménez-Guri1,2,3, Karl R Wotton1,2, Johannes Jaeger1,2

  • 1EMBL/CRG Research Unit in Systems Biology, Centre de Regulació Genòmica (CRG), The Barcelona Institute of Science and Technology (BIST), Dr. Aiguader 88, 08003 Barcelona, Spain.

Royal Society Open Science
|September 19, 2018
PubMed
Summary
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In Clogmia albipunctata, tarsal-less (tal) is expressed and regulated like a gap gene. However, Ca-tal does not function as a gap gene, despite its homologue

Area of Science:

  • Developmental biology
  • Insect embryogenesis
  • Gene regulation

Background:

  • Gap genes orchestrate early embryonic patterning in insects.
  • A region lacking gap gene expression exists in the Clogmia albipunctata blastoderm.
  • The tarsal-less (tal) gene's role in this region is unknown.

Purpose of the Study:

  • To investigate the function of tarsal-less (tal) in Clogmia albipunctata.
  • To determine if Ca-tal acts as a non-canonical gap gene.
  • To understand Ca-tal's interaction with known gap genes.

Main Methods:

  • RNA interference (RNAi) to deplete Ca-tal.
  • Analysis of gene expression patterns.
  • Examination of embryonic cuticle phenotypes.
Keywords:
Clogmia albipunctatadevelopmental evolutiongap gene systempattern formationpolycistronic genetarsal-less (tal)

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Main Results:

  • Ca-tal is expressed in the previously uncharacterized region of the C. albipunctata blastoderm.
  • Ca-tal is regulated by gap genes but has minimal impact on other gap genes or Ca-tll.
  • Depletion of Ca-tal does not result in canonical gap gene phenotypes.

Conclusions:

  • Ca-tal exhibits gap gene-like expression and regulation.
  • Ca-tal does not function as a gap gene in C. albipunctata development.
  • This suggests a divergence in gap gene network evolution.