Recently, it was shown that anterior-posterior patterning genes in the red flour beetle Tribolium castaneum are expressed sequentially in waves. However, in the fruit fly Drosophila melanogaster, an insect with a derived mode of embryogenesis compared to Tribolium, anterior-posterior patterning genes quickly and simultaneously arise as mature gene expression domains that, afterwards, undergo slight posterior-to-anterior shifts. This raises the question of how a fast and simultaneous mode of patterning, like that of Drosophila, could have evolved from a rather slow sequential mode of patterning, like that of Tribolium. In this paper, we elucidate a mechanism for this evolutionary transition based on a switch from a uniform to a gradient-mediated initialization of the gap gene cascade by maternal Hb. The model is supported by computational analyses and experiments.
Speeding up anterior-posterior patterning of insects by differential initialization of the gap gene cascade
Heike Rudolf,Christine Zellner,Ezzat El-Sherif
Published 2018 in bioRxiv
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- Publication year
2018
- Venue
bioRxiv
- Publication date
2018-12-02
- Fields of study
Biology, Medicine
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Semantic Scholar, PubMed
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