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Shadow enhancers modulate distinct transcriptional parameters that differentially effect downstream patterning

Peter H Whitney1, Bikhyat Shrestha1, Jiahan Xiong1

  • 1Department of Biology, New York University, New York, NY 10003, USA.

Development (Cambridge, England)
|October 20, 2022
PubMed
Summary

Drosophila shadow enhancers controlling short gastrulation (sog) gene expression exhibit distinct spatial and temporal activities. Their differential contributions ensure robust embryonic development despite genetic or environmental challenges.

Keywords:
DrosophilaMS2 live imagingMorphogen gradientShadow enhancersTranscriptional kinetics

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Area of Science:

  • Developmental Biology
  • Gene Regulation
  • Drosophila melanogaster research

Background:

  • Early Drosophila development relies on numerous enhancers for precise gene transcription.
  • Shadow enhancers provide robustness against perturbations by controlling gene expression.
  • The functional divergence within shadow enhancer pairs is poorly understood.

Purpose of the Study:

  • To characterize the distinct roles of the shadow enhancer pair for the short gastrulation (sog) gene.
  • To investigate how individual enhancers contribute to transcriptional kinetics and downstream patterning.

Main Methods:

  • Deletion of individual shadow enhancers (intronic proximal and upstream distal) for the sog gene.
  • Monitoring of sog transcriptional kinetics, including spatial expression, activation timing, and RNA Polymerase II loading.
  • Computational modeling of enhancer activities and integration of regulatory signals.
  • Analysis of downstream tissue patterning consequences.

Main Results:

  • Each sog shadow enhancer displays unique spatial expression patterns and activation kinetics.
  • Differential RNA Polymerase II loading rates were observed between the two enhancers.
  • Activation is additive, while repression involves synergistic interactions between enhancers.
  • Loss of individual enhancers leads to specific changes in embryonic tissue patterning.

Conclusions:

  • Divergent activities of shadow enhancers fine-tune gene expression robustness.
  • Differential enhancer kinetics explain observed downstream developmental outcomes.
  • Shadow enhancers integrate regulatory signals distinctly to ensure precise transcriptional output.