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Genomic context sensitizes regulatory elements to genetic disruption.

Raquel Ordoñez1, Weimin Zhang1, Gwen Ellis1

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|May 17, 2024
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Summary

Genomic context shapes gene regulation, but is hard to study. This research used synthetic genomics to dissect the Igf2/H19 locus, revealing hidden regulatory dependencies and enhancer context sensitivity.

Keywords:
enhancer selectivitygene regulationgenetic engineeringgenome writinggenomic regulatory architecturesynthetic regulatory genomics

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Area of Science:

  • Genomics
  • Molecular Biology
  • Epigenetics

Background:

  • Genomic context is crucial for gene regulatory function.
  • The mouse Igf2/H19 locus serves as a model for enhancer selectivity, controlled by CTCF.
  • Understanding locus architecture is key to deciphering gene regulation.

Purpose of the Study:

  • To systematically dissect the architecture of the Igf2/H19 locus using synthetic regulatory genomics.
  • To identify previously uncharacterized long-range regulatory dependencies.
  • To investigate enhancer selectivity and context sensitivity genome-wide.

Main Methods:

  • Utilized synthetic regulatory genomics to replace the native Igf2/H19 locus with large payloads.
  • Performed enhancer deletion and ectopic delivery experiments.
  • Analyzed regulatory DNA actuation across diverse cell types.

Main Results:

  • Revealed previously unknown long-range regulatory dependencies at the native Igf2/H19 locus.
  • Demonstrated that H19 enhancers require native surroundings, while the Sox2 locus control region (LCR) functions autonomously.
  • Identified enhancer clusters as representative of broader context sensitivity in the genome.

Conclusions:

  • Unexpected regulatory dependencies impact even well-studied genetic loci.
  • Synthetic genomics enables large-scale manipulation of complete loci for functional studies.
  • The study provides a framework for investigating the relationship between regulatory architecture and function.