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LADL: light-activated dynamic looping for endogenous gene expression control.

Ji Hun Kim1, Mayuri Rege1,2, Jacqueline Valeri1

  • 1Department of Bioengineering, University of Pennsylvania, Philadelphia, PA, USA.

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Summary
This summary is machine-generated.

Scientists developed a new light-activated system to control genome folding. This technology rearranges DNA loops, showing potential for dynamic genome engineering and understanding gene regulation.

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Area of Science:

  • Genomics
  • Molecular Biology
  • Synthetic Biology

Background:

  • Mammalian genomes feature extensive long-range looping interactions crucial for function, but the dynamics and causality remain unclear.
  • Understanding the dynamic nature of genome folding is key to deciphering its regulatory mechanisms.

Purpose of the Study:

  • To engineer a novel system for light-induced, directed rearrangement of three-dimensional genome structures.
  • To investigate the functional consequences of altering specific DNA looping interactions.

Main Methods:

  • Development of a light-activated-dynamic-looping (LADL) system using synthetic architectural proteins.
  • CRISPR-Cas9 technology to target LADL to specific genomic loci (Klf4 and Zfp462).
  • Blue light-induced heterodimerization of cryptochrome 2 and dCas9-CIBN to control DNA looping.

Main Results:

  • Successfully redirected a stretch enhancer (SE) from Klf4 to the Zfp462 promoter using LADL.
  • Demonstrated a correlation between the de novo Zfp462-SE loop formation and a modest increase in Zfp462 gene expression via single-molecule RNA-FISH.
  • Showcased LADL's ability to induce genomic locus colocalization without chemical cofactors.

Conclusions:

  • The LADL system provides a novel, light-inducible method for precise genome architecture engineering.
  • This technology enables the study of dynamic genome folding and its impact on gene expression.
  • LADL offers a platform for future research into reversible and oscillatory DNA looping on short timescales.