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Researchers developed a new CRISPR-based epigenome editing tool for highly multiplexed screens. This system enables simultaneous gene activation and repression to study complex genetic interactions and gene regulation.

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Area of Science:

  • Molecular Biology
  • Genomics
  • Epigenetics

Background:

  • Gene and cis-regulatory element (CRE) interactions are crucial for biological processes and disease.
  • Previous epigenome editing tools were limited to pairwise genetic interaction analysis.

Purpose of the Study:

  • To develop a highly multiplexed epigenome editing system for assessing complex genetic interactions.
  • To enable simultaneous gene activation and repression for comprehensive gene regulation studies.

Main Methods:

  • Utilized a hyper-efficient dCas12a (dHyperLbCas12a) system with long CRISPR RNA (crRNA) arrays for multiplexed epigenome editing.
  • Demonstrated compatibility with various activation (P300) and repression (SIN3A interacting domain - SID) domains.
  • Enabled simultaneous activation and repression using co-expressed dCas12a orthologues on a single crRNA array.

Main Results:

  • The dCas12a platform supports highly multiplexed epigenome editing and simultaneous gene activation/repression.
  • Successfully screened ~19,000 barcoded crRNA arrays to analyze CRE contributions to gene expression.
  • Dissected independent and combinatorial effects of CREs on dose-dependent gene expression control.

Conclusions:

  • The developed dCas12a system offers efficient, highly multiplexed epigenome editing capabilities.
  • This technology expands possibilities for studying gene regulation and genetic interactions in diverse biological systems.
  • Provides a powerful new tool for high-throughput genetic screens.