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CRISPR-assisted transcription activation by phase-separation proteins.

Jiaqi Liu1, Yuxi Chen1, Baoting Nong1,2

  • 1State Key Laboratory of Biocontrol, MOE Key Laboratory of Gene Function and Regulation and Guangzhou Key Laboratory of Healthy Aging Research, School of Life Sciences, Sun Yat-sen University, Guangzhou 510275, China.

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|March 11, 2023
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Summary

Researchers enhanced CRISPR-activation (CRISPRa) by fusing phase-separation proteins to dCas9-VPR. The dCas9-VPR-FUS IDR system significantly boosted gene activation efficiency and simplified the platform.

Keywords:
CRISPRphase-separation proteinstranscriptional activation

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Area of Science:

  • Molecular Biology
  • Gene Editing Technologies
  • Biotechnology

Background:

  • The clustered regularly interspaced short palindromic repeats (CRISPR)-Cas9 system is a powerful tool for genome engineering and gene regulation.
  • Existing CRISPR-activation (CRISPRa) systems often require multiple components due to suboptimal transcriptional activation efficiency.

Purpose of the Study:

  • To improve the efficiency and simplicity of CRISPRa platforms.
  • To investigate the potential of phase-separation proteins in enhancing dCas9-mediated transcriptional activation.

Main Methods:

  • Fusion of various phase-separation proteins to the dCas9-VPR (dCas9-VP64-P65-RTA) transcriptional activator.
  • Evaluation of enhanced CRISPRa systems, particularly dCas9-VPR fused with human NUP98 and FUS IDR domains.
  • Comparative analysis of dCas9-VPR-FUS IDR (VPRF) against other CRISPRa systems for activation efficiency and simplicity.

Main Results:

  • Fusion with phase-separation proteins, specifically human NUP98 and FUS IDR, significantly increased transcriptional activation efficiency.
  • The dCas9-VPRF system demonstrated superior activation efficiency and system simplicity compared to other tested CRISPRa platforms.
  • dCas9-VPRF effectively overcame target strand bias and expanded guide RNA design flexibility without increasing off-target effects.

Conclusions:

  • Phase-separation proteins can be effectively utilized to enhance gene expression regulation.
  • The dCas9-VPRF system offers a simplified and highly efficient CRISPRa platform with broad applicability in research and clinical settings.