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Updated: Aug 7, 2026
08:20
A New Toolkit for Evaluating Gene Functions using Conditional Cas9 Stabilization
Published on: September 2, 2021
Programmable transcriptional condensates for enhanced CRISPR-based gene regulation
Aolin Li1,2, Congcong Cao3, Chunyan Yang1
1Shenzhen Institute of Translational Medicine, Shenzhen Second People's Hospital, The First Affiliated Hospital of Shenzhen University, Health Science Center, Shenzhen University, Shenzhen 518035, China.
Theranostics
|August 6, 2026
Summary
We developed a CRISPR-condensate platform for enhanced gene activation and repression. This system significantly boosts transcriptional output and specificity using fewer components, advancing CRISPR technology for research and therapy.
Area of Science:
- Molecular Biology
- Gene Regulation
- Biotechnology
Background:
- CRISPR-Cas9 technology revolutionized gene editing but current CRISPR activation/repression (CRISPRa/i) systems have limited potency and require complex delivery.
- This limits their widespread application in research and therapeutic development.
Purpose of the Study:
- To develop a novel CRISPR-condensate platform to enhance gene activation and repression efficiency and specificity.
- To reduce the complexity of CRISPRa/i delivery systems.
Main Methods:
- Engineered a modular CRISPR-condensate platform using a single-guide RNA (sgRNA) appended with an RNA nanostar.
- The nanostar recruits transcriptional effectors (VP64 for activation, KRAB for repression) via MS2 stem-loops and MCP fusion proteins.
- Utilized live-cell imaging, RT-qPCR, ChIP-seq, RNA-seq, and CUT&Tag to assess condensate formation, targeting, and transcriptional output in various cell lines.
Main Results:
- Achieved 50-100-fold gene activation and 20-30-fold repression, significantly outperforming direct effector fusion methods.
- Demonstrated high target specificity with minimal off-target effects.
- Enabled simultaneous multiplexed gene activation and repression using orthogonal systems and bidirectional regulation at a single locus.
- Required only three independently expressible components with minimal immune response and high cell viability.
Conclusions:
- The CRISPR-condensate system offers dramatically enhanced transcriptional efficacy and reduced component complexity for precise gene regulation.
- This platform leverages biomolecular condensation to improve CRISPR gene regulation, paving the way for advancements in functional genomics, cell engineering, and therapeutic applications.
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