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Related Concept Videos

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Genome editing technologies allow scientists to modify an organism’s DNA via the addition, removal, or rearrangement of genetic material at specific genomic locations. These types of techniques could potentially be used to cure genetic disorders such as hemophilia and sickle cell anemia. One popular and widely used DNA-editing research tool that could lead to safe and effective cures for genetic disorders is the CRISPR-Cas9 system. CRISPR-Cas9 stands for Clustered Regularly Interspaced...
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Single-molecule live-cell RNA imaging with CRISPR-Csm.

Chenglong Xia1,2, David Colognori2,3, Xueyang Stephen Jiang2,3

  • 1California Institute for Quantitative Biosciences (QB3), University of California, Berkeley, CA, USA.

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|February 18, 2025
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Researchers developed single-molecule live-cell fluorescence in situ hybridization (smLiveFISH) to visualize unmodified RNA in living cells. This new method tracks native NOTCH2 and MAP1B transcripts, revealing their distinct cellular transport mechanisms.

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Area of Science:

  • Molecular Biology
  • Cell Biology
  • Genetics

Background:

  • Visualizing individual RNA molecules in real time within living cells is crucial for understanding cellular dynamics.
  • Current methods for live-cell imaging of endogenous RNA are limited in generalizability and resolution.
  • Unmodified, native RNA visualization remains a significant challenge in cell biology.

Purpose of the Study:

  • To develop a generalizable method for high-resolution, real-time imaging of single, unmodified endogenous RNA molecules in live cells.
  • To enable the tracking of specific native RNA transcripts and elucidate their dynamic behaviors.
  • To investigate RNA localization mechanisms and their role in cellular function.

Main Methods:

  • Developed single-molecule live-cell fluorescence in situ hybridization (smLiveFISH).
  • Utilized the CRISPR-Csm complex with multiplexed guide RNAs for programmable RNA targeting.
  • Applied the method to visualize and track native NOTCH2 and MAP1B transcripts in various cell types, including primary cells.

Main Results:

  • Successfully visualized and tracked individual native NOTCH2 and MAP1B RNA transcripts in living cells using smLiveFISH.
  • Identified distinct localization mechanisms: cotranslational translocation of NOTCH2 mRNA to the ER and directional transport of MAP1B mRNA to the cell periphery.
  • Demonstrated the robustness and generalizability of smLiveFISH across different cell types.

Conclusions:

  • smLiveFISH provides a powerful new tool for visualizing and studying endogenous RNA dynamics in live cells.
  • The method reveals novel insights into RNA transport and localization pathways.
  • This approach has the potential to advance our understanding of RNA's role in cellular processes and disease states.