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Related Concept Videos

CRISPR01:59

CRISPR

46.4K
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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Updated: May 2, 2026

HOX Loci Focused CRISPR/sgRNA Library Screening Identifying Critical CTCF Boundaries
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Challenges in visualizing endogenous loci in the human genome using CRISPR-based imaging systems.

Mateusz Nowaczyk1, Konrad Kuczynski1, Łukasz Przybył1

  • 1Institute of Bioorganic Chemistry, Polish Academy of Sciences, Poznan, Poland.

Biotechnologia
|May 1, 2026
PubMed
Summary

CRISPR-based imaging advances DNA visualization in living cells. New methods improve labeling of nonrepetitive genomic loci, overcoming challenges like low signal and off-target binding for enhanced research.

Keywords:
CRISPR-Cas9CRISPR-based imagingDNA visualizationlive-cell imagingmethods

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biotechnology

Background:

  • CRISPR-Cas9 systems, utilizing nuclease-deactivated Cas9 (dCas9), enable DNA visualization by binding target sequences without inducing breaks.
  • Fluorescent labeling of dCas9 or single-guide RNA (sgRNA) allows for tracking genomic elements in living cells.
  • While effective for repetitive sequences, visualizing nonrepetitive loci via CRISPR imaging faces challenges.

Purpose of the Study:

  • To summarize recent advancements in labeling nonrepetitive genomic loci using CRISPR-based imaging.
  • To outline the key challenges hindering efficient CRISPR-based DNA visualization.
  • To present insights and experimental findings related to CRISPR imaging optimization.

Main Methods:

  • Utilizing nuclease-deactivated Cas9 (dCas9) complexed with single-guide RNA (sgRNA) for specific genomic targeting.
  • Employing fluorescent labeling of dCas9 or sgRNA components for visualization.
  • In vivo expression of system components for live-cell imaging.

Main Results:

  • CRISPR-based imaging successfully visualizes repetitive genomic sequences in living cells.
  • Visualization of nonrepetitive loci remains challenging due to low signal-to-noise ratios and off-target binding.
  • Intracellular delivery and sustained expression of CRISPR components are critical concerns.

Conclusions:

  • Recent advances aim to improve CRISPR-based imaging of nonrepetitive genomic loci.
  • Overcoming low signal, off-target binding, and delivery issues is crucial for advancing CRISPR imaging techniques.
  • Ongoing optimization is necessary for efficient and reliable CRISPR-based DNA visualization.