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Fluorescence in situ hybridization, or FISH, was developed in the early 1980s and has quickly become one of the most widely used techniques in cytogenetics. Labeled probes are used to bind complementary DNA or RNA sequences on a chromosome or in a region within a cell. Earlier, the probes could only be obtained by cloning or reverse transcription of a DNA template. Currently, the probe oligonucleotides can be synthesized synthetically. Additionally, with the advancement of optical techniques,...
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Light-Scattering In Situ Imaging for Intracellular Gene Fusion Transcript Analysis at Single-Molecule Resolution.

Peiwen Huang1, Yutong Chen1, Fengxia Su1

  • 1Beijing Key Laboratory for Bioengineering and Sensing Technology; School of Chemistry and Biological Engineering, University of Science and Technology Beijing, 30 Xueyuan Road, Haidian District, Beijing 100083, P. R. China.

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This study introduces a novel, washing-free method using gold nanoparticles (AuNPs) for highly stable, single-molecule imaging of intracellular gene fusion transcripts. This technique enhances diagnostics for hematological malignancies like leukemia and lymphoma.

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Area of Science:

  • Molecular Biology
  • Nanotechnology
  • Medical Diagnostics

Background:

  • Intracellular gene fusion transcripts are vital in hematological malignancies.
  • Current fluorescence in situ hybridization (FISH) methods are limited by washing steps and photobleaching.

Purpose of the Study:

  • To develop a washing-free, photostable imaging platform for detecting intracellular gene fusion transcripts at single-molecule resolution.
  • To overcome limitations of existing FISH techniques for disease diagnostics.

Main Methods:

  • Developed a platform using gold nanoparticles (AuNPs) and resonance light scattering.
  • Employed in situ ligation and rolling circle amplification (RCA) for signal amplification.
  • Utilized AuNP-DNA probes for specific targeting of RCA products, forming plasmonic nanostructures.

Main Results:

  • Achieved single-molecule resolution imaging of intracellular fusion transcripts without washing steps.
  • Demonstrated photostable detection with low background signals due to AuNPs.
  • Enabled reliable imaging and enumeration of fusion transcripts in situ.

Conclusions:

  • The developed AuNP-based platform offers a robust, washing-free solution for imaging intracellular fusion transcripts.
  • This method has transformative potential for investigating gene fusions and advancing clinical diagnostics in malignancies.
  • The technique overcomes photobleaching and labor-intensive washing steps associated with traditional methods.