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DNA probes are fragments of DNA labeled with a reporter tag to enable their detection or purification. The resulting labeled DNA probes can then hybridize to target nucleic acid sequences through complementary base-pairing, and may be used to recover or identify these regions.
Radioisotopes, fluorophores, or small molecule binding partners like biotin or digoxigenin, are the most widely used reporter tags for labeling DNA probes. These labels can be attached to the probe DNA molecule via...
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Designing a Hybrid Chain Reaction Probe for Multiplex Transcripts Assay with High-Level Imaging.

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Summary

This study introduces improved hybrid chain reaction (HCR) probes for enhanced signal amplification in multiplex FISH assays. The new ISRCA-HCR method significantly boosts imaging quality for spatial cell type and transcriptome analysis.

Keywords:
cell typesfluorescent in situ hybridization (FISH)hybrid chain reaction (HCR)rolling circle amplification (RCA)spatial transcriptome

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Area of Science:

  • Molecular Biology
  • Biotechnology
  • Genomics

Background:

  • Hybrid chain reaction (HCR) is an enzyme-free, isothermal amplification method widely used in fluorescent in situ hybridization (FISH).
  • Existing HCR methods suffer from time-consuming protocols and low signal efficiency, limiting their utility in transcriptomic assays.
  • There is a need for improved HCR strategies to enhance signal amplification and imaging quality for multiplex applications.

Purpose of the Study:

  • To develop novel orthogonal HCR hairpin-pair (hp) probes for efficient signal amplification in multiplex assays.
  • To enhance the efficiency and imaging capabilities of HCR-based multiplex FISH assays.
  • To create a simplified and more effective tool for spatial cell type and transcriptome analysis.

Main Methods:

  • Developed nine orthogonal HCR hairpin-pair (hp) probes.
  • Coupled fluorescent molecules to HCR hairpins via disulfide bonds for easy chemical cleavage, simplifying the workflow.
  • Combined HCR with in situ rolling circle amplification (ISRCA) to create the ISRCA-HCR technique.

Main Results:

  • The developed HCR probes enabled efficient signal amplification for multiplex assays.
  • The ISRCA-HCR technique achieved a significant 17-fold signal amplification.
  • ISRCA-HCR demonstrated high-level imaging capability, suitable for spatial cell type assays.

Conclusions:

  • The study presents a novel ISRCA-HCR method that overcomes limitations of existing HCR techniques.
  • The developed HCR probes and ISRCA-HCR strategy provide accurate, high-level signal amplification for multiplex FISH imaging.
  • This offers a powerful research tool for advanced transcriptome and spatial cell type analysis.