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Related Experiment Video

Updated: Mar 14, 2026

Multiplexed Single Cell mRNA Sequencing Analysis of Mouse Embryonic Cells
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Mapping a multiplexed zoo of mRNA expression.

Harry M T Choi1, Colby R Calvert1, Naeem Husain1

  • 1Division of Biology & Biological Engineering, California Institute of Technology, Pasadena, CA 91125, USA.

Development (Cambridge, England)
|October 6, 2016
PubMed
Summary

Hybridization chain reaction (HCR) enables multiplexed in situ mRNA expression mapping across diverse organisms. This technique simplifies complex experiments, offering deep penetration and subcellular resolution for biological research.

Keywords:
Bacteria, Whole-mount embryos and larvaeDeep sample penetrationHigh contrastHybridization chain reaction (HCR)In situ amplificationIn situ hybridizationMultiplexingSubcellular resolutionTissue sections

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Area of Science:

  • Molecular Biology
  • Developmental Biology
  • Genomics

Background:

  • In situ hybridization is crucial for mapping mRNA expression in biological specimens.
  • Multiplexed mRNA analysis is vital for understanding gene regulation but is often complex.
  • Existing methods for multiplexed in situ hybridization are cumbersome in many model organisms.

Purpose of the Study:

  • To develop and demonstrate a versatile method for multiplexed in situ mRNA detection.
  • To overcome the limitations of current techniques in terms of experimental complexity and organismal scope.
  • To provide a tool for high-resolution spatial transcriptomics across diverse biological systems.

Main Methods:

  • Utilized programmable in situ amplifiers based on the hybridization chain reaction (HCR) mechanism.
  • Applied multiplexed in situ HCR across a wide range of model organisms, including bacteria, nematodes, fruit flies, sea urchins, zebrafish, chickens, and mice.
  • Tested the method on formalin-fixed paraffin-embedded human tissue sections.

Main Results:

  • Demonstrated successful multiplexed in situ HCR in bacteria, whole-mount embryos (nematode, fruit fly, sea urchin, zebrafish, chicken, mouse), and human tissue sections.
  • Showcased the ability of in situ HCR to achieve deep sample penetration, high contrast, and subcellular resolution.
  • Validated the independence of experimental timeline from the number of target mRNAs analyzed.

Conclusions:

  • Multiplexed in situ HCR offers a simplified and scalable approach for mapping multiple mRNA targets simultaneously.
  • The technique provides high-quality imaging across diverse biological specimens and experimental settings.
  • In situ HCR is a powerful and broadly applicable tool for studying complex gene expression patterns in biological research.