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Related Experiment Video

Updated: Jul 27, 2025

A High Throughput in situ Hybridization Method to Characterize mRNA Expression Patterns in the Fetal Mouse Lower Urogenital Tract
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Gene expression detection in developing mouse tissue using in situ hybridization and µCT imaging.

Vilma Väänänen1, Mona M Christensen1, Heikki Suhonen2

  • 1Institute of Biotechnology, University of Helsinki, Helsinki FI-00014, Finland.

Proceedings of the National Academy of Sciences of the United States of America
|June 6, 2023
PubMed
Summary

Gene expression CT (GECT) uses enhanced silver and gold deposits to visualize gene activity in developing tissues using X-ray microtomography. This method provides spatially accurate 3D detection of gene expression, overcoming previous limitations.

Keywords:
developmentgene expressionin situ hybridizationµCT imaging

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Area of Science:

  • Biomedical Imaging
  • Developmental Biology
  • Molecular Biology

Background:

  • Soft-tissue X-ray microtomography (µCT) is a powerful 3D imaging technique for morphology and development.
  • A key limitation is the lack of molecular probes for visualizing gene activity with µCT.

Purpose of the Study:

  • To develop a novel method for 3D visualization of gene expression in developing tissues using µCT.
  • To establish gene expression CT (GECT) by combining in situ hybridization with enhanced metal deposition and µCT.

Main Methods:

  • Horseradish peroxidase-assisted reduction of silver and catalytic gold enhancement were applied to in situ hybridization.
  • Gene expression patterns were detected for collagen type II alpha 1 and sonic hedgehog in developing mouse tissues.
  • Expression patterns were visualized using laboratory µCT.

Main Results:

  • GECT successfully detected gene expression patterns comparable to alkaline phosphatase-based methods.
  • The method demonstrated compatibility with varying gene expression levels and region sizes.
  • GECT was shown to be compatible with phosphotungstic acid staining for enhanced contrast in µCT.

Conclusions:

  • Gene expression CT (GECT) is a viable method for 3D detection of gene expression in developing tissues.
  • GECT integrates with existing laboratory routines for spatially accurate imaging.
  • This technique expands the utility of µCT for molecular and developmental studies.