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Related Experiment Videos

Towards quantitative in situ hybridization

A Jonker1, P A de Boer, M J van den Hoff

  • 1Department of Anatomy and Embryology, Academical Medical Centre, University of Amsterdam, The Netherlands.

The Journal of Histochemistry and Cytochemistry : Official Journal of the Histochemistry Society
|March 1, 1997
PubMed
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In situ hybridization is now a validated quantitative technique for measuring tissue mRNA levels. This method allows for sensitive mRNA quantification within specific cells, aiding biological research.

Area of Science:

  • Molecular Biology
  • Histology
  • Biochemistry

Background:

  • In situ hybridization (ISH) is crucial for studying RNA within tissue morphology.
  • Quantification of ISH signals has historically lacked acceptance as a reliable method.
  • Standardization is needed to validate ISH for accurate mRNA concentration analysis.

Purpose of the Study:

  • To rigorously evaluate the quantitative capabilities of in situ hybridization for tissue mRNA analysis.
  • To establish the reproducibility and sensitivity of the ISH protocol for RNA quantification.
  • To correlate ISH findings with established quantitative methods like Northern blot analysis.

Main Methods:

  • Utilized calibrated microscopic samples to assess autoradiographic signal proportionality.

Related Experiment Videos

  • Validated reproducibility across all ISH protocol steps, including signal detection.
  • Employed 35S-labeled riboprobes for in situ hybridization in liver and intestinal tissue sections.
  • Compared ISH-derived silver grain density with Northern blot analysis results.

    • Main Results:

    • Autoradiographic signal intensity directly correlated with radioactivity, exposure time, and emulsion development time.
    • Reproducible results were achieved throughout the in situ hybridization procedure.
    • Integrated silver grain density in tissue sections showed a direct proportion to Northern blot signals.
    • Carbamoylphosphate synthetase (CPS) mRNA levels per cell remained constant, but total organ levels decreased due to fewer expressing cells.

    Conclusions:

    • In situ hybridization is a validated, sensitive, and reproducible quantitative technique for measuring mRNA.
    • ISH allows for the precise localization of mRNA within specific cell types in tissues.
    • The study demonstrates the utility of quantitative ISH in understanding tissue-specific gene expression changes, exemplified by CPS mRNA regulation in the intestine.