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Related Experiment Videos

In situ hybridisation: principles and applications.

L M Looi1, P L Cheah

  • 1Department of Pathology, Faculty of Medicine, University of Malaya, Kuala Lumpur.

The Malaysian Journal of Pathology
|December 1, 1992
PubMed
Summary

In situ hybridisation (ISH) allows visualization of nucleic acids in cells, offering advantages over other methods in anatomical pathology. This technique is increasingly used in diagnostics for detecting infectious agents.

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Area of Science:

  • Molecular Biology
  • Histopathology
  • Genetics

Background:

  • In situ hybridisation (ISH) utilizes labelled probes for nucleic acid detection within intact cells or tissues.
  • It offers superior cellular localization compared to methods analyzing extracted nucleic acids.
  • ISH is favored by histopathologists due to its resemblance to immunohistochemistry.

Purpose of the Study:

  • To highlight the principles and advantages of in situ hybridisation (ISH).
  • To discuss the application of ISH in anatomical pathology and diagnostics.
  • To compare different probe labeling methods and their impact on ISH.

Main Methods:

  • Utilizing complementary DNA or RNA probes with radioactive or non-radioactive labels (biotin, digoxigenin).
  • Optimizing tissue fixation and hybridization conditions for signal strength and morphology.
  • Applying ISH for the detection of various infective agents in tissue sections.

Main Results:

  • Non-isotopic labels, particularly biotin and digoxigenin, offer sensitivity comparable to radioactive probes.
  • Achieving a balance between morphological preservation and hybridization signal is critical for ISH success.
  • ISH has demonstrated efficacy in detecting numerous viral, bacterial, and parasitic agents.

Conclusions:

  • In situ hybridisation is a valuable tool for localizing nucleic acids within their cellular context.
  • Optimized ISH protocols, especially with non-isotopic labels, provide sensitive and specific detection.
  • ISH is transitioning from a research tool to a significant diagnostic method in histopathology.

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