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Related Concept Videos

In-situ Hybridization02:31

In-situ Hybridization

In situ hybridization (ISH) is a technique used to detect and localize specific DNA or RNA molecules in cells, tissue, or tissue sections using a labeled probe. The technique was first used in 1969 for the investigation of nucleic acids. It is currently an essential tool in scientific research and clinical settings, especially for diagnostic purposes.
Types of probes and labels
A probe is a complementary strand of DNA or RNA that binds to corresponding nucleotide sequences in a cell. Many...
FISH - Fluorescent In-situ Hybridization02:07

FISH - Fluorescent In-situ Hybridization

Fluorescence in situ hybridization, or FISH, was developed in the early 1980s and has quickly become one of the most widely used techniques in cytogenetics. Labeled probes are used to bind complementary DNA or RNA sequences on a chromosome or in a region within a cell. Earlier, the probes could only be obtained by cloning or reverse transcription of a DNA template. Currently, the probe oligonucleotides can be synthesized synthetically. Additionally, with the advancement of optical techniques,...

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Related Experiment Video

Updated: Jul 13, 2026

Clinicopathological Analysis of miRNA Expression in Breast Cancer Tissues by Using miRNA In Situ Hybridization
06:01

Clinicopathological Analysis of miRNA Expression in Breast Cancer Tissues by Using miRNA In Situ Hybridization

Published on: June 7, 2016

Metallographic in situ hybridization.

Richard D Powell1, James D Pettay, William C Powell

  • 1Nanoprobes, Incorporated, 95 Horseblock Road, Unit 1, Yaphank, NY 11980, USA. rpowell@nanoprobes.com

Human Pathology
|July 21, 2007
PubMed
Summary

Metallographic methods enhance in situ hybridization (ISH) sensitivity and resolution for gene detection. This novel enzyme metallography technique, including silver ISH, offers superior visualization in breast cancer diagnostics.

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Area of Science:

  • Biotechnology
  • Molecular Biology
  • Pathology

Background:

  • Metallographic methods utilize probes or antibodies to deposit metal at target binding sites.
  • Autometallographically enhanced gold labeling offers higher sensitivity than conventional enzyme chromogens.
  • Enzyme metallography enables direct metal deposition from solution via enzymatic probes.

Purpose of the Study:

  • To develop novel bright-field in situ hybridization (ISH) methods for gene determination.
  • To achieve high sensitivity and resolution for visualizing gene copies in various tissues.
  • To enable copy enumeration in amplified tissues without specialized optics.

Main Methods:

  • Development of bright-field ISH using enzyme metallography for HER2 gene determination.
  • Application of enzyme metallography for visualizing endogenous and amplified gene copies.
  • Creation of an automated enzyme metallography procedure, silver ISH, for slide-staining instruments.

Main Results:

  • Enzyme metallography provides superior sensitivity and resolution for ISH.
  • The method allows visualization of endogenous gene copies and enumeration of amplified copies.
  • Automated silver ISH is suitable for clinical slide-staining instruments.
  • Metallographic staining also shows promise for immunohistochemistry and multiplex detection.

Conclusions:

  • Enzyme metallography represents a significant advancement in bright-field ISH detection.
  • This technique offers high sensitivity and resolution for gene analysis in pathology.
  • Metallographic staining is versatile and can be combined with other methods for multiplex analyses.