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Journal of Histochemistry and Cytochemistry, Vol. 45, 365-374, Copyright © 1997 by The Histochemical Society, Inc.
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SYMPOSIUM ARTICLE: 47th Annual Meeting of the Histochemical Society
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Signal Amplification in the Detection of Single-copy DNA and RNA by Enzyme-catalyzed Deposition (CARD) of the Novel Fluorescent Reporter Substrate Cy3.29-Tyramide
Brigitte F. Schmidta,
Jean Chaoa,
Zhengrong Zhua,
Robin L. DeBiasioa, and
Gregory Fishera
a Center for Light Microscope, Imaging and Biotechnology, Carnegie Mellon University, Pittsburgh, Pennsylvania
Correspondence to:
Brigitte F. Schmidt, Center for Light Microscope, Imaging and Biotechnology, Carnegie Mellon Univ., 4400 Fifth Ave., Pittsburgh, PA 15213.
We demonstrate that the CAtalyzed Reporter Deposition method (CARD), utilizing the novel fluorescent reporter Cy3.29-tyramide, is successful in the Fluorescent In Situ Hybridization (FISH) detection of RNA and single-copy DNA. Histone 4 expression is detected in RNA extracts of S-phase, synchronized HeLa cells by dot-blot analysis. Gene expression of histone 4 in HeLa cells is demonstrated by FISH via CARD, utilizing oligonucleotide probes. Fluorescence intensity measurements on CARD-amplified histone 4 RNA detection showed (a) a 25-fold amplification of the signal brightness by biotinylated oligonucleotide probes and (b) a sixfold amplification of the signal brightness by horseradish peroxidase (HRP)-labeled histone 4 probes vs the directly stained control. The sensitivity of the CARD method is demonstrated by the FISH detection of single-copy DNA on human corneal fibroblast and HeLa S3 interphase nuclei. Chromosomal localization of the single copy DNA is demonstrated on HeLa S3 metaphase chromosome spreads. (J Histochem Cytochem 45:365-373, 1997)
Key Words:
FISH (fluorescent in situ hybridization), nucleic acid detection, Cy3.29-tyramide

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The Journal of Histochemistry & Cytochemistry
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