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A novel triple-color detection procedure for brightfield microscopy, combining in situ hybridization with immunocytochemistry
EJ Speel, MP Jansen, FC Ramaekers and AH Hopman
Department of Molecular Cell Biology & Genetics, University of Limburg, Maastricht, The Netherlands.
We describe a fast light microscopic procedure for the simultaneous enzyme cytochemical detection of three different DNA target sequences in contrasting colors in both interphase and metaphase cell preparations. Chromosome-specific DNA probes labeled with either biotin, digoxygenin, or fluorescein were hybridized as a mixture and detected clearly and accurately by precipitates of the horseradish peroxidase-diaminobenzidine (PO-DAB, brown color), alkaline phosphatase- Fast Red (APase-Fast Red, red color), or horseradish peroxidase- tetramethylbenzidine (PO-TMB, green color) reaction, respectively. The PO-TMB reaction product was stabilized effectively by the addition of sodium tungstate to the reaction mixture, thus making the PO-TMB reaction now generally applicable to in situ hybridization (ISH). To avoid mixing of the precipitates of the two PO reactions used in the triple-color ISH method, the first detected PO activity was always completely inactivated by a mild acid treatment before the second one was applied. Finally, the cell preparations were embedded in a thin protein layer cross-linked by formaldehyde to ensure permanent stabilization of the enzyme reaction products and optimal visualization of color contrast. The triple-color ISH detection procedure could be combined with beta-galactosidase-5-bromo-4-chloro-3-indolyl-beta- D- galactoside (beta-Gal-BCIG) immunocytochemistry (ICC), leading to the simultaneous localization of multiple DNA targets and a protein target in the same cell. The described procedure may therefore be a valuable tool in the areas of cytogenetics, cell biology, and molecular pathology.
Volume 42,
Issue 10,
pp. 1299-1307,
10/01/1994
Copyright © 1994 by The Histochemical Society
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