FISH Detection on DAPI—Banded Chromosomes

  • Henry H. Q. Heng
  • Lap-Chee Tsui
Part of the Methods in Molecular Biology™ book series (MIMB, volume 33)


Fluorescence in situ hybridization (FISH) techniques are routinely used in physical mapping studies to determine the regional localization of gene and DNA sequences on human metaphase chromosomes (1). It is often difficult, however, to precisely position the hybridization signals with respect to the conventional chromosome bands. Various approaches have been introduced, including G banding before or after FISH detection (2, 3), cohybridization with Alu or L 1 probes to generate R or G bands (4), use of a combination of various fluorescent dyes, such as quinacrine, Hoechst 33258, or DAPI, with FISH detecting reagents (5, 6), and triple staining with chromomycin, distamycin A, and DAPI (7, 8). Unfortunately, these procedures are not widely used because they are time-consuming and require extensive imaging equipment or careful quality control to be reproducible.


Propidium Iodide Wash Solution Yeast Artificial Chromosome Denaturation Time DAPI Banding 
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Copyright information

© Humana Press Inc. 1994

Authors and Affiliations

  • Henry H. Q. Heng
    • 1
    • 2
  • Lap-Chee Tsui
    • 1
    • 2
  1. 1.Department of Molecular and Medical GeneticsUniversity of TorontoTorontoCanada
  2. 2.Department of GeneticsThe Hospital for Sick ChildrenTorontoCanada

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