Mapping small DNA sequences by fluorescence in situ hybridization directly on banded metaphase chromosomes

Y. Fan, L. M. Davis, T. B. Shows

Research output: Contribution to journalArticlepeer-review

181 Scopus citations


A procedure for mapping small DNA probes directly on banded human chromosomes by fluorescence in situ hybridization has been developed. This procedure allows for the simultaneous visualization of banded chromosomes and hybridization signal without overlaying two separate photographic images. This method is simple and rapid, requires only a typical fluorescence microscope, has proven successful with DNA probes as small as 1 kilobase, is applicable for larger probes, and will greatly facilitate mapping the vast number of probes being generated to study genetic disease and define the human genome. Human metaphase chromosomes were prepared from phytohemagglutinin-stimulated lymphocyte cultures synchronized with bromodeoxyuridine and thymidine. Probes were labeled with biotin-dUTP, and the hybridization signal was amplified by immunofluorescence. Chromosomes were stained with both propidium iodide and 4′,6-diamidino-2-phenylindole (DAPI), producing R- and Q-banding patterns, respectively, allowing unambiguous chromosome and band identification while simultaneously visualizing the hybridization signal. Thirteen unique DNA segments have been localized to the long arm of chromosome 11 by using this technique, and localization of 10 additional probes by using radioactive in situ hybridization provides a comparison between the two procedures. These DNA segments have been mapped to all long-arm bands on chromosome 11 and in regions associated with neoplasias and inherited disorders.

Original languageEnglish (US)
Pages (from-to)6223-6227
Number of pages5
JournalProceedings of the National Academy of Sciences of the United States of America
Issue number16
StatePublished - 1990
Externally publishedYes


  • Biotinylated probes
  • Bromodeoxyuridine synchronization
  • Chromosome 11 mapping
  • Fluorescent detection of small probes
  • Simultaneous visualization of chromosome bands and signal

ASJC Scopus subject areas

  • Genetics
  • General


Dive into the research topics of 'Mapping small DNA sequences by fluorescence in situ hybridization directly on banded metaphase chromosomes'. Together they form a unique fingerprint.

Cite this