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Cancer Genome Characterization Initiative

Visit the database of genomic characterization data for multiple tumor types.


Digital Karyotyping Data Viewer (DKView)

Digital karyotyping is a sequence-based method for detecting genomic amplifications and deletions. It works by counting the relative frequency of experimentally observed tags which are mapped to a set of approximately 800,000 predicted (virtual) on the genome.

Virtual DK tags are based on the following build of the human genome:

NCBI Build Number: 37
Version: 1
Release date: 04 August 2009
For a detailed description of the method, see the following:
Tian-Li Wang, Christine Maierhofer, Michael R. Speicher, Christoph Lengauer, Bert Vogelstein, Kenneth W. Kinzler, and Victor E. Velculescu. Digital karyotyping. PNAS 99(25):16156-16161.
Additional information about digital karyotyping can be found at www.digitalkaryotyping.org

The CGAP Digital Karyotyping Data Viewer (DKView) can be used to visualize digital karyotpying libraries in the CGAP database or to view your own data.

View CGAP DK libraries
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View Your Own DK Data
  • Begin by uploading your file of DK experimental tags with observed frequencies. The program will map these observed tags to the approximately 800,000 virtual DK tags across the genome
  • When the program has completed this task, you will be prompted to enter a window size for smoothing the data, as well as parameters to guide the search for regions of amplification or deletion.
  • When the program has finished smoothing the data and searching for regions of amplification or deletion, it will display a table of all such regions that were found. Hyperlinked entries in the last three columns of the table connect to graphic plots of the region of interest, to the UCSC genome browser, and to downloads of the observed DK tags in the region. There is also a hyperlink to a page with full-chromosome plots for all chromosomes.
  • In addition to a plot of the region of interest, a page with a detailed plot of a region will show a plot of the whole chromosome. Clicking on a portion of the whole-chromosome plot will give cause a detailed plot of the selected region to be displayed. At the bottom of a detail page, there are options to change the window size for smoothing and to change the region of interest. To get a detailed view of a region of any of the chromosomes, click on the region. The detailed
1. Enter the name of the file containing the list of tags and their frequences.
2. Submit query:

File Format

  • The file should NOT contain the same tag more than once.
  • Tags should be all uppercase.
  • The text file must list the tags and their frequences, separated by a tab, in a vertical column like this:
    ATGAAGATGGAATGGGT   3
    CTGCTTGCGTGAGATTC   1
    TAATTCTCATCGTCTGC   8
    GCTGATATTTAAAAGAG   5