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Proceedings Paper

Spectral karyotyping (SKY) analysis of heritable effects of radiation-induced malignant transformation
Author(s): Horst Zitzelsberger; Jingly Fung; C. Janish; George McNamara; P. E. Bryant; A. C. Riches; Heinz-Ulli G. Weier
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Paper Abstract

Radiocarcinogenesis is widely recognized as occupational, environmental and therapeutical hazard, but the underlying mechanisms and cellular targets have not yet been identified. We applied SKY to study chromosomal rearrangements leading to malignant transformation of irradiated thyroid epithelial cells. SKY is a recently developed technique to detect translocations involving non-homologous based on unique staining of all 24 human chromosomes by hybridization with a mixture of whole chromosome painting probes. A tuneable interferometer mounted on a fluorescence microscope in front of a CCD camera allows to record the 400 nm - 1000 nm fluorescence spectrum for each pixel in the image. After background correction, spectra recorded for each pixel are compared to reference spectra stored previously for each chromosome-specific probe. Thus, pixel spectra can be associated with specific chromosomes and displayed in 'classification' colors, which are defined so that even small translocations become readily discernible. SKY analysis was performed on several radiation-transformed cell lines. Line S48T was generated from a primary tumor of a child exposed to elevated levels of radiation following the Chernobyl nuclear accident. Subclones were generated from the human thyroid epithelial cell line (HTori-3) by exposure to gamma or alpha irradiation. SKY analysis revealed multiple translocations and, combined with G-banding, allowed the definition of targets for positional cloning of tumor related genes.

Paper Details

Date Published: 6 May 1999
PDF: 7 pages
Proc. SPIE 3605, Three-Dimensional and Multidimensional Microscopy: Image Acquisition and Processing VI, (6 May 1999); doi: 10.1117/12.347579
Show Author Affiliations
Horst Zitzelsberger, Forschungszentrum fuer Umwelt und Gesundheit GmbH (Germany)
Jingly Fung, Univ. of California/San Francisco and Univ. of California/Berkeley (United States)
C. Janish, Applied Spectral Imaging, Inc. (United States)
George McNamara, Applied Spectral Imaging, Inc. (United States)
P. E. Bryant, School of Biomedical Sciences/Univ. of St. Andrews (United States)
A. C. Riches, School of Biomedical Sciences/Univ. of St. Andrews (United States)
Heinz-Ulli G. Weier, Univ. of California/Berkeley (United States)

Published in SPIE Proceedings Vol. 3605:
Three-Dimensional and Multidimensional Microscopy: Image Acquisition and Processing VI
Dario Cabib; Carol J. Cogswell; Jose-Angel Conchello; Jeremy M. Lerner; Tony Wilson, Editor(s)

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