Molecular cytogenetic characterization of cancer cell alterations

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Abstract

Chromosomal abnormalities are the hallmark of cancer cells. Recurring and highly consistent structural and numerical alterations have been identified in a large number of leukemias, lymphomas, and solid tumors. The identification of recurrent genetic alterations and the isolation of molecular markers have clinical applications in the diagnosis and prognosis of neoplasia and in the detection of minimal residual disease that are essential for designing the most effective therapeutic approach. Polymerase chain reaction (PCR) and fluorescence in situ hybridization (FISH) are powerful techniques for detection of genomic alterations. The battery of FISH methods and DNA probes that are available can resolve virtually any chromosomal alterations regardless of their complexity. Combined chromosome banding, multifluor or spectral karyotype, and comparative genomic hybridization (CGH) allow identification of structural and numerical alterations on a global basis, mapping of the DNA copy number on the entire tumor genome, complete derivation of complex rearrangements, and localization of the breakpoints of translocations and deletions. Regions of recurrent alterations can be microdissected, amplified, microclone libraries constructed and probes localized on extended chromosomes or chromatin fibers for construction of high resolution physical maps that are critical for positional cloning and gene identification. In this review we attempted to cover the current trends in cancer molecular cytogenetics, and to outline the importance of molecular chromosome analysis in the understanding of oncogenesis and its clinical applications.

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