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        Classical and Molecular Cytogenetic Analysis

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        693
        Cytogenetic analysis is performed on cell cultures for several reasons, notably, to perform identity checks by verifying species of origin or the retention of key chromosome rearrangements in cell lines described previously. De novo chromosome analysis is usually performed when characterizing cancer cell lines for the presence of neoplastic rearrangements associated with specific tumors. This usually involves fluorescence in situ hybridization (FISH) using clones covering gene loci near recurrent chromosome breakpoints. Chromosome breakage is an important endpoint in radiation biology and mutagenesis, enabling cell lines to be used for measuring genotoxic dosage and repair. Finally, cytogenetic analysis may be performed to monitor stability in culture. Unlike most preparative techniques, chromosome preparation resists standardization. Hence, procedures must be optimized for each cell line. Thus, evidence-based protocols are described for hypotonic harvesting, rapid G-banding, FISH, and Spectral Karyotyping (SKY) analysis of cell cultures to allow troubleshooting and fine-tuning to suit the requirements of individual cell lines.
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