Comparative Genomic Hybridization (CGH) is a molecular cytogenetic method for detecting chromosomal imbalances by comparing the copy number of DNA sequences in cells of tested tissue and the reference specimen. CGH is based on two-color fluorescence suppressive in situ hybridization of genomic test and reference DNAs, each labeled with a different fluorochrome, to metaphase chromosomes of a healthy individual. First described by Kallioniemi et al. in 1992, the CGH assay has been widely used for identification and characterization of both numerical and unbalanced structural chromosome abnormalities in cells of different tissues at various pathological conditions in humans, especially in tumor diseases. We discuss the specific features and quality control of comparative genomic hybridization, its advantages and limitations in detection of genomic imbalance and the prospects for development of this technology.
Russian Journal of Genetics – Springer Journals
Published: Oct 13, 2004
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