Cytogenetic analysis from DNA by comparative genomic hybridization |
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Authors: | Tachdjian G Aboura A Lapierre J M Viguié F |
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Affiliation: | Service de biologie du développement et de la reproduction-cytogénétique, h?pital Antoine-Béclère, 92140 Clamart, France. gerard.tachdjian@abc.ap-hop-paris.fr |
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Abstract: | Comparative genomic hybridization (CGH) is a modified in situ hybridization technique which allows detection and mapping of DNA sequence copy differences between two genomes in a single experiment. In CGH analysis, two differentially labelled genomic DNA (study and reference) are co-hybridized to normal metaphase spreads. Chromosomal locations of copy number changes in the DNA segments of the study genome are revealed by a variable fluorescence intensity ratio along each target chromosome. Since its development, CGH has been applied mostly as a research tool in the field of cancer cytogenetics to identify genetic changes in many previously unknown regions. CGH may also have a role in clinical cytogenetics for detection and identification of unbalanced chromosomal abnormalities. |
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