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Microarray-based comparative genomic hybridization (a-CGH) is a method to detect chromosome copy number changes, at a higher resolution level than conventional chromosome-based comparative genomic hybridization (CGH). Figure 1: Chromosome. ...
Comparative genomic hybridization (CGH) is a molecular-cytogenetic method for the analysis of regional changes in the DNA content of tumor cells. ...
Process
DNA from a tumor sample and normal reference sample are labelled differentially, using different fluorophores, and hybridized to several thousand probes. The probes are derived from most of the known genes and non-coding regions of the genome, printed on a glass slide. Space-filling model of a section of DNA molecule Deoxyribonucleic acid (DNA) is a nucleic acid that contains the genetic instructions specifying the biological development of all cellular forms of life (and most viruses). ...
This stylistic schematic diagram shows a gene in relation to the double helix structure of DNA and to a chromosome (right). ...
In biology the genome of an organism is the whole hereditary information of an organism that is encoded in the DNA (or, for some viruses, RNA). ...
The ratio of the fluorescence intensity of the tumor to that of the reference DNA is then calculated, to measure the copy number changes for a particular location in the genome. Fluorescence induced by exposure to ultraviolet light in vials containing various sized Cadmium selenide (CdSe) quantum dots. ...
Efficiency Using this method, copy number changes at a level of 5-10 kilobases of DNA sequences can be detected. This method allows to identify new recurrent chromosome changes such as A unit of measurement in genetics denoting a length of 1000 nucleotides (bases) of DNA or RNA. Categories: Genetics ...
- microdeletions
- amplifications
in disease conditions such as cancer and birth defects due to chromosome microdeletions. When normal cells are damaged or old they undergo apoptosis; cancer cells, however, avoid apoptosis. ...
A congenital disorder is a medical condition or defect that is present at or before birth (for example, congenital heart disease). ...
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