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Array Analysis: The Basics


Gene arrays are solid supports upon which a collection of gene-specific nucleic acids have been placed at defined locations, either by spotting or direct synthesis. In array analysis, a nucleic acid-containing sample is labeled and then allowed to hybridize with the gene-specific targets on the array. (In the literature, the term "target" can refer to either the nucleic acids attached to the array or the labeled nucleic acid of the sample. In this article, the nucleic acids attached to arrays are called "targets," whereas the labeled nucleic acids comprising the sample are called "probes.") Based on the amount of probe hybridized to each target spot, information is gained about the specific nucleic acid composition of the sample. The major advantage of gene arrays is that they can provide information on thousands of targets in a single experiment.

Currently the solid supports upon which nucleic acids are arrayed are either glass slides or nylon membranes. Typically, fluorescently labeled probes are used with glass arrays, while radiolabeled probes are used with membranes. Depending on the type of array, the arrayed nucleic acids may be composed of oligonucleotides, PCR products or cDNA vectors or purified inserts. The sequences may represent entire genomes and may include both known and unknown sequences or may be collections of sequences such as apoptosis-related genes or cytokines. Many pre-made and custom arrays are
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