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Gene trapping is a high-throughput approach that is used to introduce insertional mutations across the mammalian genome. It is performed with gene trap vectors whose principal element is a gene trapping cassette consisting of a promoterless reporter gene and/or selectable genetic marker flanked by an upstream 3’ splice site (splice acceptor; SA) and a downstream transcriptional termination sequence (polyadenylation sequence; polyA). When inserted into an intron of an expressed gene, the gene trap cassette is transcribed from the endogenous promoter of that gene in the form of a fusion transcript in which the exon(s) upstream of the insertion site is spliced in frame to the reporter/selectable marker gene. Since transcription is terminated prematurely at the inserted polyadenylation site, the processed fusion transcript encodes a truncated and non-functional version of the cellular protein and the reporter/selectable marker. Thus, gene traps simultaneously inactivate and report the expression of the trapped gene at the insertion site, and provide a DNA tag (gene trap sequence tag, GTST) for the rapid identification of the disrupted gene. An international public consortium (International Gene Trap Consortium ) is centralizing the data and cell lines can be requested from them. ==See also== *Enhancer trap *gene targeting *Mouse models of breast cancer metastasis 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「gene trapping」の詳細全文を読む スポンサード リンク
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