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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Molecular cytogenetics ： ウィキペディア英語版 Molecular cytogenetics Molecular cytogenetics involves the combination of molecular biology and cytogenetics. In general this involves the use of a series of techniques referred to as fluorescence ''in situ'' hybridization, or FISH, in which DNA probes are labeled with different colored fluorescent tags to visualize one or more specific regions of the genome. FISH can either be performed as a direct approach to metaphase chromosomes or interphase nuclei. Alternatively, an indirect approach can be taken in which the entire genome can be assessed for copy number changes using virtual karyotyping. Virtual karyotypes are generated from arrays made of thousands to millions of probes, and computational tools are used to recreate the genome ''in silico''. ==Studies of meiosis== In eukaryotes, the Rad51 and Dmc1 proteins have a central role in meiosis. Teresawa et al.〔Terasawa M, Shinohara A, Hotta Y, Ogawa H, Ogawa T. Localization of RecA-like recombination proteins on chromosomes of the lily at various meiotic stages. Genes Dev. 1995 Apr 15;9(8):925-34. PMID 7774810〕 using immunofluorescence microscopy found that in Lilium longiflorum, Rad51 and Lim15 (an ortholog of Dmc1) co-localize on meiotic prophase I chromosomes where they form discrete foci. Using electron microscopic immunogold labeling localization, Anderson et al.〔Anderson LK, Offenberg HH, Verkuijlen WM, Heyting C. RecA-like proteins are components of early meiotic nodules in lily. Proc Natl Acad Sci U S A. 1997 Jun 24;94(13):6868-73. PMID 11038554〕 found Rad51 and/or Lim15 proteins to be components of early meiotic nodules that are involved in recombination related events. The stages of meiosis in which the co-localization of the Rad51 and Lim15 proteins occurs are the leptotene and zygotene stages of meiosis, suggesting that meiotic recombination begins at the leptotene stage with the cooperation of these proteins and continues into zygotene.〔 These proteins catalyze pairing of homologous chromosomes, DNA strand exchange, and recombinational repair of DNA damages.〔Harris Bernstein, Carol Bernstein and Richard E. Michod (2011). Meiosis as an Evolutionary Adaptation for DNA Repair. Chapter 19 pages 357-382 in "DNA Repair" (Inna Kruman editor). InTech Open Publisher. ISBN 978-953-307-697-3 http://www.intechopen.com/books/dna-repair/meiosis-as-an-evolutionary-adaptation-for-dna-repair〕 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「Molecular cytogenetics」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.