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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 Spacer DNA ： ウィキペディア英語版 Spacer DNA Spacer DNA or intergenic spacer (IGS) is a region of non-coding DNA between genes. The term is used particularly for the spacer DNA between the many tandemly repeated copies of the ribosomal RNA genes. In bacteria, spacer DNA sequences are only a few nucleotides long. In eukaryotes, they can be extensive and include repetitive DNA, comprising the majority of the DNA of the genome.〔 In ribosomal DNA, there are spacers within and between gene clusters, called internal transcribed spacer (ITS) and external transcribed spacers (ETS), respectively. In animal, the mitochondrial DNA genes generally have very short spacers. In fungi, mitochondrial DNA spacers are common and variable in length, and they may also be mobile.〔 Since spacer DNA sequence changes much more rapidly in evolution than the gene sequence, it is thought that spacer DNA does not have a function that depends on its sequence, although it may have sequence-independent function.〔 ==References== 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「Spacer DNA」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.