Also called intervening sequences. A region in the DNA base sequence of eukaryotes that does not specify the amino acid sequence of a protein. Many structural genes of eukaryotes have several to a dozen introns in between, which divide the region that specifies the amino acid sequence (called exon) into several parts. A structural gene containing introns is transcribed as is to become a precursor messenger RNA (mRNA), and then in a process called splicing, the introns are cut off and only the exons are connected to form the completed mRNA. → Related topics Genes | Ribozymes Source : Heibonsha Encyclopedia About MyPedia Information |
介在配列とも。真核生物のDNA塩基配列のうち,タンパク質のアミノ酸配列を指定していない領域。真核生物の構造遺伝子の多くは,数個から十数個のイントロンを介在させており,それらによってアミノ酸配列を指定する領域(エクソンと呼ばれる)はいくつかに分断される。イントロンを含む構造遺伝子は,そのまま転写されて前駆体メッセンジャーRNA(mRNA)となったのち,スプライシングと呼ばれる過程でイントロンが切り落とされ,エクソンだけがつながって完成型mRNAとなる。 →関連項目遺伝子|リボザイム 出典 株式会社平凡社百科事典マイペディアについて 情報 |
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