exon

Japanese: exon
exon

...Such DNA segments within the structural gene that are not involved in translation are called introns or intervening sequences. In contrast, DNA segments that are involved in translation are called exons. Eukaryotic structural genes are usually mosaic arrangements of multiple exons and introns, and their internal structure differs from that of prokaryotic genes, which do not contain introns.

From [DNA]

… In contrast, in the transcription of eukaryotic DNA, one mRNA is usually synthesized for each gene. In addition, a base sequence (called an intron) is inserted between the base sequences (called exons) that correspond to the amino acid sequence of a protein. The introns are copied into the mRNA along with the exons, but are then cut off when the mRNA matures. …

*Some terminology explanations that mention "exon" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…構造遺伝子の領域内にあって翻訳に関与しないこのようなDNA部分をイントロンintronまたは介在配列とよぶ。これに対し,翻訳にあずかるDNA部分をエクソンexonという。真核生物の構造遺伝子はふつう複数のエクソンとイントロンがモザイク状に配列したものであり,イントロンを包含しない原核生物の遺伝子とは内部構造が異なっている。…

【DNA】より

… これに対し真核生物DNAの転写では,ふつう一つの遺伝子に対して1本のmRNAが合成される。また,一つのタンパク質のアミノ酸配列に対応する塩基配列(エクソンexonと呼ばれる)の間に別の塩基配列(イントロンintronと呼ばれる)が挿入されている。イントロンはエクソンとともにmRNAに写されるが,その後,mRNAが熟成するときに切り捨てられる。…

※「exon」について言及している用語解説の一部を掲載しています。

出典|株式会社平凡社世界大百科事典 第2版について | 情報

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