Meaning of intron in English:


Pronunciation /ˈɪntrɒn/


  • A segment of a DNA or RNA molecule which does not code for proteins and interrupts the sequence of genes.

    ‘First, many heterochromatic genes have large introns relative to the genome as a whole.’
    Compare with exon
    • ‘The coding region is interrupted by several synthetic introns to improve gene expression.’
    • ‘This finding is the first suggestion that multiple spliceosomal introns occur in ribosomal genes.’
    • ‘The second insertion traps an exon of a different gene contained in an intron of the former gene.’
    • ‘This exception may be the result of this region corresponding to a small intron in the Drosophila gene.’


1970s from intra-‘within’ + -on.