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.

    Compare with exon

    ‘First, many heterochromatic genes have large introns relative to the genome as a whole.’
    • ‘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.