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intron Line breaks: in¦tron
Pronunciation: /ˈɪntrɒn/

Definition of intron in English:


A segment of a DNA or RNA molecule which does not code for proteins and interrupts the sequence of genes. Compare with exon1.
Example sentences
  • 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.


Example sentences
  • The upper band is amplified genomic DNA containing the intronic sequence.
  • Even though there was a certain amount of intra-allelic variation in intronic and third codon positions, an allele-specific DNA consensus sequence could be easily deduced.
  • In the GART locus, however, simultaneous transcription of the purine gene and the intronic gene seems possible.


1970s: from intra- 'within' + -on.

Definition of intron in:
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