Biologically Active Substance
intron Audio
in·tron [ in-tron ]
Subclass of:
Gene Components; DNA, Intergenic
Definitions related to introns:
  • Noncoding intervening sequence in a gene; separates the coding sequences.
    CRISP Thesaurus
    National Institutes of Health, 2006
  • Non-coding, intervening sequences of DNA that are transcribed, but are removed from within the primary gene transcript and rapidly degraded during maturation of messenger RNA.
    NCI Thesaurus
    U.S. National Cancer Institute, 2021
  • The sequence of DNA in between exons that is initially copied into RNA but is cut out of the final RNA transcript and therefore does not change the amino acid code. Some intronic sequences are known to affect gene expression.
    NCI Dictionary of Cancer Terms
    U.S. National Cancer Institute, 2021
  • Sequences of DNA in the genes that are located between the EXONS. They are transcribed along with the exons but are removed from the primary gene transcript by RNA SPLICING to leave mature RNA. Some introns code for separate genes.
    NLM Medical Subject Headings
    U.S. National Library of Medicine, 2021
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This content should not be used in place of medically-reviewed decision support reference material or professional medical advice. Some terms may have alternate or updated definitions not reflected in this set. The definitions on this page should not be considered complete or up to date.