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A segment of a gene situated between exons that is removed before translation of messenger RNA and does not function in coding for protein synthesis.

[intr(agenic), occurring within a gene (intra- + genic) + -on.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(Genetics) biochem a stretch of DNA that interrupts a gene and does not contribute to the specification of a protein. Compare exon2
[C20: from intr(agenic) (regi)on]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˈɪn trɒn)

a noncoding segment in DNA that interrupts a gene-coding sequence or nontranslated sequence. Compare exon.
[1975–80; perhaps intr (o)- + -on1]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.intron - sequence of a eukaryotic gene's DNA that is not translated into a protein
deoxyribonucleic acid, desoxyribonucleic acid, DNA - (biochemistry) a long linear polymer found in the nucleus of a cell and formed from nucleotides and shaped like a double helix; associated with the transmission of genetic information; "DNA is the king of molecules"
coding DNA, exon - sequence of a gene's DNA that transcribes into protein structures; "exons are interspersed with introns"
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
References in periodicals archive ?
The Primer design included CYP27B1 gene exons and close introns (Table 1).
Leptin gene has three exons and two introns and located on chromosome 4 in cattle.
Finally, additional sequencing of two regions in introns 30 and 36 as well as MLPA analysis in 4 patients with one single mutation from both subgroups did not identify the second mutant allele.
As an initial step to investigate variations in OGT between European and Chinese pig breeds, attempts were made to amplify across several relatively short introns and a polymorphism was identified due to an inserted element in intron 20 of OGT [15].
In humans, TEs comprise 45% of the genome and are contained in introns of about 90% of human genes [11].
The 8 coding sequences, exon-intron boundaries, and part of introns were sequenced by Sanger sequencing in 4 products of PCR (polymerase chain reaction) amplification using 4 pairs of primers (Table 2).
Fifth, they primarily come from exons, while a few others come from introns or intron fragments.
The average Shannon entropy was calculated over each genomic feature (UTRs, exons, and introns) for each gene (Table 4) to better assess the average variability of specific genomic features and make comparisons between the different HLA genes.
Surprisingly, introns were often not removed from the RNA, which meant that no more functioning proteins could be generated.
Those watermarks were found in filler DNA, called introns, sandwiched between the parts of a gene containing the information used to make protein.
The primers were intended to amplify seven fragments corresponding to all the four exons (full coding regions) and three introns (partial noncoding regions) of [beta]2M gene in buffalo.