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A nucleotide sequence that is found in a gene, codes information for protein synthesis, and is transcribed to messenger RNA.

[ex(pressed) + -on.]

ex·on′ic adj.


(Historical Terms) Brit one of the four officers who command the Yeomen of the Guard
[C17: a pronunciation spelling of French exempt exempt]


(Genetics) any segment of a discontinuous gene the segments of which are separated by introns. Compare intron
[C20: from ex-1 + -on]
exˈonic adj


(ˈɛk sɒn)

a segment of DNA that is transcribed to RNA and specifies the sequence of a portion of protein.
[1975–80; ex(pressed sequence) + -on1]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.exon - sequence of a gene's DNA that transcribes into protein structures; "exons are interspersed with introns"
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"
intron, noncoding DNA - sequence of a eukaryotic gene's DNA that is not translated into a protein
References in periodicals archive ?
Primers for exons (2, 3) were designed from intron exon boundaries of approximately 100bp sequence of c-Myc gene by primer 3 and Net primer software (Table I) and manufactured by Advance Bioscience International.
NASDAQ: WVE) has initiated a global Phase 1 clinical trial for WVE-210201 in Duchenne muscular dystrophy (DMD) patients amenable to exon 51 skipping, the company said.
Sarepta will also make certain additional regulatory and commercial milestone payments for exons 51, 45, 53 and probably on other exon-skipping products to be developed in the future.
Mutation screening of all exons and exon-intron boundaries was performed by Sanger sequencing, and mini haplotype analysis was carried out by genotyping of Short Tandem Repeat (STR) and Variable Number Tandem Repeat (VNTR) alleles.
Williamson et al suggested that PCR-based screening analysis of exon 3 and exon 4 is the first step for genetic diagnosis of RTT because of the majority of mutations are seen in these regions.
The BDNF gene has a complicated structure with eight 5' noncoding exons (I-IXa), each of which can splice to a common coding exon (IX) to form a functional transcript.
For amplification of FASN gene (exon 38, 39, 40, 41 and exon 42) in Murrah buffalo the primers were designed from published cattle (Bos taurus) sequences available online in the Gen bank (www.
The researchers also found small exon snippets (micro exons) in fully developed cells.
Among the original group of 54 patients, 10 tumors exhibited a mutation called MET exon 14 skipping.
With the cobas EGFR Mutation Test v2, the presence of specific NSCLC mutations (exon 19 deletion or exon 21 [L858R] substitution mutations) detected in patients' blood samples aids in selecting those patients who may benefit from treatment with Tarceva.
fragment I (206 bp: full exon 1), fragment II (296 bp: partial intron 1), fragment III (287 bp: full exon 2), fragment IV (227 bp: partial intron 2 and full exon 3), fragment V (226 bp: partial intron 3), fragment VI (201 bp: initial partial exon 4) and fragment VII (405 bp: remaining partial exon 4) of [[beta].
Sequencing of the full-length PCR product confirmed its expected composition (exons 1921), while the smaller PCR product contained only exon 21.