intron

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Related to Introns: Exons

in·tron

(in'tron),
A portion of DNA that lies between two exons, is transcribed into RNA, but does not appear in that mRNA after maturation because the intron is removed and the exons spliced together, and so is not expressed (as protein) in protein synthesis. By customary usage, the term is extended to the corresponding regions in the primary transcript of mRNA before maturation.
[inter- + -on]

intron

/in·tron/ (in´tron) a noncoding sequence between two coding sequences within a gene, processed out in the formation of mature mRNA.

intron

(ĭn′trŏn)
n.
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.

intron

[in′tron]
Etymology: L, intra, within, regin, region
a sequence of nucleotides in eukaryotic DNA that does not code for amino acids and interrupts the coding sequence of a gene. Some genes contain numerous long introns. Compare exon.

in·tron

(in'tron)
A portion of DNA that lies between two exons, is transcribed into RNA, but does not appear in that RNA after maturation, and so is not expressed (as protein) in protein synthesis.

intron

A non-coding segment of a DISCONTINUOUS GENE. Introns are lengths of DNA interposed between coding segments (EXONS) in a gene and are transcribed into MESSENGER RNA but are then removed from the transcript and the exons spliced together. Introns do not contain biological information.

intron

or (‘in’ for intervening) - an intervening nucleotide sequence in an INTERRUPTED split gene. Such sequences are transcribed into primary RNA transcripts, but then excised from the RNA, leaving behind the EXON sequences for the functional gene product. See RNA PROCESSING, RNA SPLICING.

intron

untranslated, intervening sequences that are interspersed between coding sequences of a particular gene of almost all eukaryocytic genes and which are excised from the primary RNA transcript to yield mRNA.

intron-exon junction
introns are removed by the catalytic action of small nuclear riboproteins (snRNPs) which bind to special recognition sequences at the 5,(donor junction) and 3,(receptor junction) to form a complex called a spliceosome.
References in periodicals archive ?
To test for promoter activity, the 5'-flanking region containing promoter with and without intron 1 was fused to the firefly luciferase gene in pGV-B2 (TOYO INK MFG, Japan) as follows.
Characterization of nine taxa with details on exons length, introns length, total gene length, exon-intron ratios, exon and intron numbers, and length of coding and non-coding regions Taxa/Length (bp) E-1 I-1 E-2 I-2 E-3 H.
Determination of CpG islands in the introns of CD36 genes was conducted using the website http://www.
In one approach, primers that are reported to amplify introns in a wide range of species were taken from the literature, and were tested on clam DNA (Palumbi 1996, Jarman et al.
17) Furthermore, group II introns are mobile genetic elements that can transpose from one location within a genome to another and require an intron-encoded reverse transcriptase/ maturase protein for transposition and proper splicing.
What advantage might such enzymes give introns and inteins?
Walter and colleagues spied on the splicing process by attaching fluorescent tags to exons on either side of an intron in a short section of RNA they designed specifically for such studies.
ecNOS POLYMORPHISMS IN HUMAN UMBILICAL CORDS In the case of the intron 4 VNTR, 9 of 43 individuals had the 4a/4b genotype, and the others had the 4b/4b genotype.
Because the typical cell size of an animal tends to match the length of its genome, the development of shorter introns could account for the relatively small size of bird cells.
Intrexon's Chief Science Officer, the new name also aligns well with the company's UltraVector(TM) tool-making system, which enables dynamic assembly and exchange of genetic modules: "We produce transgenes composed of interchangeable genetic modules, including specialized genetic units encoded with natural introns and exons.
Sequencing results using intron primers were evaluated for resolution of ambiguities and genotyping accuracy.
Gilbert argued that introns facilitated this "shuffling" of exons.