(= intervening sequence) A non-coding sequence of DNA within a gene (cf. exon), that is transcribed into hnRNA but is then removed by RNA splicing in the nucleus, leaving a mature mRNA that is then translated in the cytoplasm. Introns are poorly conserved and of variable length, but the regions at the ends are self-complementary, allowing a hairpin structure to form naturally in the hnRNA; this is the cue for removal by RNA splicing. Introns are thought to play an important role in allowing rapid evolution of proteins by exon shuffling. Genes may contain as many as 80 introns.
A eucaryotic DNA segment that does not code for protein but may interrupt segments which do encode protein. Contrast with Exons, the coding sequences.
A noncoding DNA sequence within a gene that is initially transcribed into messenger RNA but is later snipped out. See Coding, DNA, Messenger RNA, Transcription.Found on http://www.encyclo.co.uk/local/20095
- sequence of a eukaryotic gene`s DNA that is not translated into a proteinFound on http://www.webdictionary.co.uk/definition.php?query=intron
Non-coding sequence within gene
s which separates the exons (coding regions). Note: Introns are spliced out of the messenger RNA molecule created from a gene
after tr...Found on http://sis.nlm.nih.gov/enviro/iupacglossary/glossaryi.html
Intron: Part of a gene that is initially transcribed into the primary RNA transcript but then removed from it when the exon sequences on either side of it are spliced together. Also called an intervening sequence.Found on http://www.medterms.com/script/main/art.asp?articlekey=4026
<molecular biology> A noncoding sequence of DNA within a gene, that is transcribed into hnRNA but is then cut out of the message by RNA splicing in the nucleus, leaving a mature mRNA that is then translated in the cytoplasm. ... Introns are poorly conserved and of variable length, but the regions at the ends are self complementary, allowing a...Found on http://www.encyclo.co.uk/local/20973
(from the article `heredity`) ...is called a poly(A) tail, which is characteristic of all eukaryotic DNA. At the 5 end of the mRNA, a modified guanine nucleotide, called a cap, is ... ...revealed that portions of newly synthesized RNA molecules are cut out and discarded. In many genes, the regions coding for proteins are ... ...artic...Found on http://www.britannica.com/eb/a-z/i/35
intron 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.Found on http://www.wordinfo.info/words/index/info/view_unit/2190/2
A segment of DNA that does not code for protein; the intervening sequence of nucleotides between coding sequences or exons.
Found on http://www.encyclo.co.uk/local/21016
DNA sequence that interrupts the protein-coding sequence of a gene; an intron is transcribed into RNA but is cut out of the message before it is translated into protein.Found on http://www.ornl.gov/sci/techresources/Human_Genome/glossary/glossary.shtml
A portion of messenger RNA (mRNA), as transcribed from the DNA of a eukaryote, which is removed by enzymes before the mRNA matures and is transplanted into protein. The portions of mRNA that remain after the excision of the introns are known as exons.Found on http://www.daviddarling.info/encyclopedia/I/intron.html
Type: Term Pronunciation: in′tron Definitions: 1. 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 corr...Found on http://www.medilexicon.com/medicaldictionary.php?t=45431
An intron is any nucleotide sequence within a gene that is removed by RNA splicing while the final mature RNA product of a gene is being generated. The term intron refers to both the DNA sequence within a gene and the corresponding sequence in RNA transcripts. Sequences that are joined together in the final mature RNA after RNA splicing are exons....Found on http://en.wikipedia.org/wiki/Intron
In eukaryotes, bases of a gene transcribed but later excised from the mRNA prior to exporting from t
Found on http://www.superglossary.com/Glossary/Science/Biology/
DNA whose nucleotide sequence does not code for a product. An intron isFound on http://www.cattlepages.com/dictionary/
The unneeded DNA that is does not code for anything; Filler DNA, Junk DNA or nonsense DNA; Long regions of DNA with no apparent function that separate the exons. See Exons. Found on http://www.cat-world.com.au/glossary
The nucleotide sequences of some genes consist of parts that code for amino acids, and other parts that do not code for amino acids interspersed among them. The interspersed non-coding parts, which are not translated, are called introns; the coding parts are called exons.Found on http://www.fossilmall.com/Science/Glossary.htm
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