intron

intron
A portion of DNA that lies between two exons, is transcribed into RNA, but does not appear in that mRNA after maturation because the i. 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 prior to maturation. SYN: intervening sequence. [inter- + -on]

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in·tron 'in-.trän n a polynucleotide sequence in a nucleic acid that does not code information for protein synthesis and is removed before translation of messenger RNA compare EXON
in·tron·ic in-'trän-ik adj

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in·tron (inґtron) [intervening (sequence) + -on] in eukaryotic genes, a noncoding DNA sequence separating two coding sequences (exons); it is initially transcribed into heterogeneous nuclear RNA (hnRNA) as part of the primary transcript, but is spliced out in the generation of mature messenger RNA (mRNA), prior to translation. By extension, the term also denotes the same sequences in the primary RNA transcript. Called also intervening sequence.

Medical dictionary. 2011.

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  • intron — [ ɛ̃trɔ̃ ] n. m. • 1979; de intr(o) et on, par l angl. ♦ Biochim. Séquence d A. D. N. non codante, intervenant entre deux exons d un gène. Le gène de la globine comprend trois exons et deux introns. ● intron nom masculin Fraction d A.D.N.… …   Encyclopédie Universelle

  • intron — intron. См. интрон. (Источник: «Англо русский толковый словарь генетических терминов». Арефьев В.А., Лисовенко Л.А., Москва: Изд во ВНИРО, 1995 г.) …   Молекулярная биология и генетика. Толковый словарь.

  • intrón — (en genética molecular) secuencia de pares de bases del ADN que interrumpe la continuidad de la formación genética. Diccionario Mosby Medicina, Enfermería y Ciencias de la Salud, Ediciones Hancourt, S.A. 1999 …   Diccionario médico

  • Intron — Intron, nichtinformativer (nichtcodierender) Abschnitt in einem eukaryotischen Gen. I. werden transkribiert und nach der Transkription, beim Processing, durch einen Enzymkomplex aus der hnRNA herausgeschnitten. Die DNA Abschnitte, die… …   Deutsch wörterbuch der biologie

  • intron — 1978, from intragenic + ON (Cf. on) …   Etymology dictionary

  • intron — [in′trän΄] n. [coined (1978) by W. Gilbert (1932 ), U.S. molecular biologist < INTRA (because within the gene) + on, as in OPERON] an intervening sequence in the eukaryote genetic code, interrupting protein formation …   English World dictionary

  • Intron — Introns, derived from the term intragenic regions and also called intervening sequence (IVS) [Cite web url = http://www.biochem.northwestern.edu/holmgren/Glossary/Definitions/Def I/intron.html title = intron (intervening sequence) author = Mark… …   Wikipedia

  • Intron — schematischer Aufbau eines Gens Introns (englisch Intervening regions) sind die nicht codierenden Abschnitte der DNA innerhalb eines Gens (intragen), die benachbarte Exons trennen. Introns werden transkribiert, aber dann aus der prä mRNA …   Deutsch Wikipedia

  • Intron — Représentation schématique de l enchaînement exon intron dans un gène du génome, ici représenté par un chromosome. Un intron est une portion de gène non codante. Chez les organismes eucaryotes, les gènes qui codent les protéines sont constitués d …   Wikipédia en Français

  • Intrón — Un intrón es una región del ADN que debe ser eliminada del transcrito primario de ARN, a diferencia de los exones que son regiones que codifican para una determinada proteína. Los intrones son comunes en todos los tipos de ARN eucariota,… …   Wikipedia Español

  • Intrón — Un intrón es cada uno de los fragmentos de ADN en la codificación de un gen, que no son capaces de expresarse bajo la forma de una proteína. ● Es una secuencia no codificadora de ADN que separa a dos exones. El intrón inicialmente se transcribe… …   Enciclopedia Universal

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