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Related to Cistron: Polycistronic


(cell and molecular biology)
The genetic unit (deoxyribonucleic acid fragment) that codes for a particular polypeptide; mutants do not complement each other within a cistron. Also known as structural gene.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



a unit of genetic material responsible for a single function. The term “cistron” was introduced by the American geneticist S. Benzer in 1957 together with the terms “recon”—the smallest unit of deoxyribonucleic acid (DNA) capable of recombination—and “muton”—the smallest unit of DNA in which a change can result in a mutation. Benzer hypothesized correctly that all three units are sections of the nucleic acid molecule that differ from one another in length. In size the cistron is equal on the average to 1,200 nucleotides, with the number of nucleotides generally varying from 400 to 4,000. In modern genetics, a cistron is generally defined as the unit in nucleic acid that codes the structure of a single polypeptide. Consequently, the terms “cistron” and “gene” are synonymous.


Fiziologicheskaia genetika. Leningrad, 1976.
The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
For example the percentage of similarities between Gene and Cistron when n-gram and synonym are applied is 77% and this percentage increased to 84% and 88% (Figure 4) when data type and role of the attribute, respectively are considered.
In fact, what the word gene names as the cause of a phenotypic effect is not a single cistron at a single locus on a chromosome but rather the complex interaction of many cistrons: "the use of single-locus models is just a conceptual convenience" (21).
Este trabalho teve por objetivo isolar e identificar isolados de Guignardia oriundos de citros, mangueira, goiabeira, eucaliptos, jabuticabeira e pitangueira, bem como caracterizar a diversidade genetica existente atraves da analise da sequencia de DNA do cistron ITS1-5,8S-ITS2.
The peptide product of a 5' leader cistron in the [[beta].sub.2] adrenergic receptor mRNA inhibits receptor synthesis.
(ITS) of the nuclear rDNA cistron are important for understanding
The cryptomonad genome contains a short (4.9 kb) inverted repeat containing the rRNA cistrons, 30 tRNA genes, 44 genes encoding proteins for photosynthesis, 44 ribosomal protein genes (26 large subunit and 18 small subunit), 5 genes for biosynthetic function, 19 genes involved in gene expression (including 3 hypothetical chloroplast reading frames or ycfs), 25 additional ycfs, and 9 open reading frames (ORFs) larger than 50 amino acids.
Most widely used has been the nuclear ribosomal RNA cistron (rDNA), or portions thereof [ILLUSTRATION FOR FIGURE 1 OMITTED].
Regulatory elements in 5-UTRs may influence the translation of downstream cistrons (Barrett et al.
In eukaryotic cells, rRNA cistrons made up of 18S, 5.8S and 28S rRNA genes are transcribed by RNA polymerase I.
This pattern indicates that these chromosomal regions as poor cytotaxonomic markers, differing from other Atlantic fishes in which the identification of ribosomal cistrons has proved to be efficient to distinguish apparently homogeneous karyotypes, as in Lutjanidae [40], Serranidae [41], and Gerreidae [42] or even population units [43, 44].