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Related to cistron: Polycistronic


A section of DNA that contains the genetic code for a single polypeptide and functions as a hereditary unit.

[From cis-trans test, a genetic test (cis- + trans-) + -on.]

cis·tron′ic adj.


(Genetics) genetics the section of a chromosome that encodes a single polypeptide chain
[C20: from cis-trans; see cis-trans test]


(ˈsɪs trɒn)

a segment of DNA that codes for the formation of a specific protein; a structural gene.
[1955–60; cis- + tr (ans)- + -on1]
cis•tron′ic, adj.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.cistron - (genetics) a segment of DNA that is involved in producing a polypeptide chaincistron - (genetics) a segment of DNA that is involved in producing a polypeptide chain; it can include regions preceding and following the coding DNA as well as introns between the exons; it is considered a unit of heredity; "genes were formerly called factors"
dominant gene - gene that produces the same phenotype in the organism whether or not its allele identical; "the dominant gene for brown eyes"
allele, allelomorph - (genetics) either of a pair (or series) of alternative forms of a gene that can occupy the same locus on a particular chromosome and that control the same character; "some alleles are dominant over others"
genetic marker - a specific gene that produces a recognizable trait and can be used in family or population studies
homeotic gene - one the genes that are involved in embryologic development
lethal gene - any gene that has an effect that causes the death of the organism at any stage of life
linkage group, linked genes - any pair of genes that tend to be transmitted together; "the genes of Drosophila fall into four linkage groups"
modifier gene, modifier - a gene that modifies the effect produced by another gene
mutant gene - a gene that has changed so that the normal transmission and expression of a trait is affected
nonallele - genes that are not competitors at the same locus
operator gene - a gene that activates the production of messenger RNA by adjacent structural genes
oncogene, transforming gene - a gene that disposes normal cells to change into cancerous tumor cells
polygene - a gene that by itself has little effect on the phenotype but which can act together with others to produce observable variations
proto-oncogene - a normal gene that has the potential to become an oncogene
recessive gene - gene that produces its characteristic phenotype only when its allele is identical; "the recessive gene for blue eyes"
regulator gene, regulatory gene - a gene that produces a repressor substance that inhibits an operator gene
repressor gene - gene that prevents a nonallele from being transcribed
structural gene - a gene that controls the production of a specific protein or peptide
suppresser gene, suppressor gene, suppresser, suppressor - a gene that suppresses the phenotypic expression of another gene (especially of a mutant gene)
transgene - an exogenous gene introduced into the genome of another organism
X-linked gene - a gene located on an X chromosome
holandric gene, Y-linked gene - a gene located on a Y chromosome
chromosome - a threadlike strand of DNA in the cell nucleus that carries the genes in a linear order; "humans have 22 chromosome pairs plus two sex chromosomes"
genetic science, genetics - the branch of biology that studies heredity and variation in organisms
molecular biology - the branch of biology that studies the structure and activity of macromolecules essential to life (and especially with their genetic role)
sequence - serial arrangement in which things follow in logical order or a recurrent pattern; "the sequence of names was alphabetical"; "he invented a technique to determine the sequence of base pairs in DNA"
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"
References in periodicals archive ?
Next, 1 [micro]L of the extracted DNA was used in PCR with primers Dino1662F and 28SR2 to amplify a ~1 900 base pair region of the rRNA gene cistron covering 3' end region of the SSU, the entire ITS, and partial 5' region of the LSU (3'end-SSU-ITS1-5.
Polymerase chain reaction (PCR) was initially used to amplify part of the mitochondrial cytochrome oxidase c subunit 1 gene (COI) and the complete internal transcribed spacer 2 gene (ITS2) of the nuclear ribosomal cistron (rRNA).
8S-ITS2 region of the rDNA cistron (977bp) were obtained for 16 samples of nematodes.
The ITS region of ribosomal DNA (rDNA) cistron has been primarily sequenced in fungi for the use of diversity documentation intra- and interspecies level classification phylogenetic analyses and environmental sampling; because of their high degree of variation than the 5S 5.
Variation in the ribosomal RNA cistron among host-adapted races of ah aphid (Schizaphis graminum).
Thus, the fact that silver impregnation revealed only one active NOR in Cytotype C2 (Figure ld) with the certainty that another rDNA cistron is present in the element of the pair No 1 that probably arose by pericentric inversion, lead to suggest that this NOR cluster could be inactivated after inversion by the loss of sequences involved with the transcriptional control of these genes, thus impeding the activity of those genes during the previous interphase, explaining the presence of a hybridization signal with the probe 18S rDNA on the tip of this chromosome, although without expression as demon strated by silver nitrate.
The structural genes encoding A and B subunits, ctxA and ctxB, are arranged so that the ctxA cistron precedes ctxB (13).
Organism (Organism, OrgName, CHRO, DBReference, Description) Cistron (CistronID, C_Name, Organism, Symbol)