cistron

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cistron

 [sis´tron]
the smallest unit of genetic material that must be intact to function as a transmitter of genetic information; as traditionally construed, approximately synonymous with gene.

cis·tron

(sis'tron),
1. The smallest functional unit of heritability; a length of chromosomal DNA associated with a single biochemical function. Under classical concepts, a gene might consist of more than one cistron; in modern molecular biology, the cistron is essentially equivalent to the structural gene.
2. The genetic unit defined by the cis/trans test.
[cis tr-ans + -on]

cistron

(sĭs′trŏn′)
n.
A section of DNA that contains the genetic code for a single polypeptide and functions as a hereditary unit.

cis·tron′ic adj.

cis·tron

(sis'tron)
1. The smallest functional unit of heritability; a length of chromosomal DNA associated with a single biochemical function. In modern molecular biology, the cistron is essentially equivalent to the structural gene.
2. The genetic unit defined by the cis/trans test.
[cistr-ans + -on]

cistron

A short length of DNA that codes for a protein subunit (a polypeptide), together with adjacent sequences that control its expression. It is the smallest unit that transmits genetic information.

cistron

or

functional gene

a portion of DNA coding for one POLYPEPTIDE CHAIN or other gene product. The one gene/ one enzyme hypothesis thus becomes the ‘one cistron (gene)/one polypeptide’ hypothesis or ‘one gene/one functional product’ hypothesis.
References in periodicals archive ?
The 5S rDNA location was different from that of the population studied herein, because the 5S ribosomal cistrons were in a terminal position on the long arm of a subtelocentric pair.
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.
The Ribosomal RNA Cistrons. Chromosoma 85: 181-199.