extrachromosomal element

(redirected from extrachromosomal elements)


A genetic particle physically separate from the chromosome of the host cell (chiefly bacterial) that can function and replicate stably and usually confer some advantage to the host cell; not essential to the cell's basic functioning.
[cytoplasm + -id]
Farlex Partner Medical Dictionary © Farlex 2012

ex·tra·chro·mo·so·mal element

See plasmid.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.


A genetic particle physically separate from the chromosome of the host cell (chiefly bacterial) that can stably function and replicate; not essential to the basic functioning of the cell.
Synonym(s): extrachromosomal element, extrachromosomal genetic element.
[cytoplasm + -id]
Medical Dictionary for the Health Professions and Nursing © Farlex 2012
References in periodicals archive ?
The genome of VR-MSSA has a 2,906,602-bp chromosome and 3 extrachromosomal elements, including a plasmid of 55,713 bp identical to the previously described vanA--carrying pBRZ01 (1), which also harbors aac(6')-aph(2"), which confers gentamicin resistance.
Most Bt isolates have several extrachromosomal elements, some of them circular and others linear (Carlson et al., 1994).
After an overview of the role of sex chromosomes in evolution and human diseases, research chapters cover topics such as the role of extrachromosomal elements in human leukemia cells, and alternative splicing transcripts affected by junction tandem repeats in the human genome.
The genome was found to consist of three separate DNA molecules: one large circular chromosome (1.66 Mb) and two extrachromosomal elements (about 58,400 bp and 16,550 bp).
Additionally, the groups of isolates as a whole from each sample displayed remarkable similarities in the sizes of extrachromosomal elements, adhesion to crude oil, and hydrocarbon substrate utilization.
All of the strains tested, except Pseudomonas aeruginosa CRFY1, contained the smaller of the two size classes of extrachromosomal elements present.
burgdorferi, whose genome is composed of an [approximately equal to] 1 Mbp (million base pairs) linear chromosome and 21 linear and circular extrachromosomal elements.

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