satellite DNA

(redirected from Dna, satellite)
Also found in: Dictionary.

sat·el·lite DNA

DNA in the satellite regions of acrocentric chromosomes.
Farlex Partner Medical Dictionary © Farlex 2012

satellite DNA

n.
A portion of DNA in eukaryotes whose density differs from that of the majority of DNA and that consists of short, repeating sequences of nucleotide pairs, often found near the region of the centromere.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.
Highly repetitive, non-transcribed DNA regions in eukaryotic chromosomes that have a different sedimentatin coefficient than other nuclear DNA. Satellite DNA contains many thousands to over 100,000 tandem—not inverted—repeats of a short basic motif or repeat unit—commonly 100 to 300 base pairs which occur at a few loci on the genome unit and differ from ‘main band’ DNA
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.

satellite DNA

tandemly repeated DNA, in which the DNA fragments involved form minor ‘satellite’ bands when genomic DNA (see GENOME).is fractionated by DENSITY-GRADIENT CENTRIFUGATION. Satellite bands of eucaryotic DNA fragments are composed of a long series (often hundreds of kb in length) of tandem repeats. There can be several different types of satellite DNA in a particular genome, with repeat units of 5 to 200bp. An example of satellite DNA is the alphoid DNA repeat in the CENTROMERE of eucaryotic CHROMOSOMES. Other types of tandemly repeated DNA are MINISATELLITES and MICROSATELLITES, although they do not appear in satellite bands on density gradients.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005