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satellite DNA
PREFERRED TERM
satellite DNA
TYPE
Chemical
DEFINITION
Highly repetitive DNA sequences found in heterochromatin, mainly near centromeres. They are composed of simple sequences (very short) repeated in tandem many times to form large blocks of sequence. Additionally, following the accumulation of mutations, these blocks of repeats have been repeated in tandem themselves. The degree of repetition is on the order of 1000 to 10 million at each locus. Loci are few, usually one or two per chromosome. They were called satellites since in density gradients, they often sediment as distinct, satellite bands separate from the bulk of genomic DNA owing to a distinct base composition.
Secuencias altamente repetitivas de ADN que se encuentran en la heterocromatina, fundamentalmente están cerca de los centrómeros. Están compuestos por secuencias simples (muy cortas) repetidas de una en una y muchas veces para formar grandes bloques de secuencias. Adicionalmente, luego de la acumulación de mutaciones, estos bloques de repeticiones han sido repetidos ellos mismos en línea. El grado de repetición es del orden de 1000 a 10 millones en cada locus. Los locus son pocos, usualmente uno o dos por cromosoma. Se les llamó satélites ya que en gradientes de densidad, a menudo sedimentan como bandas satélite distintas separadas del grueso del ADN del genoma debido a su diferente composición de bases.
BROADER CONCEPT
DNA
repetitive sequences
NARROWER CONCEPTS
microsatellites
ALTERNATIVE LABEL
DNA, satellite
BELONGS TO GROUP
biochemistry
IN OTHER LANGUAGES
satelliet DNA
Dutch
DNA de satélite
Portuguese
ADN de satélite
Spanish
ADN satélite
URI
http://id.agrisemantics.org/gacs/C20256
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EXACT MATCH
http://id.cabi.org/cabt/104066
id.cabi.org
http://lod.nal.usda.gov/nalt/34245
lod.nal.usda.gov