Reference Entry

satellite DNA

Edited by Michael Allaby

in A Dictionary of Plant Sciences

Fourth edition

Published in print March 2019 | ISBN: 9780198833338
Published online March 2019 | e-ISBN: 9780191871665
satellite DNA

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Any *DNA which differs enough in its base composition to form a separate fraction from the majority of genomic DNA on centrifugation. This bias in base composition is often due to highly repetitious DNA. Satellite DNA may consist of dispersed repeats (e.g. long interdispersed elements and short interdispersed elements) or may be arranged in a tandem array. In a tandem array it may have very short repeating units, 2–10 base pairs in the case of microsatellite DNA (variable-number tandem repeat), or slightly longer ones, 10–100 base pairs in the case of minisatellite DNA. The number of repeating units within a single satellite tandem array changes rapidly in evolutionary terms, due to the processes of replication slippage and ...

Reference Entry.  177 words. 

Subjects: Plant Sciences and Forestry ; Plant Physiology

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