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Repeated sequence (DNA)

Repeated sequences (aka. repetitive elements, or repeats) are patterns of nucleic acids (DNA or RNA) that occur in multiple copies throughout the genome. The functions and descriptions of these sequences are currently being characterized by scientists. Repetitive DNA was first detected because of its rapid reassociation kinetics.


Main types

There are 3 major categories of repeated sequence or repeats:

In primates, the majority of LINEs are LINE-1 and the majority of SINEs are Alu's. SVAs are hominoid specific.

In prokaryotes, CRISPR are arrays of alternating repeats and spacers.

Other types

Note: The following are covered in detail in "Computing for Comparative Microbial Genomics".[1]

  • Direct repeats
    • Global direct repeat
    • Local direct simple repeats
    • Local direct repeats
    • Local direct repeats with spacer
  • Inverted repeats
    • Global inverted repeat
    • Local inverted repeat
    • Inverted repeat with spacer
    • Palindromic repeat
  • Mirror and everted repeats

See also


  1. ^ Ussery, David W.; Wassenaar, Trudy; Borini, Stefano (2008-12-22). "Word Frequencies, Repeats, and Repeat-related Structures in Bacterial Genomes". Computing for Comparative Microbial Genomics: Bioinformatics for Microbiologists. Computational Biology 8 (1 ed.). Springer. pp. 133–144. ISBN 978-1-84800-254-8. 

External links

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