Direct repeat

Direct repeats are a type of genetic sequence that consists of two or more repeats of a specific sequence.^[1] In other words, the direct repeats are nucleotide sequences present in multiple copies in the genome. Generally, a direct repeat occurs when a sequence is repeated with the same pattern downstream.^[1] There is no inversion^{[clarification needed]} and no reverse complement associated with a direct repeat. It may or may not have intervening nucleotides. The nucleotide sequence written in bold characters signifies the repeated sequence.

5´ TTACGnnnnnnTTACG 3´

3´ AATGCnnnnnnAATGC 5´

Linguistically, a typical direct repeat is comparable to saying "bye-bye".^[1]

^ ^a ^b ^c Ussery, David W.; Wassenaar, Trudy; Borini, Stefano (2009). "Word Frequencies and Repeats §Word Frequencies, Repeats, and Repeat-related Structures in Bacterial Genomes". Computing for Comparative Microbial Genomics: Bioinformatics for Microbiologists. Computational Biology. Vol. 8 (1 ed.). Springer. pp. 133–144. doi:10.1007/978-1-84800-255-5_8. ISBN 978-1-84800-254-8.

[Ussery2008-1] Ussery, David W.; Wassenaar, Trudy; Borini, Stefano (2009). "Word Frequencies and Repeats §Word Frequencies, Repeats, and Repeat-related Structures in Bacterial Genomes". Computing for Comparative Microbial Genomics: Bioinformatics for Microbiologists. Computational Biology. Vol. 8 (1 ed.). Springer. pp. 133–144. doi:10.1007/978-1-84800-255-5_8. ISBN 978-1-84800-254-8.

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