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A ‘tandem repeat’ in DNA is a sequence of two or more contiguous, approximate copies of a pattern of nucleotides. Tandem repeats are common in the genomes of both eukaryotic and prokaryotic organisms. They are significant markers for human identity testing, disease diagnosis, sequence homology and population studies. In this article, we describe a new database, TRedD, which contains the tandem repeats found in the human genome. The database is publicly available online, and the software for locating the repeats is also freely available. The definition of tandem repeats used by TRedD is a new and innovative definition based upon the concept of ‘evolutive tandem repeats’. In addition, we have developed a tool, called TandemGraph, to graphically depict the repeats occurring in a sequence. This tool can be coupled with any repeat finding software, and it should greatly facilitate analysis of results.

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This article originally appeared in Database, The Journal of Biological Databases and Curation, available at DOI: 10.1093/database/baq003

©The Author(s) 2010. This is Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://, which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.



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