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| Title | Storage and Retrieval of Individual Genomes |
| Authors | Veli Mäkinen, Gonzalo Navarro, Jouni Sirén, Niko Välimäki |
| Publication date | 2009 |
| Abstract | A repetitive sequence collection is one where portions of a \emph{base sequence} of length $n$ are repeated many times with small variations, forming a collection of total length $N$. Examples of such collections are version control data and genome sequences of individuals, where the differences can be expressed by lists of basic edit operations. Flexible and efficient data analysis on a such typically huge collection is plausible using suffix trees. However, suffix tree occupies $O(N \log N)$ bits, which very soon inhibits in-memory analyses. Recent advances in full-text \emph{self-indexing} reduce the space of suffix tree to $O(N \log \sigma)$ bits, where $\sigma$ is the alphabet size. In practice, the space reduction is more than $10$-fold, for example on suffix tree of Human Genome. However, this reduction factor remains constant when more sequences are added to the collection. \n\n We develop a new family of self-indexes suited for the repetitive sequence collection setting. Their expected space requirement depends only on the length $n$ of the base sequence and the number $s$ of variations in its repeated copies. That is, the space reduction factor is no longer constant, but depends on $N/n$. We believe the structures developed in this work will provide a fundamental basis for storage and retrieval of individual genomes as they become available due to rapid progress in the sequencing technologies. |
| Pages | 121-137 |
| Conference name | Annual International Conference on Research in Computational Molecular Biology |
| Publisher | Springer-Verlag (Berlin/Heidelberg, Germany) |
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