Bioinformatics Advance Access originally published online on June 3, 2009
Bioinformatics 2009 25(15):1966-1967; doi:10.1093/bioinformatics/btp336
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SOAP2: an improved ultrafast tool for short read alignment


1 Beijing Genomics Institute at Shenzhen, Shenzhen, 518083, China, 2 Department of Biochemistry and Molecular Biology, University of Southern Denmark, Odense M, DK-5230, Denmark and 3 Department of Computer Science, University of Hong Kong, Hong Kong, China
* To whom correspondence should be addressed.
| Abstract |
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Summary: SOAP2 is a significantly improved version of the short oligonucleotide alignment program that both reduces computer memory usage and increases alignment speed at an unprecedented rate. We used a Burrows Wheeler Transformation (BWT) compression index to substitute the seed strategy for indexing the reference sequence in the main memory. We tested it on the whole human genome and found that this new algorithm reduced memory usage from 14.7 to 5.4 GB and improved alignment speed by 20–30 times. SOAP2 is compatible with both single- and paired-end reads. Additionally, this tool now supports multiple text and compressed file formats. A consensus builder has also been developed for consensus assembly and SNP detection from alignment of short reads on a reference genome.
Availability: http://soap.genomics.org.cn
Contact: soap{at}genomics.org.cn
The authors wish it to be known that, in their opinion, the first two authors should be regarded as joint First Authors.
Associate Editor: Joaquin Dopazo
Received on January 23, 2009; revised on April 27, 2009; accepted on May 24, 2009
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