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Bioinformatics 2005 21(Suppl 1):i195-i203; doi:10.1093/bioinformatics/bti1021
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© The Author 2005. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions{at}oupjournals.org

Tag SNP selection in genotype data for maximizing SNP prediction accuracy

Eran Halperin 1,{dagger}, Gad Kimmel 2,*,{dagger} and Ron Shamir 2

1International Computer Science Institute Berkeley, CA 94704, USA
2School of Computer Science, Tel-Aviv University Tel-Aviv 69978, Israel

*To whom correspondence should be addressed.

Motivation: The search for genetic regions associated with complex diseases, such as cancer or Alzheimer's disease, is an important challenge that may lead to better diagnosis and treatment. The existence of millions of DNA variations, primarily single nucleotide polymorphisms (SNPs), may allow the fine dissection of such associations. However, studies seeking disease association are limited by the cost of genotyping SNPs. Therefore, it is essential to find a small subset of informative SNPs (tag SNPs) that may be used as good representatives of the rest of the SNPs.

Results: We define a new natural measure for evaluating the prediction accuracy of a set of tag SNPs, and use it to develop a new method for tag SNPs selection. Our method is based on a novel algorithm that predicts the values of the rest of the SNPs given the tag SNPs. In contrast to most previous methods, our prediction algorithm uses the genotype information and not the haplotype information of the tag SNPs. Our method is very efficient, and it does not rely on having a block partition of the genomic region.

We compared our method with two state-of-the-art tag SNP selection algorithms on 58 different genotype datasets from four different sources. Our method consistently found tag SNPs with considerably better prediction ability than the other methods.

Availability: The software is available from the authors on request.

Contact: kgad{at}tau.ac.il

Received on January 15, 2005; accepted on March 27, 2005

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