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Published online before print September 13, 2002, 10.1101/gr.323602
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Vol. 12, Issue 10, 1523-1532, October 2002

LETTER
Factors Influencing the Identification of Transcription Factor Binding Sites by Cross-Species Comparison

Lee Ann McCue,1,3 William Thompson,1 C. Steven Carmack,1 and Charles E. Lawrence1,2

1 The Wadsworth Center, New York State Department of Health, Albany, New York 12201-0509, USA; 2 Computer Science Department, Rensselaer Polytechnic Institute, Troy, New York 12180, USA

As the number of sequenced genomes has grown, the questions of which species are most useful and how many genomes are sufficient for comparison have become increasingly important for comparative genomics studies. We have systematically addressed these questions with respect to phylogenetic footprinting of transcription factor (TF) binding sites in the gamma -proteobacteria, and have evaluated the statistical significance of our motif predictions. We used a study set of 166 Escherichia coli genes that have experimentally identified TF binding sites upstream of the gene, with orthologous data from nine additional gamma -proteobacteria for phylogenetic footprinting. Just three species were sufficient for ~74.0% of the motif predictions to correspond to the experimentally reported E. coli sites, and important characteristics to consider when choosing species were phylogenetic distance, genome size, and natural habitat. We also performed simulations using randomized data to determine the critical maximum a posteriori probability (MAP) values for statistical significance of our motif predictions (P = 0.05). Approximately 60% of motif predictions containing sites from just three species had average MAP values above these critical MAP values. The inclusion of a species very closely related to E. coli increased the number of statistically significant motif predictions, despite substantially increasing the critical MAP value.

[Supplemental material is available online at http://www.genome.org. In addition, our motif predictions for the study set and the entire E. coli genome are available online at http://www.wadsworth.org/resnres/bioinfo/.]

3 Corresponding author.

12:1523-1532 ©2002 by Cold Spring Harbor Laboratory Press  ISSN 1088-9051/02 $5.00
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