Nucleic Acids Research, 2004, Vol. 32, Database issue D91-D94
© 2004 Oxford University Press
JASPAR: an open-access database for eukaryotic transcription factor binding profiles
Center for Genomics and Bioinformatics, Karolinska Institutet, Berzelius väg 35, S-17177 Stockholm, Sweden and 1 Centre for Molecular Medicine and Therapeutics, Department of Medical Genetics, University of British Columbia, Vancouver, BC, Canada
*To whom correspondence should be addressed. Tel: +46 8 524 86 391; Fax: +46 8 33 79 83; Email: Boris.Lenhard{at}cgb.ki.se
Received August 12, 2003; Revised August 26, 2003; Accepted September 3, 2003
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ABSTRACT |
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 TOP ABSTRACT INTRODUCTIONDERIVATION OF PROFILESTHE CONTENTS OF THE...A JASPAR WEB INTERFACE...A JASPAR APPLICATION PROGRAMMING...AVAILABILITY AND DISTRIBUTIONCONCLUSIONS AND FURTHER...REFERENCES |
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The analysis of regulatory regions in genome sequences is strongly based on the detection of potential transcription factor binding sites. The preferred models for representation of transcription factor binding specificity have been termed position-specific scoring matrices. JASPAR is an open-access database of annotated, high-quality, matrix-based transcription factor binding site profiles for multicellular eukaryotes. The profiles were derived exclusively from sets of nucleotide sequences experimentally demonstrated to bind transcription factors. The database is complemented by a web interface for browsing, searching and subset selection, an online sequence analysis utility and a suite of programming tools for genome-wide and comparative genomic analysis of regulatory regions. JASPAR is available at http://jaspar. cgb.ki.se.
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INTRODUCTION |
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TOPABSTRACTINTRODUCTIONDERIVATION OF PROFILESTHE CONTENTS OF THE...A JASPAR WEB INTERFACE...A JASPAR APPLICATION PROGRAMMING...AVAILABILITY AND DISTRIBUTIONCONCLUSIONS AND FURTHER...REFERENCES |
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The discovery and characterization of regulatory control sequences in completed metazoan genomes have become imperatives as the compilation of successful sequencing projects accelerates. Comparative analysis of the sequences coupled with gene identification software can reliably define the vast majority of exon positions (1), but detection of the sequences regulating gene transcription remains a significant challenge (2). To meet this need, diverse researchers are dedicated to the creation of innovative new algorithms based on phylogenetic footprinting (3,4) and analysis of regulatory modules (5,6). These emerging methods for regulatory sequence analysis are united by their dependence on the quality of available models that represent the binding specificity of transcription factors. Based on years of bioinformatics research, the preferred method for modelling the binding specificity of a transcription factor (TF) has been identified as the position-specific score matrix (PSSM) (7). While higher order models can offer modest performance improvements (8), the extensive binding data required to build such models are available for a limited number of TFs. In order for researchers to move forward with the creation of new algorithms for regulatory sequence analysis, a robust and freely accessible collection of binding models is essential.
We present JASPAR, a database of matrix-based transcription factor binding profiles with associated web interface and tightly integrated programming tools, the aim of which is to warehouse non-redundant representations of high-quality matrix-based transcription factor binding site (TFBS) profiles. In this paper, we provide an outline of the derivation of the profiles in the database, followed by a description of the database web interface and programming tools.
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DERIVATION OF PROFILES |
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TOPABSTRACTINTRODUCTIONDERIVATION OF PROFILESTHE CONTENTS OF THE...A JASPAR WEB INTERFACE...A JASPAR APPLICATION PROGRAMMING...AVAILABILITY AND DISTRIBUTIONCONCLUSIONS AND FURTHER...REFERENCES |
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All profiles in the first public release of the database are derived from published collections of experimentally defined TFBSs for multicellular eukaryotes. The database contains a curated collection of target sequences. The binding sites were determined either in SELEX (9) experiments, or by the collection of data from the experimentally determined binding regions of actual regulatory regions; this distinction is clearly marked in the profile’s annotation. Candidate profiles were included in the database after passing three stages.
Source data acquisition
Published works describing either SELEX experiments or collections of in vivo binding sequences for a candidate transcription factor were identified by review of the scientific literature.
Quality assessment
A candidate profile was approved if the published work satisfied the following criteria: (i) the report was judged to conform to high-quality standards for the experimental detection of TFBSs; (ii) for SELEX experiments, no reports were accepted where determined sites were filtered using arbitrary criteria (such as following a certain consensus), except for exclusion of sites found to be functionally inactive in cells; (iii) bona fide binding site sequences must be unambiguously locatable and obtainable from either the publication or public sequence databases; (iv) transcription factors must originate from multicellular eukaryotes; (v) there must be at least five distinct binding site sequences available; (vi) no profile redundancy was accepted, i.e. not more than one profile describing the binding preference for a particular factor (or dimer of factors) was allowed.
Alignment of known binding sites to produce profiles
Site-containing sequences from the quality-assessment stage were aligned using the motif discovery program ANN-Spec (10). ANN-Spec uses artificial neural networks and Gibbs sampling algorithms for pattern finding and is specifically intended for DNA binding site discovery. As the algorithm is probabilistic, results vary and are impacted by initial settings for motif length. Therefore, for each candidate, ANN-Spec alignments using three random seeds, all possible strand orientations, and 80 000 iterations were visually inspected to determine an acceptable range of possible widths. Subsequent alignment selection and decision on final inclusion were based on biological knowledge about the TFs and their binding sites.
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THE CONTENTS OF THE JASPAR DATABASE |
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TOPABSTRACTINTRODUCTIONDERIVATION OF PROFILESTHE CONTENTS OF THE...A JASPAR WEB INTERFACE...A JASPAR APPLICATION PROGRAMMING...AVAILABILITY AND DISTRIBUTIONCONCLUSIONS AND FURTHER...REFERENCES |
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At present, there are 111 profiles in the database. The contents of the JASPAR database are summarized in Table 1. The present collection is restricted to profiles from multicellular eukaryotes with enough experimental data for the derivation of robust, high-quality profiles. User guidance for the expansion and improvement of the JASPAR profile collection is strongly encouraged. Due to quality concerns and probable differences in methodologies, however, it is not possible to accept user-submitted profiles without curatorial review.
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A JASPAR WEB INTERFACE AND ONLINE SERVICES |
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TOPABSTRACTINTRODUCTIONDERIVATION OF PROFILESTHE CONTENTS OF THE...A JASPAR WEB INTERFACE...A JASPAR APPLICATION PROGRAMMING...AVAILABILITY AND DISTRIBUTIONCONCLUSIONS AND FURTHER...REFERENCES |
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We have developed a streamlined web interface to the JASPAR database. Through the web system, users may perform the following tasks.
(i) Browse the TF binding profile collection. The purpose of the profile browser is to present the user with a quick overview of the contents of JASPAR. The profiles can be viewed in groups based on specified criteria (identifiers, structural class of the binding domain, species or names).
(ii) Search the profiles by identifiers or annotations. The search engine is designed to quickly locate subsets of the profile based on their annotation.
(iii) Compare user-entered profiles with existing profiles in the database. This function enables users to determine whether a newly discovered profile is similar to an existing profile, using a modified matrix-to-matrix Needleman–Wunsch (11) comparison algorithm (12). This service is intended for the growing number of researchers confronted by putative binding site patterns shared by genes found to be co-expressed in expression profiling studies.
(iv) Search a user-specified nucleotide sequence with selected transcription factor profiles. The JASPAR web interface provides only basic search and graphical output here—for more sophisticated sequence searches, users are directed to the ConSite web service (http://www.phylofoot. org/consite) for TFBS detection (3).
Selected profiles are presented using sequence logos (13), alongside basic annotations, each connected with a pop-up window presenting fully detailed annotation. A sample of search results with accompanying profile annotation data is given in Figure 1.
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A JASPAR APPLICATION PROGRAMMING INTERFACE |
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TOPABSTRACTINTRODUCTIONDERIVATION OF PROFILESTHE CONTENTS OF THE...A JASPAR WEB INTERFACE...A JASPAR APPLICATION PROGRAMMING...AVAILABILITY AND DISTRIBUTIONCONCLUSIONS AND FURTHER...REFERENCES |
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To maximize the utility of the JASPAR profiles for genome-wide sequence analysis, the database is tightly integrated with the TFBS Perl framework for TFBS analysis (14), available at http://forkhead.cgb.ki.se/TFBS. The TFBS system has been upgraded to take full advantage of the new JASPAR database. We have introduced new database modules and expanded existing ones to enable the storage and exchange of fully annotated profiles from JASPAR and other resources. In effect, TFBS is a fully functional application programming interface to the JASPAR database.
In addition to JASPAR-specific refinements, the creation of the new profiles database motivated further functional enhancements of TFBS. TFBS now can accept word-based motifs and supports the use of a leading word-based pattern discovery algorithm (15). The new and expanded modules are listed in Table 2.
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AVAILABILITY AND DISTRIBUTION |
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TOPABSTRACTINTRODUCTIONDERIVATION OF PROFILESTHE CONTENTS OF THE...A JASPAR WEB INTERFACE...A JASPAR APPLICATION PROGRAMMING...AVAILABILITY AND DISTRIBUTIONCONCLUSIONS AND FURTHER...REFERENCES |
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The entire contents of the JASPAR database can be downloaded from http://jaspar.cgb.ki.se, either as a MySQL database dump that can be used to reconstitute a local copy of the database, or as a flat-file format suitable for direct use or in conjunction with the TFBS programming framework. In addition, the web interface supports retrieval of subsets of matrices for use in emerging web-based analysis tools, such as Cluster-Buster (16), MSCAN (17) or MCAST (18). The download service and web interface may be used without restriction.
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CONCLUSIONS AND FURTHER DIRECTIONS |
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TOPABSTRACTINTRODUCTIONDERIVATION OF PROFILESTHE CONTENTS OF THE...A JASPAR WEB INTERFACE...A JASPAR APPLICATION PROGRAMMING...AVAILABILITY AND DISTRIBUTIONCONCLUSIONS AND FURTHER...REFERENCES |
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In its present form, JASPAR offers significant advantages compared with similarly scoped resources: (i) it is a non-redundant collection of reliable binding profiles; (ii) data access is unrestricted; (iii) it is powerfully coupled to programming tools: the database is ready to be deployed quickly for genome-wide studies through the JASPAR API.
JASPAR is distinct from TRANSFAC (19), the leading TF database. TRANSFAC maintains a broader mission in data collection, contains a redundant set of binding profiles of diverse quality and is marketed as a commercial resource with only a portion of its contents available in public versions. Users will find different database composition between the two systems, as the data were independently gathered.
JASPAR will continue to expand and existing profiles will be improved as new data emerge. In addition to the ongoing efforts of the authors, the diverse and growing population of JASPAR users is providing directed feedback on literature sources for additional binding profiles. We are presently finalizing a regulatory region annotation tool that will facilitate the collection of literature-based regulatory modules from metazoan genes to include in future releases. This tool will be coupled to JASPAR to dynamically build TF binding profiles. Additional efforts are underway to incorporate yeast binding profiles (both literature and footprinting derived). For users interested in combining binding profiles from multiple resources, the TFBS framework provides seamless integration on the programming level between JASPAR and other collections.
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TOPABSTRACTINTRODUCTIONDERIVATION OF PROFILESTHE CONTENTS OF THE...A JASPAR WEB INTERFACE...A JASPAR APPLICATION PROGRAMMING...AVAILABILITY AND DISTRIBUTIONCONCLUSIONS AND FURTHER...REFERENCES |
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