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<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en">DASMIweb: online integration, analysis and assessment of distributed protein interaction data</title><author><name sortKey="Blankenburg, Hagen" sort="Blankenburg, Hagen" uniqKey="Blankenburg H" first="Hagen" last="Blankenburg">Hagen Blankenburg</name></author><author><name sortKey="Ramirez, Fidel" sort="Ramirez, Fidel" uniqKey="Ramirez F" first="Fidel" last="Ramírez">Fidel Ramírez</name></author><author><name sortKey="Buch, Joachim" sort="Buch, Joachim" uniqKey="Buch J" first="Joachim" last="Büch">Joachim Büch</name></author><author><name sortKey="Albrecht, Mario" sort="Albrecht, Mario" uniqKey="Albrecht M" first="Mario" last="Albrecht">Mario Albrecht</name></author></titleStmt><publicationStmt><idno type="wicri:source">PMC</idno><idno type="pmid">19502495</idno><idno type="pmc">2703953</idno><idno type="url">http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2703953</idno><idno type="RBID">PMC:2703953</idno><idno type="doi">10.1093/nar/gkp438</idno><date when="2009">2009</date><idno type="wicri:Area/Pmc/Corpus">000575</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main">DASMIweb: online integration, analysis and assessment of distributed protein interaction data</title><author><name sortKey="Blankenburg, Hagen" sort="Blankenburg, Hagen" uniqKey="Blankenburg H" first="Hagen" last="Blankenburg">Hagen Blankenburg</name></author><author><name sortKey="Ramirez, Fidel" sort="Ramirez, Fidel" uniqKey="Ramirez F" first="Fidel" last="Ramírez">Fidel Ramírez</name></author><author><name sortKey="Buch, Joachim" sort="Buch, Joachim" uniqKey="Buch J" first="Joachim" last="Büch">Joachim Büch</name></author><author><name sortKey="Albrecht, Mario" sort="Albrecht, Mario" uniqKey="Albrecht M" first="Mario" last="Albrecht">Mario Albrecht</name></author></analytic><series><title level="j">Nucleic Acids Research</title><idno type="ISSN">0305-1048</idno><idno type="eISSN">1362-4962</idno><imprint><date when="2009">2009</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en"><p>In recent years, we have witnessed a substantial increase of the amount of available protein interaction data. However, most data are currently not readily accessible to the biologist at a single site, but scattered over multiple online repositories. Therefore, we have developed the DASMIweb server that affords the integration, analysis and qualitative assessment of distributed sources of interaction data in a dynamic fashion. Since DASMIweb allows for querying many different resources of protein and domain interactions simultaneously, it serves as an important starting point for interactome studies and assists the user in finding publicly accessible interaction data with minimal effort. The pool of queried resources is fully configurable and supports the inclusion of own interaction data or confidence scores. In particular, DASMIweb integrates confidence measures like functional similarity scores to assess individual interactions. The retrieved results can be exported in different file formats like MITAB or SIF. DASMIweb is freely available at <ext-link ext-link-type="uri" xlink:href="http://www.dasmiweb.de">http://www.dasmiweb.de</ext-link>.</p></div></front><back><div1 type="bibliography"><listBibl><biblStruct><analytic><author><name sortKey="Frishman, D" uniqKey="Frishman D">D Frishman</name></author><author><name sortKey="Albrecht, M" uniqKey="Albrecht M">M Albrecht</name></author><author><name sortKey="Blankenburg, H" uniqKey="Blankenburg H">H Blankenburg</name></author><author><name sortKey="Bork, P" uniqKey="Bork P">P Bork</name></author><author><name sortKey="Harrington, Ed" uniqKey="Harrington E">ED Harrington</name></author><author><name sortKey="Hermjakob, H" uniqKey="Hermjakob H">H Hermjakob</name></author><author><name sortKey="Jensen, Lj" uniqKey="Jensen L">LJ Jensen</name></author><author><name sortKey="Juan, Da" uniqKey="Juan D">DA Juan</name></author><author><name sortKey="Lengauer, T" uniqKey="Lengauer T">T Lengauer</name></author><author><name sortKey="Pagel, P" 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<front><journal-meta><journal-id journal-id-type="nlm-ta">Nucleic Acids Res</journal-id><journal-id journal-id-type="iso-abbrev">Nucleic Acids Res</journal-id><journal-id journal-id-type="publisher-id">nar</journal-id><journal-id journal-id-type="hwp">nar</journal-id><journal-title-group><journal-title>Nucleic Acids Research</journal-title></journal-title-group><issn pub-type="ppub">0305-1048</issn><issn pub-type="epub">1362-4962</issn><publisher><publisher-name>Oxford University Press</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="pmid">19502495</article-id><article-id pub-id-type="pmc">2703953</article-id><article-id pub-id-type="doi">10.1093/nar/gkp438</article-id><article-id pub-id-type="publisher-id">gkp438</article-id><article-categories><subj-group subj-group-type="heading"><subject>Articles</subject></subj-group></article-categories><title-group><article-title>DASMIweb: online integration, analysis and assessment of distributed protein interaction data</article-title></title-group><contrib-group><contrib contrib-type="author"><name><surname>Blankenburg</surname><given-names>Hagen</given-names></name><xref ref-type="corresp" rid="COR1">*</xref></contrib><contrib contrib-type="author"><name><surname>Ramírez</surname><given-names>Fidel</given-names></name></contrib><contrib contrib-type="author"><name><surname>Büch</surname><given-names>Joachim</given-names></name></contrib><contrib contrib-type="author"><name><surname>Albrecht</surname><given-names>Mario</given-names></name></contrib></contrib-group><aff>Max Planck Institute for Informatics, Campus E1.4, 66123 Saarbrücken, Germany</aff><author-notes><corresp id="COR1">*To whom correspondence should be addressed. Tel: <phone>+49 681 9325 328</phone>; Fax: <fax>+49 681 9325 399</fax>; Email: <email>hagen.blankenburg@mpi-inf.mpg.de</email></corresp></author-notes><pub-date pub-type="ppub"><day>1</day><month>7</month><year>2009</year></pub-date><pub-date pub-type="epub"><day>5</day><month>6</month><year>2009</year></pub-date><pub-date pub-type="pmc-release"><day>5</day><month>6</month><year>2009</year></pub-date><pmc-comment> PMC Release delay is 0 months and 0 days and was based on the
<volume>37</volume><issue>Web Server issue</issue><fpage>W122</fpage><lpage>W128</lpage><history><date date-type="received"><day>28</day><month>2</month><year>2009</year></date><date date-type="rev-recd"><day>25</day><month>4</month><year>2009</year></date><date date-type="accepted"><day>11</day><month>5</month><year>2009</year></date></history><permissions><copyright-statement>© 2009 The Author(s)</copyright-statement><copyright-year>2009</copyright-year><license license-type="creative-commons" xlink:href="http://creativecommons.org/licenses/by-nc/2.0/uk/"><license-p><pmc-comment>CREATIVE COMMONS</pmc-comment>This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (<ext-link ext-link-type="uri" xlink:href="http://creativecommons.org/licenses/by-nc/2.0/uk/">http://creativecommons.org/licenses/by-nc/2.0/uk/</ext-link>) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.</license-p></license></permissions><abstract><p>In recent years, we have witnessed a substantial increase of the amount of available protein interaction data. However, most data are currently not readily accessible to the biologist at a single site, but scattered over multiple online repositories. Therefore, we have developed the DASMIweb server that affords the integration, analysis and qualitative assessment of distributed sources of interaction data in a dynamic fashion. Since DASMIweb allows for querying many different resources of protein and domain interactions simultaneously, it serves as an important starting point for interactome studies and assists the user in finding publicly accessible interaction data with minimal effort. The pool of queried resources is fully configurable and supports the inclusion of own interaction data or confidence scores. In particular, DASMIweb integrates confidence measures like functional similarity scores to assess individual interactions. The retrieved results can be exported in different file formats like MITAB or SIF. DASMIweb is freely available at <ext-link ext-link-type="uri" xlink:href="http://www.dasmiweb.de">http://www.dasmiweb.de</ext-link>.</p></abstract></article-meta></front><body><sec><title>INTRODUCTION</title><p>Protein interactions play an important role in many cellular processes (<xref ref-type="bibr" rid="B1">1</xref>). Different small- and large-scale experimental techniques together with the manual curation of the scientific literature as well as numerous computational prediction methods generate ever increasing amounts of publicly accessible protein interaction data (<xref ref-type="bibr" rid="B2">2</xref>). However, this rapid accumulation of data renders it difficult for researchers to keep track of all available information because they are scattered over multiple online repositories. As of April 2009, the pathway resource list Pathguide (<xref ref-type="bibr" rid="B3">3</xref>) gives the impressive number of 118 databases providing protein interaction data. Some of these projects are highly specialized and focus, for example, on interactions of molecular subcomponents or specific classes of proteins, on specific diseases or organisms, or on experimentally observed or computationally predicted interactions. Moreover, doubts have been raised about the quality and reliability of protein interaction data and particular detection methods (<xref ref-type="bibr" rid="B2">2</xref>,<xref ref-type="bibr" rid="B4">4</xref>,<xref ref-type="bibr" rid="B5">5</xref>).</p><p>Databases that collect and curate experimentally observed protein–protein interactions reported in the literature (<xref ref-type="bibr" rid="B6 B7 B8 B9 B10 B11 B12 B13">6–13</xref>) are essential pillars of interactomics, but they cover only a small fraction of the complete set of interactions, and thus proteome-wide predictions are also required (<xref ref-type="bibr" rid="B2">2</xref>,<xref ref-type="bibr" rid="B4">4</xref>). All these efforts have resulted in a multitude of resources that the user has to query individually. Initiatives like IMEx (<xref ref-type="bibr" rid="B14">14</xref>) that promote data exchange between some of the databases are very important, but are still in an early implementation phase. One of the possible solutions to integrate protein interaction data is the creation of data warehouses as composite databases that centrally store and merge the available data from multiple sources (<xref ref-type="bibr" rid="B10">10</xref>,<xref ref-type="bibr" rid="B11">11</xref>,<xref ref-type="bibr" rid="B15 B16 B17 B18 B19 B20 B21 B22 B23">15–23</xref>). However, the static data unification procedure underlying data warehouses has the considerable drawback of providing only a snapshot of a fixed number of data sources at a certain point of time. Once the data have been included into the central repository, curation efforts are required to keep it up to date and in sync with the original data sources. Furthermore, data warehouses are rather inflexible as the inclusion of additional datasets, for example, new experimental or predicted data or improved confidence scores, can normally be accomplished solely by the central authority and not by the user.</p><p>In the context of the European BioSapiens network (<xref ref-type="bibr" rid="B24">24</xref>), we have developed DASMIweb as a gateway to interactome data from multiple resources. In contrast to composite databases, data are not stored in a local repository, but queries are distributed to the original data sources and the unified results are displayed (<xref ref-type="bibr" rid="B25">25</xref>). Due to this novel realization as a distributed and dynamic system, DASMIweb bypasses the inherent rigidity of static databases and addresses their problem of data update cycles. In addition, DASMIweb allows access to distributed servers with confidence scores, which can be used to evaluate the quality of individual interactions with different scoring methods.</p></sec><sec sec-type="materials|methods"><title>MATERIALS AND METHODS</title><sec><title>Distributed architecture</title><p>The fundamental concept of DASMIweb is decentralization (<xref ref-type="fig" rid="F1">Figure 1</xref>). Here, the interaction data remain distributed with their original providers instead of being periodically aggregated into central data repositories (<xref ref-type="bibr" rid="B10">10</xref>,<xref ref-type="bibr" rid="B11">11</xref>,<xref ref-type="bibr" rid="B15 B16 B17 B18 B19 B20 B21 B22 B23">15–23</xref>). Subsequent to a user request, DASMIweb independently queries each original data provider for interactions, additional annotations, and interaction confidence scores. Then it unifies the retrieved results and presents them to the user.
<fig id="F1" position="float"><label>Figure 1.</label><caption><p>Decentralized architecture of DASMIweb. Data sources for protein and domain interactions as well as for interaction confidence scores are distributed over the Internet and are contacted by DASMIweb upon user request.</p></caption><graphic xlink:href="gkp438f1"></graphic></fig></p><p>The technical architecture of DASMIweb, based on an extension of the Distributed Annotation System (DAS) (<xref ref-type="bibr" rid="B25">25</xref>,<xref ref-type="bibr" rid="B26">26</xref>) and different types of web services (<xref ref-type="bibr" rid="B27">27</xref>,<xref ref-type="bibr" rid="B28">28</xref>), has the great advantage of being easily extendable with new data sources. In addition, data update cycles every few weeks or months are not necessary because all data is left in its source database and is only retrieved on request. This use of a distributed architecture greatly empowers the end-user who can instantly add data sources, for instance, own private interactions or the results of an improved confidence scoring method. DASMIweb also gives data providers the possibility to easily share their results without the time-consuming development of own web interfaces. Since the distributed architecture supported by DASMIweb is driven by the community that provides the contents, there is no need for central authorities to decide on the available resources. This is exemplarily evident in the case of confidence scoring methods, which can be based on various criteria, for instance, co-expression, co-localization, functional co-annotation, network topology and evolutionary conservation. Apparently, it would be impractical to implement and maintain all these different methods at a single site. Instead, each method developed by some independent institution can be queried through DASMIweb. It is noteworthy that our decentralization approach has also found the interest of the Proteomics Standards Initiative (PSI) of the Human Proteome Organization (HUPO), which is currently defining standards for distributed interaction data retrieval and interaction confidence scoring (<xref ref-type="bibr" rid="B28">28</xref>). We are actively contributing to these projects and all servers developed in this context are accessible via DASMIweb (<xref ref-type="table" rid="T1">Table 1</xref>).
<table-wrap id="T1" position="float"><label>Table 1.</label><caption><p>Interaction datasets currently available as data sources through DASMIweb and corresponding references</p></caption><table frame="hsides" rules="groups"><thead align="left"><tr><th rowspan="1" colspan="1">Dataset name</th><th rowspan="1" colspan="1">Interaction type</th><th rowspan="1" colspan="1">Determination method</th><th rowspan="1" colspan="1">Server type</th><th rowspan="1" colspan="1">Reference</th></tr></thead><tbody align="left"><tr><td rowspan="1" colspan="1">CCSB-HI1</td><td rowspan="1" colspan="1">PPI</td><td rowspan="1" colspan="1">Large-scale experiment</td><td rowspan="1" colspan="1">DASMI</td><td rowspan="1" colspan="1">(<xref ref-type="bibr" rid="B37">37</xref>)</td></tr><tr><td rowspan="1" colspan="1">MDC</td><td rowspan="1" colspan="1">PPI</td><td rowspan="1" colspan="1">Large-scale experiment</td><td rowspan="1" colspan="1">DASMI</td><td rowspan="1" colspan="1">(<xref ref-type="bibr" rid="B38">38</xref>)</td></tr><tr><td rowspan="1" colspan="1">BioGRID</td><td rowspan="1" colspan="1">PPI</td><td rowspan="1" colspan="1">Literature curation</td><td rowspan="1" colspan="1">PSI WS</td><td rowspan="1" colspan="1">(<xref ref-type="bibr" rid="B10">10</xref>)</td></tr><tr><td rowspan="1" colspan="1">DIP</td><td rowspan="1" colspan="1">PPI</td><td rowspan="1" colspan="1">Literature curation</td><td rowspan="1" colspan="1">DASMI</td><td rowspan="1" colspan="1">(<xref ref-type="bibr" rid="B8">8</xref>)</td></tr><tr><td rowspan="1" colspan="1">HPRD</td><td rowspan="1" colspan="1">PPI</td><td rowspan="1" colspan="1">Literature curation</td><td rowspan="1" colspan="1">DASMI</td><td rowspan="1" colspan="1">(<xref ref-type="bibr" rid="B13">13</xref>)</td></tr><tr><td rowspan="1" colspan="1">IntAct</td><td rowspan="1" colspan="1">PPI</td><td rowspan="1" colspan="1">Literature curation</td><td rowspan="1" colspan="1">PSI WS</td><td rowspan="1" colspan="1">(<xref ref-type="bibr" rid="B12">12</xref>)</td></tr><tr><td rowspan="1" colspan="1">MINT</td><td rowspan="1" colspan="1">PPI</td><td rowspan="1" colspan="1">Literature curation</td><td rowspan="1" colspan="1">PSI WS</td><td rowspan="1" colspan="1">(<xref ref-type="bibr" rid="B6">6</xref>)</td></tr><tr><td rowspan="1" colspan="1">MPIDB</td><td rowspan="1" colspan="1">PPI</td><td rowspan="1" colspan="1">Literature curation</td><td rowspan="1" colspan="1">PSI WS</td><td rowspan="1" colspan="1">(<xref ref-type="bibr" rid="B11">11</xref>)</td></tr><tr><td rowspan="1" colspan="1">Bioverse</td><td rowspan="1" colspan="1">PPI</td><td rowspan="1" colspan="1">Prediction</td><td rowspan="1" colspan="1">DASMI</td><td rowspan="1" colspan="1">(<xref ref-type="bibr" rid="B39">39</xref>)</td></tr><tr><td rowspan="1" colspan="1">HiMAP</td><td rowspan="1" colspan="1">PPI</td><td rowspan="1" colspan="1">Prediction</td><td rowspan="1" colspan="1">DASMI</td><td rowspan="1" colspan="1">(<xref ref-type="bibr" rid="B40">40</xref>)</td></tr><tr><td rowspan="1" colspan="1">HiMAP core</td><td rowspan="1" colspan="1">PPI</td><td rowspan="1" colspan="1">Prediction</td><td rowspan="1" colspan="1">DASMI</td><td rowspan="1" colspan="1">(<xref ref-type="bibr" rid="B40">40</xref>)</td></tr><tr><td rowspan="1" colspan="1">HomoMINT</td><td rowspan="1" colspan="1">PPI</td><td rowspan="1" colspan="1">Prediction</td><td rowspan="1" colspan="1">DASMI</td><td rowspan="1" colspan="1">(<xref ref-type="bibr" rid="B41">41</xref>)</td></tr><tr><td rowspan="1" colspan="1">OPHID</td><td rowspan="1" colspan="1">PPI</td><td rowspan="1" colspan="1">Prediction</td><td rowspan="1" colspan="1">DASMI</td><td rowspan="1" colspan="1">(<xref ref-type="bibr" rid="B42">42</xref>)</td></tr><tr><td rowspan="1" colspan="1">POINT</td><td rowspan="1" colspan="1">PPI</td><td rowspan="1" colspan="1">Prediction</td><td rowspan="1" colspan="1">DASMI</td><td rowspan="1" colspan="1">(<xref ref-type="bibr" rid="B43">43</xref>)</td></tr><tr><td rowspan="1" colspan="1">Sanger</td><td rowspan="1" colspan="1">PPI</td><td rowspan="1" colspan="1">Prediction</td><td rowspan="1" colspan="1">DASMI</td><td rowspan="1" colspan="1">(<xref ref-type="bibr" rid="B44">44</xref>)</td></tr><tr><td rowspan="1" colspan="1">Sanger core</td><td rowspan="1" colspan="1">PPI</td><td rowspan="1" colspan="1">Prediction</td><td rowspan="1" colspan="1">DASMI</td><td rowspan="1" colspan="1">(<xref ref-type="bibr" rid="B44">44</xref>)</td></tr><tr><td rowspan="1" colspan="1">3did</td><td rowspan="1" colspan="1">DDI</td><td rowspan="1" colspan="1">3D structure analysis</td><td rowspan="1" colspan="1">DASMI</td><td rowspan="1" colspan="1">(<xref ref-type="bibr" rid="B45">45</xref>)</td></tr><tr><td rowspan="1" colspan="1">iPfam</td><td rowspan="1" colspan="1">DDI</td><td rowspan="1" colspan="1">3D structure analysis</td><td rowspan="1" colspan="1">DASMI</td><td rowspan="1" colspan="1">(<xref ref-type="bibr" rid="B46">46</xref>)</td></tr><tr><td rowspan="1" colspan="1">PiNS</td><td rowspan="1" colspan="1">DDI</td><td rowspan="1" colspan="1">3D structure analysis</td><td rowspan="1" colspan="1">DASMI</td><td rowspan="1" colspan="1">(<xref ref-type="bibr" rid="B47">47</xref>)</td></tr><tr><td rowspan="1" colspan="1">APMM1</td><td rowspan="1" colspan="1">DDI</td><td rowspan="1" colspan="1">Prediction</td><td rowspan="1" colspan="1">DASMI</td><td rowspan="1" colspan="1">(<xref ref-type="bibr" rid="B48">48</xref>)</td></tr><tr><td rowspan="1" colspan="1">APMM2</td><td rowspan="1" colspan="1">DDI</td><td rowspan="1" colspan="1">Prediction</td><td rowspan="1" colspan="1">DASMI</td><td rowspan="1" colspan="1">(<xref ref-type="bibr" rid="B48">48</xref>)</td></tr><tr><td rowspan="1" colspan="1">DIMA 2.0 dprof</td><td rowspan="1" colspan="1">DDI</td><td rowspan="1" colspan="1">Prediction</td><td rowspan="1" colspan="1">DASMI</td><td rowspan="1" colspan="1">(<xref ref-type="bibr" rid="B18">18</xref>)</td></tr><tr><td rowspan="1" colspan="1">DIMA 2.0 dpea</td><td rowspan="1" colspan="1">DDI</td><td rowspan="1" colspan="1">Prediction</td><td rowspan="1" colspan="1">DASMI</td><td rowspan="1" colspan="1">(<xref ref-type="bibr" rid="B18">18</xref>)</td></tr><tr><td rowspan="1" colspan="1">DIMA 2.0 string</td><td rowspan="1" colspan="1">DDI</td><td rowspan="1" colspan="1">Prediction</td><td rowspan="1" colspan="1">DASMI</td><td rowspan="1" colspan="1">(<xref ref-type="bibr" rid="B18">18</xref>)</td></tr><tr><td rowspan="1" colspan="1">DPEA</td><td rowspan="1" colspan="1">DDI</td><td rowspan="1" colspan="1">Prediction</td><td rowspan="1" colspan="1">DASMI</td><td rowspan="1" colspan="1">(<xref ref-type="bibr" rid="B49">49</xref>)</td></tr><tr><td rowspan="1" colspan="1">InterDom</td><td rowspan="1" colspan="1">DDI</td><td rowspan="1" colspan="1">Prediction</td><td rowspan="1" colspan="1">DASMI</td><td rowspan="1" colspan="1">(<xref ref-type="bibr" rid="B50">50</xref>)</td></tr><tr><td rowspan="1" colspan="1">IPPRI</td><td rowspan="1" colspan="1">DDI</td><td rowspan="1" colspan="1">Prediction</td><td rowspan="1" colspan="1">DASMI</td><td rowspan="1" colspan="1">(<xref ref-type="bibr" rid="B51">51</xref>)</td></tr><tr><td rowspan="1" colspan="1">IPPRI core</td><td rowspan="1" colspan="1">DDI</td><td rowspan="1" colspan="1">Prediction</td><td rowspan="1" colspan="1">DASMI</td><td rowspan="1" colspan="1">(<xref ref-type="bibr" rid="B51">51</xref>)</td></tr><tr><td rowspan="1" colspan="1">LDSC</td><td rowspan="1" colspan="1">DDI</td><td rowspan="1" colspan="1">Prediction</td><td rowspan="1" colspan="1">DASMI</td><td rowspan="1" colspan="1">(<xref ref-type="bibr" rid="B52">52</xref>)</td></tr><tr><td rowspan="1" colspan="1">LDSC core</td><td rowspan="1" colspan="1">DDI</td><td rowspan="1" colspan="1">Prediction</td><td rowspan="1" colspan="1">DASMI</td><td rowspan="1" colspan="1">(<xref ref-type="bibr" rid="B52">52</xref>)</td></tr><tr><td rowspan="1" colspan="1">LLZ</td><td rowspan="1" colspan="1">DDI</td><td rowspan="1" colspan="1">Prediction</td><td rowspan="1" colspan="1">DASMI</td><td rowspan="1" colspan="1">(<xref ref-type="bibr" rid="B53">53</xref>)</td></tr><tr><td rowspan="1" colspan="1">LP</td><td rowspan="1" colspan="1">DDI</td><td rowspan="1" colspan="1">Prediction</td><td rowspan="1" colspan="1">DASMI</td><td rowspan="1" colspan="1">(<xref ref-type="bibr" rid="B54">54</xref>)</td></tr><tr><td rowspan="1" colspan="1">RCDP50</td><td rowspan="1" colspan="1">DDI</td><td rowspan="1" colspan="1">Prediction</td><td rowspan="1" colspan="1">DASMI</td><td rowspan="1" colspan="1">(<xref ref-type="bibr" rid="B55">55</xref>)</td></tr><tr><td rowspan="1" colspan="1">RDFF</td><td rowspan="1" colspan="1">DDI</td><td rowspan="1" colspan="1">Prediction</td><td rowspan="1" colspan="1">DASMI</td><td rowspan="1" colspan="1">(<xref ref-type="bibr" rid="B56">56</xref>)</td></tr><tr><td rowspan="1" colspan="1">TW</td><td rowspan="1" colspan="1">DDI</td><td rowspan="1" colspan="1">Prediction</td><td rowspan="1" colspan="1">DASMI</td><td rowspan="1" colspan="1">(<xref ref-type="bibr" rid="B57">57</xref>)</td></tr><tr><td rowspan="1" colspan="1">FunSimMat</td><td rowspan="1" colspan="1">PPI-CM</td><td rowspan="1" colspan="1">Gene Ontology-based</td><td rowspan="1" colspan="1">DASMI</td><td rowspan="1" colspan="1">(<xref ref-type="bibr" rid="B58">58</xref>,<xref ref-type="bibr" rid="B59">59</xref>)</td></tr><tr><td rowspan="1" colspan="1">Domain support</td><td rowspan="1" colspan="1">PPI-CM</td><td rowspan="1" colspan="1">DDI-based</td><td rowspan="1" colspan="1">DASMI</td><td rowspan="1" colspan="1">(<xref ref-type="bibr" rid="B2">2</xref>)</td></tr></tbody></table><table-wrap-foot><fn><p>The interaction type PPI indicates protein–protein interactions, DDI domain–domain interactions, and PPI-CM confidence measures that can be used to asses the quality of protein–protein interactions. The server type DASMI indicates data sources that are available by an extension of the DAS protocol, and PSI WS denotes web services following the standard currently being developed by HUPO-PSI.</p></fn></table-wrap-foot></table-wrap></p></sec><sec><title>Data sources</title><p>DASMIweb has been developed to support different levels of molecular interactions, for example, interactions of proteins as well as of protein domains. In the following, we will refer to the distributed data servers that provide interactions, additional annotations or interaction confidence scores, as <italic>data sources</italic> (in contrast to our <italic>server</italic> DASMIweb). As of April 2009, DASMIweb provides access to 35 data sources containing experimentally determined and computationally derived protein and domain interaction datasets (<xref ref-type="table" rid="T1">Table 1</xref>). In addition, there are two data sources for scoring the confidence of protein–protein interactions.</p><p>In our current setup, the majority of data sources are temporarily cached and maintained at our institute, even if this appears to be a contradiction to the actual DASMIweb aim of leaving the interaction data with their original providers. At present, this setup is unavoidable for demonstrating the capabilities of our system; otherwise, many more external data source providers would already be needed from the beginning. Nevertheless, several major protein interaction databases like BioGrid (<xref ref-type="bibr" rid="B10">10</xref>), IntAct (<xref ref-type="bibr" rid="B12">12</xref>) and MINT (<xref ref-type="bibr" rid="B6">6</xref>) are not cached as they already support external web service access to their data. Moreover, since most of the cached datasets are the results of single studies, they are not updated by their authors and do not require any maintenance efforts. The other data sources are updated by us on a monthly basis. Of course, we will replace a temporary cached source as soon as the respective original provider supports web service access to its data.</p><p>The current selection of data sources listed in <xref ref-type="table" rid="T1">Table 1</xref> is only a snapshot, additional resources for interactions and confidence scores are currently being prepared at other institutions for public access in the near future. At the moment, there are two alternative ways for providing new data sources. The first option is the download of a server library from our website <ext-link ext-link-type="uri" xlink:href="http://www.dasmi.de">http://www.dasmi.de</ext-link>. This software, available as Java and Perl implementations, parses interaction data from several standard file formats and serves them in a format supported by DASMIweb (<xref ref-type="bibr" rid="B25">25</xref>). An online tutorial on setting up own data sources is available on our website. Data sources that provide confidence scores are handled like sources that contain interaction data and can be set up using the same software library. The second option is the implementation of a web service that follows the standard currently defined by HUPO-PSI (<xref ref-type="bibr" rid="B28">28</xref>). However, as this standard is not yet published, it might still evolve.</p></sec><sec><title>Identifier mapping</title><p>Proteomics research uses a substantial diversity of object identifiers for describing genes, proteins or protein domains. Accordingly, interaction datasets use a variety of identifier systems for their data (<xref ref-type="bibr" rid="B2">2</xref>). In order to unify them, DASMIweb maintains internal mapping tables derived from iProClass (<xref ref-type="bibr" rid="B29">29</xref>) and Pfam (<xref ref-type="bibr" rid="B30">30</xref>) to convert identifiers between the different systems. For protein interactions, DASMIweb currently supports the identifier systems Ensembl (<xref ref-type="bibr" rid="B31">31</xref>), Entrez Gene (<xref ref-type="bibr" rid="B32">32</xref>), Entrez Geneinfo (<xref ref-type="bibr" rid="B32">32</xref>), RefSeq (<xref ref-type="bibr" rid="B32">32</xref>) and UniProtKB (<xref ref-type="bibr" rid="B33">33</xref>). In the following, we will refer to these identifier systems as compatible systems because mappings exist between them. The mappings enable DASMIweb to merge results from data sources that employ different but compatible identifier system. For example, if the user requests all huntingtin interactions known for the UniProtKB protein ‘HD_HUMAN’, DASMIweb will automatically convert this identifier to the Entrez Gene identifier ‘3064’, the RefSeq identifier ‘NP_002102.4’, and all other compatible identifier systems described above. Subsequently, data sources providing interactions in the Entrez Gene or RefSeq identifier system will be queried in addition to data sources that use the requested UniProtKB identifier system. The final unification of interactions from different data sources is performed by converting all identifiers to Entrez Gene identifiers. Therefore, the DASMIweb results are independent of the particular identifier system used for querying; in the prior example, a query for ‘HD_HUMAN’ will return the same results as the one for ‘NP_002102.4’ or ‘3064’.</p><p>It should be noted that the identifier mapping procedure can result in considerable, but unavoidable, computational overhead. While there is usually a one-to-one mapping from UniProtKB to Entrez Gene identifiers, mapping in the opposite direction may produce multiple results as one gene can be responsible for several protein variants or fragments. Therefore, in the exemplary case when the user queries DASMIweb with the Entrez Gene identifier ‘3064’, it will be converted to two UniProtKB entries ‘Q59FF4’ and ‘P42858’. Consequently, all interactions reported for the two protein variants or fragments will be included. Fortunately, the identifier diversity for domain interaction datasets is less problematic as stable Pfam identifiers (<xref ref-type="bibr" rid="B30">30</xref>) are predominantly used.</p></sec></sec><sec><title>USER INTERFACE</title><p>Our primary goal while designing DASMIweb was user-friendliness, which we tried to achieve by an intuitive user interface and a clear representation of the results. In addition, several tutorials on our website guide the user through potential query and analysis tasks. The most important parts of the user interface are the Query, Information, and Interaction Panels (<xref ref-type="fig" rid="F2">Figure 2</xref>). DASMIweb requires a JavaScript-enabled browser for a technology known as Asynchronous JavaScript and XML (AJAX). The AJAX functionality, provided by the Direct Web Remoting framework (<ext-link ext-link-type="uri" xlink:href="http://getahead.org/dwr/">http://getahead.org/dwr/</ext-link>), compensates for different data source response times and allows for presenting interaction results to the user as soon as DASMIweb receives them. DASMIweb stores all data associated with a user request in sessions. This means that all interactions, interaction details, confidence scores and all DASMIweb configurations are maintained for half an hour even if the user temporarily leaves our website.
<fig id="F2" position="float"><label>Figure 2.</label><caption><p>DASMIweb user interface. The screen is separated into the top left Query Panel, the top right Information Panel and the central Interaction Panel. Interactions are presented in tabular form: each column represents a data source, each row contains interaction partner(s), and each square at the intersection of a row and a column indicates a particular interaction. The Gene Ontology-based confidence measure FunSimMat-BPscore is selected, and the interaction squares are colored with a white-to-blue gradient: white for no functional similarity and dark blue for complete similarity.</p></caption><graphic xlink:href="gkp438f2"></graphic></fig></p><sec><title>Querying</title><p>The Query Panel in the top left corner of the screen only contains a single search field to allow the user straightforward querying. The user does not need to specify the input type; DASMIweb tries to determine it automatically. If the identifier type cannot be resolved unambiguously, the user is asked to refine the query. As detailed above, DASMIweb will not only include all data sources with the same identifier system of the query, but also attempt mapping the query identifier to all compatible identifier systems to include additional sources. DASMIweb converts only between protein (e.g. UniProtKB or RefSeq) and gene (e.g. Entrez Gene) identifier systems, which does not include domain identifier systems like Pfam. All data sources for which a suitable identifier is found will subsequently be queried for interactions.</p></sec><sec><title>Result presentation</title><p>Information on the query interactor, such as names, synonyms, or external database references, is provided in the Information Panel located in the top right corner of the screen. Interaction results are presented to the user in a table within the central Interaction Panel: table columns represent data sources that have been queried for interactions, rows contain interaction partners (single partners for binary interactions and all partners for protein complexes), and squares in the intersections of rows and columns indicate particular interactions (<xref ref-type="fig" rid="F2">Figure 2</xref>). Different background colors for each data source in the table header highlight the corresponding interaction determination methods (<xref ref-type="table" rid="T1">Table 1</xref>): green represents sources with data derived from experimental studies or curation of the scientific literature, yellow represents computational predictions. The interaction table is built gradually, and new rows and interaction squares are inserted as soon as results have been retrieved from the data sources. In addition, the interactions can be sorted according to individual table columns or by their frequency of occurrence in all data sources. For the sake of clarity, a tabbed display only shows a user-definable number of interactions per page (initially set to 50); arrows allow for browsing through additional results. Display options like sorting and tabbed browsing can be configured in the myDASMI Panel, which can be opened by clicking on the correspondent box in the middle of the right screen border.</p><p>Our tabular representation supports a quick visual assessment of the results, based on the assumption that interactions that are reported in several datasets are more likely to be accurate. To further investigate particular interactions, the user can click on an interaction square and request the display of a new table row with additional information on an interaction and the interaction partner(s). For example, the additional information may include links to the original publication that reported the interaction, information on the experimental settings or conditions, a web link to the full entry in the source database or external database identifiers for the interaction partner(s). The amount of details given in the additional information is primarily defined by the data source providers that reports the respective interaction and not by DASMIweb.</p></sec><sec><title>Data source configuration</title><p>DASMIweb maintains a list of all publicly available interaction sources (<xref ref-type="table" rid="T1">Table 1</xref>) in the Source Configuration Panel, which can be opened by pressing the corresponding button in the Query Panel. The sources are grouped according to their identifier system, and basic information like the name, source type, and a description are provided for each entry. As described above, green and yellow background colors indicate different interaction determination methods. A blue background represents data sources useful for interaction confidence scoring. Initially, all data sources are active and will be used for answering queries. The user can deactivate data sources by removing the leading checkmark of the respective entry.</p><p>We currently support three approaches for including new data sources in DASMIweb. First, all data sources registered at the central DAS registry (<ext-link ext-link-type="uri" xlink:href="http://www.dasregistry.org">http://www.dasregistry.org</ext-link>) will be available automatically to the DASMIweb users. The second option is the local registration of a data source by providing information like its name, URL, and identifier system. The third option is uploading a PSI-MI XML2.5 file (<xref ref-type="bibr" rid="B34">34</xref>) to DASMIweb and temporarily creating a data source from its content. The first two options require that the data source to be added is already set up and accessible over the Internet. In contrast, the third option allows for comparing own interactions with existing datasets or for assessing them by different confidence scoring servers. Another distinction can be made with respect to data privacy: data sources added with the first approach are accessible to all DASMIweb users, while the second and third approaches affect only the respective user session.</p></sec><sec><title>Interaction confidence scoring</title><p>Despite improved methods for generating protein interaction data (<xref ref-type="bibr" rid="B35">35</xref>), current interactomes are still incomplete to a large extent and doubts about the reliability of detection methods remain (<xref ref-type="bibr" rid="B2">2</xref>,<xref ref-type="bibr" rid="B4">4</xref>,<xref ref-type="bibr" rid="B5">5</xref>). Quality assessment is crucial not only for interactions determined by large-scale experimental assays, but also for those curated from scientific literature or obtained by computational prediction methods. Therefore, DASMIweb provides access to specialized data sources (<xref ref-type="table" rid="T1">Table 1</xref>) and, at the same time, supports the convenient evaluation of the quality of individual protein interactions.</p><p>As the distributed retrieval of confidence scores for a large number of interactions can be computationally demanding, it has to be explicitly requested by pressing a button in the header of the interaction table. After retrieval, the different scoring methods can be selected in a drop-down menu next to the same button. This menu also lists all original confidence scores provided by the authors of a source dataset. A brief description of the selected scoring method can be found in the bottom right corner of the screen. Confidence scores are printed atop the interaction squares and are also available as new interaction details. If the scores of a method can be normalized to a range between zero and one, they will additionally be color-coded by a white-to-blue gradient into the respective interaction squares, white for the value zero, dark blue for the value one (<xref ref-type="fig" rid="F2">Figure 2</xref>).</p></sec><sec><title>Exporting results</title><p>Interaction results can be exported in different file formats, enabling the user to analyze the retrieved data further in other applications. Currently, we support the Simple Interaction Format (SIF), defined by the network analysis and visualization program Cytoscape (<xref ref-type="bibr" rid="B36">36</xref>), and the tabular MITAB2.5 format as specified by HUPO-PSI (<xref ref-type="bibr" rid="B34">34</xref>).</p></sec></sec><sec sec-type="conclusions"><title>CONCLUSIONS</title><p>We presented our new web server DASMIweb that supports the online integration, analysis and assessment of distributed sets of molecular interaction data in a dynamic and user-configurable fashion. DASMIweb provides access to over thirty different interaction and confidence scoring resources, which constitutes one of the largest amounts of protein and domain interaction data available through one web interface. In particular, DASMIweb can be used to assess the quality of arbitrary user-defined sets of protein interactions with different confidence scoring methods. Due to the decentralized architecture, users can easily extend DASMIweb by adding further data sources. Additional data sources for providing protein interactions and confidence scoring methods are already expected to be made available within DASMIweb by different external sites in the near future. Furthermore, additional DASMIweb features are currently under development, ranging from support for full-text searches and batch queries for multiple interactors to additional data import and export formats.</p></sec></body><back><ack><title>ACKNOWLEDGEMENTS</title><p>We are grateful to Dorothea Emig and Sven-Eric Schelhorn for providing several domain interaction datasets and to Andreas Schlicker for his help with the functional similarity scoring servers. We also thank Robert Finn, Andrew Jenkinson, Andreas Prlić and Jonathan Warren for maintaining parts of the DAS infrastructure. In particular, we greatly appreciate the time and work of external providers of interaction data sources because a distributed system can only be successful with broad community support.</p></ack><sec><title>FUNDING</title><p>German National Genome Research Network (NGFN) and the German Research Foundation (DFG), contract number KFO 129/1-2. The work was conducted in the context of the DFG-funded Cluster of Excellence for Multimodal Computing and Interaction as well as of the BioSapiens Network of Excellence funded by the European Commission under grant number LSHG-CT-2003-503265. Funding for open access charge: Max Planck Society.</p><p><italic>Conflict of interest statement</italic>. 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| This area was generated with Dilib version V0.6.25. |  |