SpliceMiner: a high-throughput database implementation of the NCBI Evidence Viewer for microarray splice variant analysis
- Ari B Kahn†1, 2,
- Michael C Ryan†1, 2, 3,
- Hongfang Liu2, 4,
- Barry R Zeeberg2,
- D Curtis Jamison1, 5 and
- John N Weinstein2Email author
© Kahn et al; licensee BioMed Central Ltd. 2007
Received: 03 October 2006
Accepted: 05 March 2007
Published: 05 March 2007
There are many fewer genes in the human genome than there are expressed transcripts. Alternative splicing is the reason. Alternatively spliced transcripts are often specific to tissue type, developmental stage, environmental condition, or disease state. Accurate analysis of microarray expression data and design of new arrays for alternative splicing require assessment of probes at the sequence and exon levels.
SpliceMiner is a web interface for querying Evidence Viewer Database (EVDB). EVDB is a comprehensive, non-redundant compendium of splice variant data for human genes. We constructed EVDB as a queryable implementation of the NCBI Evidence Viewer (EV). EVDB is based on data obtained from NCBI Entrez Gene and EV. The automated EVDB build process uses only complete coding sequences, which may or may not include partial or complete 5' and 3' UTRs, and filters redundant splice variants. Unlike EV, which supports only one-at-a-time queries, SpliceMiner supports high-throughput batch queries and provides results in an easily parsable format. SpliceMiner maps probes to splice variants, effectively delineating the variants identified by a probe.
EVDB can be queried by gene symbol, genomic coordinates, or probe sequence via a user-friendly web-based tool we call SpliceMiner (http://discover.nci.nih.gov/spliceminer). The EVDB/SpliceMiner combination provides an interface with human splice variant information and, going beyond the very valuable NCBI Evidence Viewer, supports fluent, high-throughput analysis. Integration of EVDB information into microarray analysis and design pipelines has the potential to improve the analysis and bioinformatic interpretation of gene expression data, for both batch and interactive processing. For example, whenever a gene expression value is recognized as important or appears anomalous in a microarray experiment, the interactive mode of SpliceMiner can be used quickly and easily to check for possible splice variant issues.
There is a substantial difference between the number of genes in the human genome and the number of expressed transcripts and proteins. Alternative splicing largely accounts for that discrepancy. Based on experimental evidence and computational approaches (e.g. realignments of transcripts or hidden Markov models), the percentage of genes that exhibit alternative splicing has been estimated as anywhere from 30% to 99% [1, 2]. Numerous reviews describe general aspects of alternative splicing [3–11], mechanisms of alternative splicing [12, 13], and the roles played by alternative splicing in particular biological processes and diseases [14–24].
Until recently, microarray analysis has frequently assumed that transcript expression could be understood on the basis of gene-level information. However, splice variation is functionally important, and it can impact hybridization (e.g., to microarrays). A probe may, for example, target a sequence that is absent from a particular variant; that situation may lead to under-estimation of gene expression. Most existing traditional microarray platforms do not explicitly and systematically account for alternative splicing. Ideally, microarrays would include probes for each exon and splice site of each target gene to permit analysis of expressed splice forms.
Once a microarray has been manufactured, we cannot go back and change the design, but we can improve the analysis and interpretation of the results obtained from it. Furthermore, the annotation of newer microarrays designed to take alternative splicing into account will become inaccurate and obsolete as more information is deposited in the major genomic data repositories. Hence, the annotations must be updated on a regular basis. For those reasons, we require a database of all known splice variants and their exons. However, none of the published splice variant databases [25–46] permit explicit identification of microarray probes that distinguish splice variants. See Additional file 4 for a review of alternative splicing.
For that reason, we have developed (i) Evidence Viewer Database (EVDB), which provides a comprehensive, non-redundant collection of known human alternative splice forms, and (ii) SpliceMiner, a user-friendly tool for interactive and batch querying of EVDB. We constructed EVDB on the basis of data in the National Center for Biotechnology Information (NCBI) Entrez Gene  and NCBI Evidence Viewer (EV) . EVDB maps gene symbols to a set of unique splice variants and identifies the exons present in each variant, along with transcript and genomic coordinates for each exon. SpliceMiner can be used to query EVDB by gene symbol, genomic coordinates, or probe sequence. Support for both interactive and batch queries is provided, and the SpliceMiner website provides high-throughput query functions that make it possible to integrate splice variant information into microarray analysis and design pipelines.
We will first describe EVDB in some detail and then present SpliceMiner. Further important information on the implementation of EVDB and SpliceMiner is included in Additional file 1 and Additional file 2, respectively.
EVDB construction and contents
EVDB is a relational database that describes all known splice variants of human genes for which GenBank [49, 50] contains complete coding sequences. We constructed it on the basis of data in the NCBI Evidence Viewer (EV) and NCBI Gene but also used information from NCBI MapViewer , GenBank, RefSeq , Human Gene Nomenclature Committee (HGNC) gene symbols , and Enhanced Gene Ontology Database (EGOD) . EVDB contains gene symbols, unique splice variants identified by accession ID, the exon composition of each variant, and both the genomic and transcript coordinates of each exon (Figure S1 in Additional file 3).
A goal of the project was to develop a splice variant database that conforms to a defined standard. NCBI Gene is a recognized standard for all gene-related data, is exhaustive with respect to known complete coding sequences, and is integrated with many other NCBI and non-NCBI data sources. EV, accessible through NCBI Gene, contains a number of different, useful types of information about a gene: the gene model, multiple sequence alignments, all RefSeq models, GenBank mRNAs, known or potential annotated transcripts, and ESTs . We constructed EVDB primarily by converting the information in EV into a batch-queryable form. Currently, EVDB uses CDDSs to produce a non-redundant data set, but we are planning to include ESTs in a later release.
EVDB contains splice variant and exon coordinate data that are supported by complete transcript coding sequences. Genes that are predicted or based on EST evidence are represented in EVDB but without splice variant or exon coordinate data. The build of EVDB current at the time of publication of this paper (based on Human Genome Build 35.1) contains splice variant and exon composition data for 16,895 genes. As new builds of the human genome are released and additional complete coding evidence is produced, the number of genes in EVDB with splice variant and exon coordinate data will increase to match more closely the number of gene symbols in NCBI Gene.
The EVDB build process
After the parallel data-gathering streams have finished, a single merged-stream process creates two additional tables (complete_cds and complete_cds_chrom). To identify complete coding and RefSeq accession IDs, tables evv and complcds_bgacc are joined by accession ID to produce table complete_cds. Absolute chromosomal coordinates are assigned to each exon by joining tables hs_esttrn and compete_cds by contig, accession ID, and transcript coordinates to produce table complete_cds_chrom. Table complete_cds_chrom contains all of the data necessary to deduce splice variants.
In the current EVDB build, approximately 685 accession IDs map to multiple gene symbols. Those multiple mappings arise when there are alternative promoters for the same transcript. Since we are interested in the mapping of probes to splice variants, assignment of accession IDs to multiple gene symbols is a confounding factor. A gene-symbol collapsing algorithm removes that form of redundancy. Transcripts in multiple gene records are pooled into one non-redundant record when the algorithm finds at least one accession ID in common between genes. EGOD symbols were chosen over HGNC symbols because we plan to integrate EVDB with GoMiner [56, 57] analysis, and GoMiner queries EGOD ; otherwise, HGNC symbols are chosen in preference to non-HGNC symbols.
Many gene symbols have more than one accession ID for a transcript. EVDB is intended to be a non-redundant database of splice variants, so repeated records with duplicate gene structure are filtered. An algorithm for filtering replicate accession IDs compares the chromosomal coordinates of each exon for all transcripts of a given gene symbol. Transcripts with identical exon coordinates are filtered. RefSeq accession IDs were chosen over redundant GenBank accession IDs.
Not all genes are represented in EV. We will refer to those genes as "MIAs." Many MIAs are not reviewed, are not validated, or are simply predicted but not experimentally verified. The EVDB build process includes a step that loads MIA symbols into EVDB. MIAs are included for completeness but lack gene structure information. As the data become available, MIAs will eventually be annotated and added to EV.
General algorithms and a more detailed description of the EVDB build process are provided in Additional file 1. Algorithms for naming exons, sub-exons, and splice variants (see Figure 1) are beyond the scope of the present work, but, in brief, the build process uses a novel naming convention that accommodates discovery of new splice forms and exon structures without the renaming of previously described exons (Kahn et al., in preparation). That naming convention, which identifies splice variants uniquely, is intended to facilitate integration of splicing information into other software tools and processes.
Versioning and data asynchrony
Using the latest build of EVDB is not the best strategy for all research projects. Experimental results and software development may be based on a particular version of EVDB. Therefore, all entries in all tables are versioned for minor updates, and separate databases are implemented for each new build of the Human Genome. Methods for querying older versions of EVDB through the Web API will be provided.
EVDB construction and quality control
EVDB was constructed using in-house Perl (Version 5.8.6) programs and PostgreSQL (Version 8.1). The Perl programs are modularly coded for each processing stream. Each subroutine in a module contains test subroutines and test data. Data and database integrity checks are also implemented.
Contents of EVDB
The contents of EVDB are summarized in figures and tables in Additional file 3.
SpliceMiner system architecture
SpliceMiner is a web interface/tool for querying EVDB. To facilitate deployment and support, we developed it on a platform consistent with existing NCI web-based systems. The system was constructed using open source tools that do not require license fees for production deployment. The technical details of the system architecture and implementation, and a schematic of the primary system components is displayed in Figure 1 of Additional file 2.
Utility and discussion
Batch-request files can be pasted into the SpliceMiner text area or uploaded in text or zip file form. Small batch requests are processed immediately; larger batch requests are processed asynchronously, and the user is notified of completion via an email message containing a link to the results. Batch query results are presented in tabular form to support automated processing. A tab-delimited flat file is automatically generated and downloaded via a hyperlink in the email message (for large queries) or directly via a 'save-to-file' in the web browser (for small queries). Each line indicates the query string, gene, variant (identified by accession ID), exon, and both genomic and transcript coordinates. For gene queries, all variants and their exons are returned. For sequence or genomic coordinate queries, only the gene, variant, and exon combinations that are an exact match to the query are returned. For example, if the search sequence matches exon 4 of gene ACP1, only those variants containing exon 4 will be returned. A single large data file can be submitted to retrieve all splice variant data for a microarray in a single request, or a program can request splice variant data one probe or gene at a time.
Use of SpliceMiner
The intent of SpliceMiner is to provide access to non-redundant splice variant and genomic data in EVDB, particularly for microarray research. Microarray design can be improved by augmenting probe placement decisions with knowledge of splice variant composition and exon structure. Similarly, analysis of microarray data from existing platforms can be improved by understanding the exon locations of the probes. The genomic positions of oligonucleotide probes may support inferences about the expression levels of specific splice variants. SpliceMiner queries can be integrated into microarray pipelines to add splice variant information.
The SpliceMiner web interface has been designed to facilitate integration with a variety of microarray pipelines. Pipelines that process large batch files as well as those that perform iterative gene by gene processing are supported. Integration with a batch processing pipeline is accomplished by submitting a single batch query file to SpliceMiner with a query line for each probe sequence or locus. Integration with an iterative process pipeline (e.g., microarray probe design) is accomplished by automating the query for a single sequence, symbol, or locus.
The sample Perl program (given in the FAQ section of the SpliceMiner web site at  or downloadable from ) illustrates one method for integrating SpliceMiner into a genomic pipeline. The LWP module is used to submit a web request to SpliceMiner for a gene symbol, genomic coordinate, or probe sequence query. The tab-delimited results are easily parsed with the Perl "split" function.
Whether variants have no probes;
Situations in which it is possible to evaluate probe-level signal to infer which variants are being expressed; and
Situations in which the probes in a probe set are likely to report differing signal values depending on the expression levels of different splice variants and the positions of the probes. If only a few probes related to one transcript are reporting signal, many analysis programs (e.g. MAS5) register an "Absent" score for the whole gene, and information about that gene's expression is lost.
Probe definitions are not used in the report because sequence data for the human genome continue to be refined, and probe sequences on older chips often no longer match their intended target gene. For that reason, sequence queries are performed by aligning  probes to a database of transcripts available in EVDB.
The Splice Variant/Exon Coverage Report demonstrates one of the benefits of applying SpliceMiner to microarray analysis. The report indicates the probes that can be used to estimate the expression of a specific splice variant. The report also flags potential problems that may lead to inaccurate gene-level expression values:
inability to detect a splice variant
∘ none of the probes in the gene's probe set target any exons in that splice variant.
∘ e.g., occurs for 28% of the multi-variant genes represented on the Affymetrix HU_U95Av2 microarray.
inconsistent detection of splice variants
∘ some probes in the gene's probe set target an exon that is missing in some of the splice variants (e.g., any of the probes in Figure 3).
∘ the downstream analysis algorithms (e.g., RMA or MAS5) assume that all of the probes in a gene's probe set target a consistent set of exons, but the input to the algorithms will violate this basic assumption.
∘ e.g., occurs for 42% of the multi-variant genes represented on the Affymetrix HU_U95Av2 microarray.
give a summary, listed by gene symbol, describing those exons for which there is a probe and showing both the chromosomal and transcript coordinates where probes match each splice variant of the gene;
identify genes for which there is a probe that uniquely discriminates a splice variant; and
identify genes for which there is no probe for some or all splice variants.
A detailed description of the implementation of the web interface and related tools is provided in Additional file 2.
SpliceMiner provides genomic researchers with access to EVDB, a source of non-redundant splice variant data that we designed for high-throughput analysis. Unlike NCBI's valuable Evidence Viewer, EVDB supports batch queries and queries across multiple genes. Because of its high-throughput capabilities, SpliceMiner is particularly useful for design and analysis of microarrays. SpliceMiner maps probes to splice variants, effectively delineating the variants identified by a probe. The addition of SpliceMiner to microarray pipelines provides a method for improving the accuracy of microarray results through inclusion of splice variant and exon composition data.
Availability and requirements
The SpliceMiner website is available online at http://discover.nci.nih.gov/spliceminer. SpliceMiner and EVDB data and results are made freely available to government, academic, and commercial users.
This research was supported in part by the Intramural Research Program of the NIH, National Cancer Institute, Center for Cancer Research. We would like to thank Donna Maglott (NCBI, Bethesda MD) for directing us to the appropriate NCBI resources, and James A. Cleland (Tiger Team Consulting, Fairfax VA) for contributing an enhanced version of the original visualization of the interactive query results.
- Lee C, Roy M: Analysis of alternative splicing with microarrays: successes and challenges. Genome Biol 2004, 5(7):231. 10.1186/gb-2004-5-7-231PubMed CentralView ArticlePubMedGoogle Scholar
- Boue S, Letunic I, Bork P: Alternative splicing and evolution. Bioessays 2003, 25(11):1031–1034. 10.1002/bies.10371View ArticlePubMedGoogle Scholar
- Breitbart RE, Andreadis A, Nadal-Ginard B: Alternative splicing: a ubiquitous mechanism for the generation of multiple protein isoforms from single genes. Annu Rev Biochem 1987, 56: 467–495. 10.1146/annurev.bi.56.070187.002343View ArticlePubMedGoogle Scholar
- Modrek B, Lee C: A genomic view of alternative splicing. Nat Genet 2002, 30(1):13–19. 10.1038/ng0102-13View ArticlePubMedGoogle Scholar
- Black DL: Protein diversity from alternative splicing: a challenge for bioinformatics and post-genome biology. Cell 2000, 103(3):367–370. 10.1016/S0092-8674(00)00128-8View ArticlePubMedGoogle Scholar
- Graveley BR: Alternative splicing: increasing diversity in the proteomic world. Trends Genet 2001, 17(2):100–107. 10.1016/S0168-9525(00)02176-4View ArticlePubMedGoogle Scholar
- Ast G: How did alternative splicing evolve? Nat Rev Genet 2004, 5(10):773–782. 10.1038/nrg1451View ArticlePubMedGoogle Scholar
- Sorek R, Shamir R, Ast G: How prevalent is functional alternative splicing in the human genome? Trends Genet 2004, 20(2):68–71. 10.1016/j.tig.2003.12.004View ArticlePubMedGoogle Scholar
- Cartegni L, Chew SL, Krainer AR: Listening to silence and understanding nonsense: exonic mutations that affect splicing. Nat Rev Genet 2002, 3(4):285–298. 10.1038/nrg775View ArticlePubMedGoogle Scholar
- Hastings ML, Krainer AR: Pre-mRNA splicing in the new millennium. Curr Opin Cell Biol 2001, 13(3):302–309. 10.1016/S0955-0674(00)00212-XView ArticlePubMedGoogle Scholar
- Horowitz DS, Krainer AR: Mechanisms for selecting 5' splice sites in mammalian pre-mRNA splicing. Trends Genet 1994, 10(3):100–106. 10.1016/0168-9525(94)90233-XView ArticlePubMedGoogle Scholar
- Smith CW, Patton JG, Nadal-Ginard B: Alternative splicing in the control of gene expression. Annu Rev Genet 1989, 23: 527–577. 10.1146/annurev.ge.23.120189.002523View ArticlePubMedGoogle Scholar
- Black DL: Mechanisms of alternative pre-messenger RNA splicing. Annu Rev Biochem 2003, 72: 291–336. 10.1146/annurev.biochem.72.121801.161720View ArticlePubMedGoogle Scholar
- Garcia-Blanco MA, Baraniak AP, Lasda EL: Alternative splicing in disease and therapy. Nat Biotechnol 2004, 22(5):535–546. 10.1038/nbt964View ArticlePubMedGoogle Scholar
- Grabowski PJ, Black DL: Alternative RNA splicing in the nervous system. Prog Neurobiol 2001, 65(3):289–308. 10.1016/S0301-0082(01)00007-7View ArticlePubMedGoogle Scholar
- Xu Q, Modrek B, Lee C: Genome-wide detection of tissue-specific alternative splicing in the human transcriptome. Nucleic Acids Res 2002, 30(17):3754–3766. 10.1093/nar/gkf492PubMed CentralView ArticlePubMedGoogle Scholar
- Black DL: Splicing in the inner ear: a familiar tune, but what are the instruments? Neuron 1998, 20(2):165–168. 10.1016/S0896-6273(00)80444-4View ArticlePubMedGoogle Scholar
- Burgess RW, Nguyen QT, Son YJ, Lichtman JW, Sanes JR: Alternatively spliced isoforms of nerve- and muscle-derived agrin: their roles at the neuromuscular junction. Neuron 1999, 23(1):33–44. 10.1016/S0896-6273(00)80751-5View ArticlePubMedGoogle Scholar
- Cooper TA, Mattox W: The regulation of splice-site selection, and its role in human disease. Am J Hum Genet 1997, 61(2):259–266.PubMed CentralView ArticlePubMedGoogle Scholar
- Jiang ZH, Wu JY: Alternative splicing and programmed cell death. Proc Soc Exp Biol Med 1999, 220(2):64–72. 10.1046/j.1525-1373.1999.d01-11.xView ArticlePubMedGoogle Scholar
- Schutt C, Nothiger R: Structure, function and evolution of sex-determining systems in Dipteran insects. Development 2000, 127(4):667–677.PubMedGoogle Scholar
- Caceres JF, Kornblihtt AR: Alternative splicing: multiple control mechanisms and involvement in human disease. Trends Genet 2002, 18(4):186–193. 10.1016/S0168-9525(01)02626-9View ArticlePubMedGoogle Scholar
- Blencowe BJ: Exonic splicing enhancers: mechanism of action, diversity and role in human genetic diseases. Trends Biochem Sci 2000, 25(3):106–110. 10.1016/S0968-0004(00)01549-8View ArticlePubMedGoogle Scholar
- Black DL, Grabowski PJ: Alternative pre-mRNA splicing and neuronal function. Prog Mol Subcell Biol 2003, 31: 187–216.View ArticlePubMedGoogle Scholar
- de la Grange P, Dutertre M, Martin N, Auboeuf D: FAST DB: a website resource for the study of the expression regulation of human gene products. Nucleic Acids Res 2005, 33(13):4276–4284. 10.1093/nar/gki738PubMed CentralView ArticlePubMedGoogle Scholar
- Dralyuk I, Brudno M, Gelfand MS, Zorn M, Dubchak I: ASDB: database of alternatively spliced genes. Nucleic Acids Res 2000, 28(1):296–297. 10.1093/nar/28.1.296PubMed CentralView ArticlePubMedGoogle Scholar
- Fujii Y, Imanishi T, Gojobori T: [H-Invitational Database: integrated database of human genes]. Tanpakushitsu Kakusan Koso 2004, 49(11 Suppl):1937–1943.PubMedGoogle Scholar
- Gelfand MS, Dubchak I, Dralyuk I, Zorn M: ASDB: database of alternatively spliced genes. Nucleic Acids Res 1999, 27(1):301–302. 10.1093/nar/27.1.301PubMed CentralView ArticlePubMedGoogle Scholar
- Gopalan V, Tan TW, Lee BT, Ranganathan S: Xpro: database of eukaryotic protein-encoding genes. Nucleic Acids Res 2004, 32(Database issue):D59–63. 10.1093/nar/gkh051PubMed CentralView ArticlePubMedGoogle Scholar
- Gupta S, Zink D, Korn B, Vingron M, Haas SA: Genome wide identification and classification of alternative splicing based on EST data. Bioinformatics 2004, 20(16):2579–2585. 10.1093/bioinformatics/bth288View ArticlePubMedGoogle Scholar
- Huang HD, Horng JT, Lin FM, Chang YC, Huang CC: SpliceInfo: an information repository for mRNA alternative splicing in human genome. Nucleic Acids Res 2005, 33(Database issue):D80–5. 10.1093/nar/gki129PubMed CentralView ArticlePubMedGoogle Scholar
- Kim N, Shin S, Lee S: ECgene: genome-based EST clustering and gene modeling for alternative splicing. Genome Res 2005, 15(4):566–576. 10.1101/gr.3030405PubMed CentralView ArticlePubMedGoogle Scholar
- Kim P, Kim N, Lee Y, Kim B, Shin Y, Lee S: ECgene: genome annotation for alternative splicing. Nucleic Acids Res 2005, 33(Database issue):D75–9. 10.1093/nar/gki118PubMed CentralView ArticlePubMedGoogle Scholar
- Lee C, Atanelov L, Modrek B, Xing Y: ASAP: the Alternative Splicing Annotation Project. Nucleic Acids Res 2003, 31(1):101–105. 10.1093/nar/gkg029PubMed CentralView ArticlePubMedGoogle Scholar
- Modrek B, Resch A, Grasso C, Lee C: Genome-wide detection of alternative splicing in expressed sequences of human genes. Nucleic Acids Res 2001, 29(13):2850–2859. 10.1093/nar/29.13.2850PubMed CentralView ArticlePubMedGoogle Scholar
- Nagasaki H: ASTRA (Alternative Splicing and TRanscription Archives) .[http://alterna.cbrc.jp/index.php]
- Pollastro P: HS3D, A Data Set of Homo Sapiens Splice Regions, and Its Extraction Procedure from a Major Public Database. International Journal of Modern Physics C 2002., 13(8):
- Pospisil H, Herrmann A, Bortfeldt RH, Reich JG: EASED: Extended Alternatively Spliced EST Database. Nucleic Acids Res 2004, 32(Database issue):D70–4. 10.1093/nar/gkh136PubMed CentralView ArticlePubMedGoogle Scholar
- Sakharkar M, Long M, Tan TW, de Souza SJ: ExInt: an Exon/Intron database. Nucleic Acids Res 2000, 28(1):191–192. 10.1093/nar/28.1.191PubMed CentralView ArticlePubMedGoogle Scholar
- Sakharkar M, Passetti F, de Souza JE, Long M, de Souza SJ: ExInt: an Exon Intron Database. Nucleic Acids Res 2002, 30(1):191–194. 10.1093/nar/30.1.191PubMed CentralView ArticlePubMedGoogle Scholar
- Sakharkar MK, Perumal BS, Lim YP, Chern LP, Yu Y, Kangueane P: Alternatively spliced human genes by exon skipping--a database (ASHESdb). In Silico Biol 2005, 5(3):221–225.PubMedGoogle Scholar
- Thanaraj TA, Stamm S, Clark F, Riethoven JJ, Le Texier V, Muilu J: ASD: the Alternative Splicing Database. Nucleic Acids Res 2004, 32(Database issue):D64–9. 10.1093/nar/gkh030PubMed CentralView ArticlePubMedGoogle Scholar
- Zheng CL, Kwon YS, Li HR, Zhang K, Coutinho-Mansfield G, Yang C, Nair TM, Gribskov M, Fu XD: MAASE: an alternative splicing database designed for supporting splicing microarray applications. Rna 2005, 11(12):1767–1776. 10.1261/rna.2650905PubMed CentralView ArticlePubMedGoogle Scholar
- Stamm S, Riethoven JJ, Le Texier V, Gopalakrishnan C, Kumanduri V, Tang Y, Barbosa-Morais NL, Thanaraj TA: ASD: a bioinformatics resource on alternative splicing. Nucleic Acids Res 2006, 34(Database issue):D46–55. 10.1093/nar/gkj031PubMed CentralView ArticlePubMedGoogle Scholar
- Holste D, Huo G, Tung V, Burge CB: HOLLYWOOD: a comparative relational database of alternative splicing. Nucleic Acids Res 2006, 34(Database issue):D56–62. 10.1093/nar/gkj048PubMed CentralView ArticlePubMedGoogle Scholar
- Nurtdinov RN, Neverov AD, Mal'ko DB, Kosmodem'ianskii IA, Ermakova EO, Ramenskii VE, Mironov AA, Gel'fand MS: [EDAS, databases of alternatively spliced human genes]. Biofizika 2006, 51(4):589–592.PubMedGoogle Scholar
- Maglott D, Ostell J, Pruitt KD, Tatusova T: Entrez Gene: gene-centered information at NCBI. Nucleic Acids Res 2005, 33(Database issue):D54–8. 10.1093/nar/gki031PubMed CentralView ArticlePubMedGoogle Scholar
- NCBI Evidence Viewer[http://www.ncbi.nlm.nih.gov/sutils/static/evvdoc.html]
- Benson DA, Karsch-Mizrachi I, Lipman DJ, Ostell J, Wheeler DL: GenBank. Nucleic Acids Res 2006, 34(Database issue):D16–20. 10.1093/nar/gkj157PubMed CentralView ArticlePubMedGoogle Scholar
- Benson DA, Karsch-Mizrachi I, Lipman DJ, Ostell J, Wheeler DL: GenBank. Nucleic Acids Res 2005, 33(Database issue):D34–8. 10.1093/nar/gki063PubMed CentralView ArticlePubMedGoogle Scholar
- NCBI Map Viewer[http://www.ncbi.nlm.nih.gov/mapview/]
- Pruitt KD, Tatusova T, Maglott DR: NCBI Reference Sequence (RefSeq): a curated non-redundant sequence database of genomes, transcripts and proteins. Nucleic Acids Res 2005, 33(Database issue):D501–4. 10.1093/nar/gki025PubMed CentralView ArticlePubMedGoogle Scholar
- Wain HM, Lush MJ, Ducluzeau F, Khodiyar VK, Povey S: Genew: the Human Gene Nomenclature Database, 2004 updates. Nucleic Acids Res 2004, 32(Database issue):D255–7. 10.1093/nar/gkh072PubMed CentralView ArticlePubMedGoogle Scholar
- Roy M, Xu Q, Lee C: Evidence that public database records for many cancer-associated genes reflect a splice form found in tumors and lack normal splice forms. Nucleic Acids Res 2005, 33(16):5026–5033. 10.1093/nar/gki792PubMed CentralView ArticlePubMedGoogle Scholar
- Evidence Viewer Documentation[http://www.ncbi.nlm.nih.gov/sutils/static/evvdoc.html]
- Zeeberg BR, Feng W, Wang G, Wang MD, Fojo AT, Sunshine M, Narasimhan S, Kane DW, Reinhold WC, Lababidi S: GoMiner: a resource for biological interpretation of genomic and proteomic data. Genome Biol 2003, 4: R28. 10.1186/gb-2003-4-4-r28PubMed CentralView ArticlePubMedGoogle Scholar
- Zeeberg BR, Qin H, Narasimhan S, Sunshine M, Cao H, Kane DW, Reimers M, Stephens RM, Bryant D, Burt SK, Elnekave E, Hari DM, Wynn TA, Cunningham-Rundles C, Stewart DM, Nelson D, Weinstein JN: High-Throughput GoMiner, an 'industrial-strength' integrative gene ontology tool for interpretation of multiple-microarray experiments, with application to studies of Common Variable Immune Deficiency (CVID). BMC Bioinformatics 2005, 6: 168. 10.1186/1471-2105-6-168PubMed CentralView ArticlePubMedGoogle Scholar
- SpliceMiner FAQ[http://discover.nci.nih.gov/spliceminer/faq.jsp]
- Sample Perl program illustrating one method for integrating SpliceMiner into a genomic pipeline[http://discover.nci.nih.gov/spliceminer/evdbsamp.zip]
- Kent WJ: BLAT--the BLAST-like alignment tool. Genome Res 2002, 12(4):656–664. 10.1101/gr.229202. Article published online before March 2002PubMed CentralView ArticlePubMedGoogle Scholar
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