Table 1

Public circRNA databases

Namecirc2Traits10nc2Cancer11circBase12starBase v2.013CircNet14deepBase v2.015CircInteractome16
Websitehttp://gyanxet-beta.com/circdb/http://www.bioinfo.tsinghua.edu.cn/nc2Cancerhttp://www.circbase.org/http://starbase.sysu.edu.cnhttp://circnet.mbc.nctu.edu.tw/http://biocenter.sysu.edu.cn/deepBase/http://circinteractome.nia.nih.gov
CircRNA disease association105 Diseases31 CancersNot availableNot availableNot availableNot availableNot available
CircRNA annotation1953 Human circRNAs172 Human circRNAsNot availableNot available212 950 CircRNAs14 867 Human circRNAsNot available
Sequence alignmentNot availableNot availableA web interface of BLASTNot availableA web interface of BLASTNot availableNot available
CircRNA reference sourcecircRNA dataset from Memczak et al1miR2Disease, miRCancer, HMDD v2.0 and starBaseBack-spliced junction sites in animals reported in 2013 and 2015circBase v0.1Reported human circRNAs from 2013 to 2015NCBI GEO and SRA databasesCircBase, starBase V.2.0, miRBase,17 IRESite18
CircRNA position on genomeA customised genome browserNot availableLinked out to UCSC Genome BrowserA customised genome browser accessible through keyword searchAn integrated genome browser synchronising with the network graphical user interfaceA customised genome browserLinked out to UCSC genome browser
CircRNA sample sourceNot availableNot availableThe samples where the back-spliced junction sites were discoveredcircBase v0.1 source samples1. In which sample junction sites were discovered. 2. Expression level in available samples. 3. Clustered sample conditionsNot availableNot available
CircRNA namingA serial number for every detected back-spliced junction siteA serial number for every detected back-spliced junction siteA serial number for every detected back-spliced junction siteSame as circBase, except CDR1 antisense (CDR1as)A systematic naming system which provides information to the source gene and annotated exons of circRNAsA systematic naming system which provides information to the transcript numberSame as circBase
CircRNA expression profiles in samplesNot availableNot availableNot availableNot availableAn all-sample expression heat-map for every circRNA and linear isoformNot availableNot available
Address on miRNA regulatory relationshipsIdentifies circRNA and miRNA interactionsIdentifies circRNA and miRNA interactionsNot availableIdentifies circRNA and miRNA interactions through Chip-Seq data analysisA network-driven graphical interface shows the relationship between miRNA target genes and circRNAsNot availableIdentifies circRNA and miRNA interactions
RNA-binding proteinNot availableNot availableNot availableNot availableNot availableNot availableIdentifies RNA-binding protein
circRNA isoformsNot availableNot availableNot availableNot availableAll traceable on the integrated genome browserAll traceable on the integrated genome browserNot available