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Available information includes:
The NCBI and Ensembl/Havana annotation of the GRCm38.p6 reference genome (assembly GCF_000001635.26, NCBI annotation release 108, Ensembl annotation release 98) was analyzed to identify additional coding sequences (CDS) that are consistently annotated. CCDS data is available in the CCDS web site and FTP site and will become available in the collaborators' genome and/or gene browser web sites according to each browser's update cycle. This update adds 1,570 new CCDS IDs, and adds 175 genes into the mouse CCDS set. CCDS Release 23 includes a total of 27,219 CCDS IDs that correspond to 20,486 GeneIDs. See the Releases & Statistics report for details. CCDS Release 22 - Update for Human June 14, 2018The NCBI and Ensembl/Havana annotation of the GRCh38.p12 reference genome (assembly GCF_000001405.38, NCBI annotation release 109, Ensembl annotation release 92) was analyzed to identify additional coding sequences (CDS) that are consistently annotated. CCDS data is available in the CCDS web site and FTP site and will become available in the collaborators' genome and/or gene browser web sites according to each browser's update cycle. This update adds 894 new CCDS IDs, and adds 128 genes into the human CCDS set. CCDS Release 22 includes a total of 33,397 CCDS IDs that correspond to 19,033 GeneIDs. See the Releases & Statistics report for details. See Past Announcements
Annotation of genes is provided by multiple public resources, using different methods, and resulting in information that is similar but not always identical. The human and mouse genome sequence is now sufficiently stable to start identifying those gene placements that are identical, and to make those data public and supported as a core set by the three major public genome browsers. The long term goal is to support convergence towards a standard set of gene annotations. Toward this end, the Consensus CDS (CCDS) project was established. The CCDS project is a collaborative effort to identify a core set of protein coding regions that are consistently annotated and of high quality.
Initial results from the Consensus CDS project are now available from the participants' genome browser Web sites. In addition, CCDS identifiers are indicated on the relevant NCBI RefSeq and Entrez Gene records. CCDS reports can be accessed by following provided links, or by directly querying the underlying database using the query interface provided at the top of this page. The CCDS dataset is also available for anonymous FTP.
The CCDS set is built by consensus among the collaborating members which include:
Annotated genes that are included in the CCDS set are associated with a unique identifier number and version number (e.g., CCDS1.1, CCDS234.1). The version number will update if the CDS structure changes, or if the underlying genome sequence changes at that location. With annotation and sequence based genome browser update cycles, the CCDS set will be mapped forward, maintaining identifiers. All changes to existing CCDS genes are done by collaboration agreement; no single group will change the set unilaterally.
The CCDS set is calculated following coordinated whole genome annotation updates carried out by the NCBI and Ensembl. Annotation updates represent genes that are defined by a mixture of manual curation and automated computational processing. The main curation groups are the Havana team at EMBL-EBI and the RefSeq annotation group at NCBI. The automatic methods are via the Ensembl group and the NCBI genome annotation computational pipeline. Curated information is favored over automated information and the information has to be both consistent in the EMBL-EBI and NCBI groups and also pass stringent QC controls. The general process flow for defining the CCDS gene set includes:
The CCDS set includes coding regions that are annotated as full-length (with an initiating ATG and valid stop-codon), can be translated from the genome without frameshifts, and use consensus splice-sites. The number and type of quality tests performed may be expanded in the future but includes consistency in cross-species comparative analysis, analysis to identify putative pseudogenes, retrotransposed genes, consensus splice sites, supporting transcripts, and protein homology.
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The Consensus CDS (CCDS) project is a collaborative effort to identify a core set of human and mouse protein coding regions that are consistently annotated and of high quality. The long term goal is to support convergence towards a standard set of gene annotations. 