November 20, 2018
The alternative reference strain SK1 is a rapid and synchronously sporulating diploid constructed by Kane and Roth in the early 1970’s to study carbohydrate metabolism under sporulation conditions. Whereas the reference strain S288C is notorious for being poor at sporulation, SK1 undergoes sporulation readily, and as such has been widely used to study the genetics of sporulation and meiosis.
The genome of SK1, which was temporarily removed from SGD, is now available once again with an updated sequence provided by Scott Keeney from the Sloan Kettering Institute. You can access the updated SK1 sequence for your favorite genes from the Sequence tab, in the Alternative Reference Strains section (example: ECM22 Sequence page). To access the entire SK1 genome sequence, visit the SK1 Strain page.
In addition, we have updated following Sequence and Analysis tools to utilize the latest SK1 sequence:
March 27, 2016
In an effort to provide a comprehensive view of sequence-based functional elements in Saccharomyces cerevisiae, we have upgraded our genome browser, and added new data tracks, to allow users to quickly and easily browse the information-rich yeast genome. We invite authors to work with us to integrate published data into our new JBrowse genome viewer pre- and/or post-publication. Please contact us if you are interested in participating or have questions and comments. Watch for the regular addition of new tracks to SGD’s JBrowse in the future!
Take a look at our newest video tutorial to get acquainted with JBrowse, and let us know if you have any questions or suggestions.
For more SGD Help Videos, visit our YouTube channel, and be sure to subscribe so you don’t miss anything!
February 23, 2015
SGD curators periodically update the chromosomal annotations of the S. cerevisiae Reference Genome, which is derived from strain S288C. Last November, the genome annotation was updated for the first time since the release of the major S288C resequencing update in February 2011. Note that the underlying sequence of 16 assembled nuclear chromosomes, plus the mitochondrial genome, remained unchanged in annotation release R64.2.1 (relative to genome sequence release R64.1.1).
The R64.2.1 annotation release included various updates and additions. The annotations of 2 existing proteins changed (GRX3/YDR098C and HOP2/YGL033W), and 1 new ORF (RDT1/YCL054W-A) and 4 RNAs (RME2, RME3, IRT1, ZOD1) were added to the genome annotation. Other additions include 8 nuclear matrix attachment sites, and 8 mitochondrial origins of replication. The coordinates of many autonomously replicating sequences (ARS) were updated, and many new ARS consensus sequences were added. Complete details can be found in the Summary of Chromosome Sequence and Annotation Updates.
December 17, 2014
Have you ever wondered what’s happening to your favorite protein as it’s hanging out in the cell? SGD’s advanced search tool, YeastMine, now includes four new templates that can be used to find protein modification and abundance data.
The Gene -> Protein Modifications template retrieves phosphorylation, ubiquitination, succinylation, acetylation and methylation data, currently curated from the following 11 publications: Peng et al. 2003, Hitchcock et al. 2003, Seyfried et al. 2008, Vogtle et al. 2009, Ziv et al. 2011, Mommen et al. 2012, Henriksen et al. 2012, Swaney et al. 2013, Kolawa et al. 2013, Weinert et al. 2013, and Wang et al. 2014.
The Gene -> Experimental N-termini and N-terminal modifications template retrieves experimentally-determined amino-terminal sequence and acetylation data, currently curated from Vogtle et al. 2009 and Mommen et al. 2012.
Lastly, two new templates pull protein abundance data curated from Ghaemmaghami et al. 2003. Gene -> Protein Abundance retrieves molecules/cell counts for a gene or list of genes. The same data can be quickly filtered using the Retrieve -> Proteins in a given molecules/cell abundance range template.
Please explore these new YeastMine protein data templates, and send us your feedback.
December 08, 2014
At SGD, we are expanding our scope to provide annotation and comparative analyses of all major budding yeast strains, and are making progress in our move toward providing multiple reference genomes. To this end, the following new S. cerevisiae genomes have been incorporated into SGD as “Alternative References”: CEN.PK, D273-10B, FL100, JK9-3d, RM11-1a, SEY6210, SK1, Sigma1278b, W303, X2180-1A, Y55. These genomes are accessible via Sequence, Strain, and Contig pages, and are the genomes for which we have curated the most phenotype data, and for which we aim to curate specific functional information. It is important to emphasize that we are not abandoning a standard sequence; S288C is still in place as “The Reference Genome”. However, we do recognize that it is helpful for students and researchers to be able to ‘shift the reference’, selecting the genome that is most appropriate and informative for a specific area of study.
These new genome sequences have been also been added to SGD’s BLAST datasets, multiple sequence alignments, the Pattern Matching tool, and the Downloads site. Please explore these new genomes, and send us your feedback.
August 25, 2014
New Sequence pages are now available in SGD for virtually every yeast gene (e.g., HMRA1 Sequence page), and include genomic sequence annotations for the Reference Strain S288C, as well as several Alternative Reference Genomes from strains such as CEN.PK, RM11-1a, Sigma1278b, and W303 (more Alternative References coming soon). Each page includes an Overview section containing descriptive information, maps depicting genomic context in Reference Strain S288C (as shown below) and Alternative Reference strains, as well as chromosomal and relative coordinates in S288C.
The sequence itself includes display options for genomic DNA, coding DNA, or translated protein.
Also available on each Sequence page are links to redesigned S288C Chromosome pages, links to new Contig pages for Alternative Reference Genomes, and a Downloads menu for easy access to DNA sequences of several other industrial strains and environmental isolates. The new Sequence, Chromosome, and Contig pages make use of many of the features you enjoy on other new or redesigned pages at SGD, including graphical display of data, sortable tables, and responsive visualizations. The Sequence pages also provide seamless access to other tools at SGD such as BLAST and Web Primer. Please explore these new pages, accessible via the Sequence tab on your favorite Locus Summary page, and send us your feedback.
March 11, 2014
The SGD Gene Associations file (GAF; gene_association.sgd) contains Gene Ontology (GO) annotations for all yeast genes, in a standard file format specified by the GO Consortium. We are changing the taxon identifier in this file to be consistent with the reference genome sequence at GenBank and protein entries at UniProt.
Until now, the taxon identifier in column 13 of SGD’s GAF has been 4932, which refers to Saccharomyces cerevisiae in general rather than to a specific S. cerevisiae strain. Starting March 8th, 2014, we have changed this to taxon ID 559292, which is specific to the S288C strain used for the S. cerevisiae reference genome sequence.
Please note that the taxon ID 559292 merely reflects the sequence (genome) to which the geneIDs in column 2 are mapped. SGD will continue to capture gene functions (GO annotations) for all strains of S. cerevisiae. Please contact us if you have any questions.
The S. cerevisiae GO annotations (GAF) can be downloaded from SGD’s Downloads site.
Categories: Data updates
May 28, 2013
YeastMine, SGD’s powerful search and retrieval tool, has been upgraded to use InterMine version 1.1 software. Highlights of this release include a new format for the template results page, the addition of PantherDB and Homologene homolog data, an improved representation of Gene Ontology (GO) information, the ability to set background population within the GO enrichment widget, and an option to share lists with other users. In addition to the existing video tutorials, a new Help document describes some common queries. See an overview of these new features in the video below, New, Fun YeastMine 1.1!:
May 07, 2012
SGD has just released an app for the iPhone, iPad and iPod touch ap(p)tly called “YeastGenome”, containing the latest Saccharomyces cerevisiae information from the database, available now as a free download on iTunes. Search by gene names, gene descriptions or simply browse for quick access to Gene Ontology annotations, mutant phenotypes and protein and genetic interaction data for your favorite genes – all at your fingertips!
Use YeastGenome to:
… with or without an internet connection!
How many ATP-dependent RNA helicases is the S. cerevisiae genome known to encode? Which proteins have a zinc finger motif? Now you can answer these questions and more with the YeastGenome app, whether you’re in line at the supermarket or having lunch with your colleagues or attending a seminar with no wifi-access! Get your friends and colleagues as fired up about The Awesome Power of Yeast as you are – use YeastGenome to email information about genomic features to collaborators and spread the word!
Categories: Data updates
December 16, 2011
Expression analysis at SGD now offers the ability to filter datasets by condition(s) or process(es) studied. A set of controlled vocabulary (CV) terms describing various perturbations associated with microarray experiments has been constructed and defined, and these terms have been used to tag the comprehensive collection of almost 400 datasets now available in SGD’s instance of SPELL (Serial Pattern of Expression Levels Locator). In this manner, datasets displayed in search results can be filtered using tags (CV terms) such as “oxidative stress” or “sporulation.” Filtering is an option for the “New Search,” “Show Expression Levels,” and “Dataset Listing” features. The SPELL interface has been provided through a collaboration with the SGD Colony at Princeton University. Special thanks to Peter Koppstein, Lance Parsons, and Kara Dolinski for help in implementing the dataset tag filtering option for SPELL at SGD.