Hi, all; I've got a large number of expression values that are currently associated with the old 2004 rat genome build RefSeq IDs, and unfortunately it looks like the Ensembl biomaRt and most of the online resources have updated to the new RefSeqs and I can't seem to link back to the old ones. I think an old version of org.Rn.eg.db would do the trick but the current version is also updated. Is there any way to get an older version that would have the older mappings, or is there a way to easily map the obsolete RefSeq IDs to the updated ones? I'm aware of Eutils, but if there's an existing solution I'd prefer not to reinvent the wheel. Thanks! Hollis Wright, PhD Ojeda Lab, Division of Neuroscience Oregon Health and Science University

Hi Hollis, See here: http://bioconductor.org/install/ at the bottom right of the page. It will take some sleuthing, and may require the install of an older version of R, but all the previous versions of BioC including the metadata are still available. Best, Jim On 10/3/2012 8:09 PM, Hollis Wright wrote: > Hi, all; I've got a large number of expression values that are currently associated with the old 2004 rat genome build RefSeq IDs, and unfortunately it looks like the Ensembl biomaRt and most of the online resources have updated to the new RefSeqs and I can't seem to link back to the old ones. I think an old version of org.Rn.eg.db would do the trick but the current version is also updated. Is there any way to get an older version that would have the older mappings, or is there a way to easily map the obsolete RefSeq IDs to the updated ones? I'm aware of Eutils, but if there's an existing solution I'd prefer not to reinvent the wheel. Thanks! > > Hollis Wright, PhD > Ojeda Lab, Division of Neuroscience > Oregon Health and Science University > _______________________________________________ > Bioconductor mailing list > Bioconductor at r-project.org > https://stat.ethz.ch/mailman/listinfo/bioconductor > Search the archives: http://news.gmane.org/gmane.science.biology.informatics.conductor -- James W. MacDonald, M.S. Biostatistician University of Washington Environmental and Occupational Health Sciences 4225 Roosevelt Way NE, # 100 Seattle WA 98105-6099