Dear Bioconductor community,

I am working with Human Gene 2.0 ST Array. At the annotation process, I have doubts which .db library to use:

- hugene20sttranscriptcluster.db

- hugene20sthsentrezg.db or

- hugene20stprobeset.db?

Can you please indicate what are the differences between these three and in which situations should I use one or the other .db library?

Many thanks in advance

Sofia

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Ana Sofia Figueiredo

Bioinformatician, University of Heidelberg

The hugene20sttranscriptcluster.db package is for when you have summarized the data at the 'core' level, which is by transcript. The hugene20stprobeset.db package is for when you have summarized at the 'probeset' level, which is roughly the exon level. The hugene20sthsentrezg.db package is for when you summarized using the MBNI re-mapped probesets.

In the vast majority of cases you should use the hugene20sttranscriptcluster.db package. Also, while the pd.hugene.2.0.st package does contain annotation data, those data are simply parsed versions of the Affymetrix annotation csv files, and while giroudpaul may find those easier to deal with, I think that is probably a minority opinion.