Annotation of DESeq2 normalized count matrix?

Question

[adam.sorbie]

Hi,

I would like to annotate the DE results obtained from DESeq2 with go terms, and then subset by a particular term I am interested in (in this case lipid metabolism). I am using AnnotationDbi with org.Mm.eg.db database to convert ensembl ids to hgnc symbols, is it also possible to use this to add an extra column to results dataframe with the associated go term? Additionally, I would like to annotate the normalized counts obtained from DESeq2, but this does not work with the mapIDs function in AnnotationDbi, is there a workaround for this?