[BioC] GSEABase how to map gene symbols to mouse EntrezId or Affy

[Martin Morgan]

Hi Vladimir --

"Vladimir Morozov" <vmorozov at als.net> writes:

> Hi
>  
> Any suggestions how to map  gene symbols to mouse EntrezId(preffered) or
> Affy. 
> mapping to Entez apparently is not supported by GSEABase
>> mapIdentifiers(gss,EntrezIdentifier())
> Error in .mapIdentifiers_isMappable(from, to) : 
>   unable to map from 'Symbol' to 'EntrezId'
>     neither GeneIdentifierType has annotation

mapIdentifiers needs to know where to look for the map. I guess the
way you created gss means that it doesn't know about the organism
you're using, and EntrezIdentifier() also doesn't. What you want is

> mapIdentifiers(gss, EntrezIdentifier("org.Mm.eg.db"))
GeneSetCollection
  names: chr5q23, chr16q24 (2 total)
  unique identifiers:  (0 total)
  types in collection:
    geneIdType: EntrezIdentifier (1 total)
    collectionType: BroadCollection (1 total)

Here I'm using (and I guess you are too) the gss that comes from
example(getBroadSets). These are human genes, and have no
corresponding mouse equivalents (see below)...

> Error in GeneSetCollection(lapply(what, mapIdentifiers, to, ..., verbose
> = verbose)) : 
>   error in evaluating the argument 'object' in selecting a method for
> function 'GeneSetCollection'
>  
>  
> Mapping to Affys works for human, but not for mouse
>> mapIdentifiers(gss, AnnotationIdentifier("hgu95av2.db"))
> GeneSetCollection
>   names: chr5q23, chr16q24 (2 total)
>   unique identifiers: 35089_at, 35090_g_at, ..., 35807_at (79 total)
>   types in collection:
>     geneIdType: AnnotationIdentifier (1 total)
>     collectionType: BroadCollection (1 total)
>> mapIdentifiers(gss, AnnotationIdentifier("mouse4302.db"))
> GeneSetCollection
>   names: chr5q23, chr16q24 (2 total)
>   unique identifiers:  (0 total)
>   types in collection:
>     geneIdType: AnnotationIdentifier (1 total)
>     collectionType: BroadCollection (1 total)

This is becaus the identifiers are not in mouse

> ids <- unique(unlist(geneIds(gss)))
> egs <- mget(ids, revmap(mouse4302ENTREZID), ifnotfound=NA)
> sum(!sapply(egs, is.na))
[1] 0

>> 
>  
>  
> Thanks
>  
>
> Vladimir Morozov 
>
>
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>
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-- 
Martin Morgan
Computational Biology / Fred Hutchinson Cancer Research Center
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