[BioC] How to get ENTREZID from Gene symbol in bioconductor

[Marc Carlson]

Srinivas Iyyer wrote:
> Dear group: 
> I have a vector of gene symbols. 
> I want to get EntrezID for those gene symbols. 
> I want to use hgu133plus2 as my annotation
> environment. 
>
> how can I do it. 
>
> here is my vector:
>
> msba <- c('AURKA','CCNB2','TRIP13','EZH2','TYMS')
>
> when I have probesetid it is straightforward for me. 
>
> thanks for your help. 
>
> srini
>
>
>
>
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#I would use this library to save a couple steps:

library(org.Hs.eg.db)

#then you can choose one of two options:
#use this if you are confident that your gene symbols are mainstream:
mget(msba, revmap(org.Hs.egSYMBOL))

#OR if you want to be more inclusive about your symbols you can also use
this:
mget(msba, org.Hs.egALIAS2EG)


#I see that in your case the 1st option is really better since you find
everything with that already.

# Marc