[BioC] Run GOHyperG on yeast without specifying a chip
James W. MacDonald
jmacdon at med.umich.edu
Tue Jul 4 16:01:23 CEST 2006
Hi Maria,
maria at cbm.bio.uniroma2.it wrote:
> Hello everyone,
>
> I'm trying to calculate the probability that 2 YEAST proteins share the
> same biological process by chance as suggested in the Liu's paper (PMID
> 15905281); I want a p-value associated to each protein pair in my data
> set; I would like to use the Bioconductor implementation of GO analysis:
> in the help page of the GOHyperG I read the following phrase:
>
> " For S. cerevisiae if the 'lib' argument is set to '"YEAST"' then
> comparisons and statistics are computed using common names and are with
> respect to all genes annotated in the S. cerevisiae genome not with
> respect to any microarray chip."
>
> this is exactly my case, I don't have a chip. I load the libraries GOstats
> and YEAST and I choose two common names of two proteins to see if the
> pipeline works:
>
>>library(GOstats)
>>library(YEAST)
>
>
>>myYCM<-c("RAD24","DMC1")
>
>
> At this point I got the following error message:
>
>
>>xx<-GOHyperG(myYCM, lib="YEAST", what="BP", universe=NULL)
>
> Error in length(p at universeGeneIds) - numAtCat :
> non-numeric argument to binary operator
>
> I suppose that the problem is the universe; what should I provide as
> universe value if comparisons and statistics are computed using common
> names....in the error message I see p at universeGeneIds!?
I don't think that is the problem. I think the common names expected are
things like "YPL113C" "YNL055C" "YKL154W" "YNR076W" (I believe
these are the Locus Tags?). If I look up the correct locus tags for your
genes, things work for me.
> myYCM<-c("YER173W", "YER179W")
> xx<-GOHyperG(myYCM, lib="YEAST", what="BP", universe=NULL)
>
HTH,
Jim
>
> thanks,
>
> Maria
>
> Maria Persico, PhD. student
> http://cbm.bio.uniroma2.it/~maria/
> MINT database group
> Universita' di Tor Vergata, via della Ricerca scientifica 11
> 00133 Roma, Italy
> Tel +39 0672594315 (Supervisor's room)
> Fax +39 0672594766
> Mobile phone: +393479715662
> e-mail maria at cbm.bio.uniroma2.it
>
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--
James W. MacDonald
University of Michigan
Affymetrix and cDNA Microarray Core
1500 E Medical Center Drive
Ann Arbor MI 48109
734-647-5623
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