[BioC] enrichment of GO terms based on input gene list

[Joseph Nalluri [guest]]

Hello Bioconductor group,

 I am trying to derive a list of enriched GO terms from a set of genes given by a user. The way I understand and am implementing is:

My input is a csv file consisting of about 500 genes.

library(topGO)        
library(hgu133plus2.db)
all.genes <- ls(hgu133plus2ACCNUM)

data <- read.csv(file.choose(),header=FALSE)
#Here I give an input csv file containing genes

relevant.genes <- factor(as.integer(all.genes %in% data)
names(relevant.genes) <- all.genes
GOdata.BP <- new("topGOdata", ontology='BP', allGenes = relevant.genes, annotationFun = annFUN.db, affyLib = 'hgu133plus2.db')

------------
Error in .local(.Object, ...) : allGenes must be a factor with 2 levels
> str(relevant.genes)
 Factor w/ 1 level "0": 1 1 1 1 1 1 1 1 1 1 ...
 - attr(*, "names")= chr [1:54675] "1007_s_at" "1053_at" "117_at" "121_at" ...

--------------

Can you please direct me where am I going wrong? Am I right in using TopGO for this, even though I dont have expression values.

- Joseph

 -- output of sessionInfo(): 

R version 2.15.2 (2012-10-26)
Platform: i686-pc-linux-gnu (32-bit)

locale:
 [1] LC_CTYPE=en_US.UTF-8       LC_NUMERIC=C              
 [3] LC_TIME=en_US.UTF-8        LC_COLLATE=en_US.UTF-8    
 [5] LC_MONETARY=en_US.UTF-8    LC_MESSAGES=en_US.UTF-8   
 [7] LC_PAPER=C                 LC_NAME=C                 
 [9] LC_ADDRESS=C               LC_TELEPHONE=C            
[11] LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=C       

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base     

other attached packages:
 [1] hgu95av2.db_2.8.0    org.Hs.eg.db_2.8.0   topGO_2.10.0        
 [4] SparseM_0.96         GO.db_2.8.0          RSQLite_0.11.2      
 [7] DBI_0.2-5            AnnotationDbi_1.20.7 Biobase_2.18.0      
[10] BiocGenerics_0.4.0   graph_1.36.2        

loaded via a namespace (and not attached):
[1] grid_2.15.2     IRanges_1.16.6  lattice_0.20-14 parallel_2.15.2
[5] stats4_2.15.2   tools_2.15.2  

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