Dear List,
I noticed that for some of the probesets (e.g. 1447625_at), information
retrieved by biomaRt is NULL. However, Affymetrix has it annotated as "E2F5"
when I checked on NetAffx. Why is there a discrepancy? Ultimately, I am
hoping to use biomaRt to find homologs of the mouse probesets on a
Affymetrix human expression array.
Any help in clarifying this situation would be greatly appreciated. Thanks!

> library(biomaRt)
> ensembl <- useMart("ensembl")
> mouse <- useMart("ensembl", "mmusculus_gene_ensembl")
> getGene(id="1448859_at", type="affy_mouse430_2", mart =mouse)
  affy_mouse430_2 markersymbol
1      1448859_at       Cxcl13
                                                              description
chromosome_name band
1 chemokine (C-X-C motif) ligand 13
[Source:MarkerSymbol;Acc:MGI:1888499]               5   E3
  strand start_position end_position    ensembl_gene_id
ensembl_transcript_id
1      1       96197241     96201370 ENSMUSG00000023078
ENSMUST00000023840

> getGene(id="1447625_at", type="affy_mouse430_2", mart =mouse)
NULL

-Ed
Edmund Chang, PhD
One Baylor Plaza M635
Houston, Tx 77030
713-798-6217

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