I attempted to retrieve values of dn and ds for human/mouse gene
comparisons in Ensembl using BiomaRt (R application), and get the following
error (with mart defined as ensembl human reference genome):

t = getBM(attributes = "mmusculus_homolog_dn", filters =
"hgnc_symbol", values = "GABRA6", mart = mart)
Error in `[.data.frame`(result, , attributes) :
 undefined columns selected

In contrast, if I try to retrieve some other attribute, such as mouse gene
id, it works (e.g.)

> t = getBM(attributes = "mmusculus_homolog_ensembl_gene", filters = "hgnc_symbol", values = "GABRA6", mart = mart)
> t
   [1] "ENSMUSG00000020428"

So it doesn't seem to be a syntax error. What am I doing wrong in calling
the "mmmusculus...dn" attribute (and the same issue with ds)?


Thanks very much,

Marcus G.

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