I need to get SNP data from HapMap via biomaRt, but am having trouble 
getting any results from any query of the hapmap_rel27 dataset.  For 
example, both of the following:

HM <- useMart("HapMap_rel27","hm27_variation_ceu")
ceu <- getBM(
c("chrom","start","strand","marker1"),
filters=c("chrom"), values="chr22",HM)
)

hapmap <- useMart("HapMap_rel27", dataset="hm27_variation_yri")
yri <- 
getBM(c("chrom","start","alleles","ref_allele","ref_allele_freq","other_allele_freq",filters=c("chrom","coding_nonsynon"),values=list("chr19",TRUE),mart=hapmap)

result in an empty table such as:

 > head(yri)
[1] chrom             start             alleles          
ref_allele        ref_allele_freq   other_allele_freq
<0 rows> (or 0-length row.names)

I've tried with both biomaRt 2.8.1 and 2.9.2.  Queries to marts ensembl 
or snp work as expected.  Am I missing a detail in my queries to HapMap, 
or is there an issue with the mart?

Regards,
Deidre


 > sessionInfo()
R version 2.13.0 (2011-04-13)
Platform: i386-pc-mingw32/i386 (32-bit)

locale:
[1] LC_COLLATE=English_United States.1251  LC_CTYPE=English_United 
States.1252    LC_MONETARY=English_united States.1252
[4] LC_NUMERIC=C                           LC_TIME=English_United 
States.1252

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

other attached packages:
[1] biomaRt_2.9.2

loaded via a namespace (and not attached):
[1] RCurl_1.6-6.1 tools_2.13.0 XML_3.4-0.2

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