It is my first time working with the Affy Human Exon St. 1.0. I use Affymetrix Power Tools (APT) and R to do it.Thus, I get two ExpressionSet on exon-level and gene-level,but I have a little questions about the annotation method by biomaRT.
I can annotate the the probesetid in exon-level ExpressionSet by biomaRT
eg:ensembl = useMart("ensembl",dataset="hsapiens_gene_ensembl")
getBM(attributes=c('affy_huex_1_0_st_v2', 'hgnc_symbol'),filters="affy_huex_1_0_st_v2",value="2315588",mart=ensembl)#2315588 is a probesetid
but i cannot annotate the transcriptclusterids produced in the gene-level ExpressionSet only by biomaRT.
eg:getBM(attributes=c('affy_huex_1_0_st_v2', 'hgnc_symbol'),filters="affy_huex_1_0_st_v2",value="2316379 ",mart=ensembl) #2316379is a transcript_cluster_id
Is there no direct annotation of transcript_cluster_id by biomaRt or there is any error of my code?
Thank you very much in advance