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Old 05-22-2017, 07:45 AM   #1
pepsi_MAX_cherry
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Location: UK

Join Date: May 2017
Posts: 1
Question How do I map Affymetrix probe IDs to gene symbols in R?

I have an ExpressionSet, combArr.eset, that contains Affymetrix Human Genome U133 Plus 2.0 Array gene expression data. I also have a matrix, exprs_combArr.eset, that contains the expression data for combArr.eset. The row names for exprs_combArr.eset are the hgu133plus2 probe IDs, and the column names are the Gene Expression Omnibus sample IDs.

I'd like to change the probe IDs in exprs_combArr.eset to their corresponding gene symbols, but I'm not sure how to do this.

I've retrieved the hgu133plus2SYMBOL object from the hgu122plus2.db package, which contains the mappings between manufacturer identifiers and gene abbreviations, but I'm not sure how to use this to change the probe IDs in exprs_combArr.eset.

I'm new to R and Bioconductor, and programming in general, so any help would be appreciated.
Thank you!
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