gahgu133aSYMBOL {gahgu133a.db} | R Documentation

## Map between probeset and Gene Symbols

### Description

gahgu133aSYMBOL is an R object that provides mappings between probeset and gene abbreviations. gahgu133aSYMBOL2PROBE provides the reverse mapping.

### Details

Each probeset is mapped to an abbreviation for the corresponding gene. An `NA` is reported if there is no known abbreviation for a given gene.

Symbols typically consist of 3 letters that define either a single gene (ABC) or multiple genes (ABC1, ABC2, ABC3). Gene symbols can be used as key words to query public databases such as Entrez Gene.

Mappings were based on data provided by: Genecards ( http://www.genecards.org ) on 2009-mag06

### References

http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=gene

### Examples

            x <- gahgu133aSYMBOL
            # Get the probe identifiers that are mapped to a gene symbol
            mapped_probes <- mappedkeys(x)
            # Convert to a list
            xx <- as.list(x[mapped_probes])
            if(length(xx) > 0) {
              # Get the SYMBOL for the first five probes
              xx[1:5]
              # Get the first one
              xx[[1]]
            }

[Package gahgu133a.db version 2.0.1 Index]