org.Hs.egSYMBOL {org.Hs.eg.db} | R Documentation

## Map between Entrez Gene Identifiers and Gene Symbols

### Description

org.Hs.egSYMBOL is an R object that provides mappings between entrez gene identifiers and gene abbreviations.

### Details

Each entrez gene identifier is mapped to the a common 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: Entrez Gene ( ftp://ftp.ncbi.nlm.nih.gov/gene/DATA ) on 2008-Apr2

### References

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

### Examples

            x <- org.Hs.egSYMBOL
            # Get the gene symbol that are mapped to an entrez gene identifiers
            mapped_genes <- mappedkeys(x)
            # Convert to a list
            xx <- as.list(x[mapped_genes])
            if(length(xx) > 0) {
              # Get the SYMBOL for the first five genes
              xx[1:5]
              # Get the first one
              xx[[1]]
            }
            # For the reverse map:
            x <- org.Hs.egSYMBOL2EG
            # Get the entrez gene identifiers that are mapped to a gene symbol
            mapped_genes <- mappedkeys(x)
            # Convert to a list
            xx <- as.list(x[mapped_genes])
            if(length(xx) > 0) {
              # Get the entrez gene ID for the first five genes
              xx[1:5]
              # Get the first one
              xx[[1]]
            }

[Package org.Hs.eg.db version 2.2.0 Index]