celegansENSEMBL {celegans.db} | R Documentation

## Map Ensembl gene acession numbers with Entrez Gene identifiers

### Description

celegansENSEMBL is an R object that contains mappings between Entrez Gene identifiers and Ensembl gene accession numbers.

### Details

This object is a simple mapping of Entrez Gene identifiers http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=gene to Ensembl gene Accession Numbers.

Mappings were based on data provided by ensembl: http://www.ensembl.org/biomart/martview/

### Examples

        x <- celegansENSEMBL
        # Get the entrez gene IDs that are mapped to an Ensembl ID
        mapped_genes <- mappedkeys(x)
        # Convert to a list
        xx <- as.list(x[mapped_genes])
        if(length(xx) > 0) {
          # Get the Ensembl gene IDs for the first five genes
          xx[1:5]
          # Get the first one
          xx[[1]]
        }
        #For the reverse map ENSEMBL2PROBE:
        # Convert to a list
        xx <- as.list(celegansENSEMBL2PROBE)
        if(length(xx) > 0){
           # Gets the entrez gene IDs for the first five Ensembl IDs
           xx[1:5]
           # Get the first one
           xx[[1]]
        }

[Package celegans.db version 2.2.11 Index]