Mu22v3ENSEMBL {Mu22v3.db} | R Documentation

## Map Ensembl gene accession numbers with Entrez Gene identifiers

### Description

Mu22v3ENSEMBL 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 BOTH of these sources: http://www.ensembl.org/biomart/martview/ ftp://ftp.ncbi.nlm.nih.gov/gene/DATA

This mapping is a combination of NCBI to ensembl IDs from BOTH NCBI and ensembl. Users who wish to only use mappings from NCBI are encouraged to see the ncbi2ensembl table in the appropriate organism package. Users who wish to only use mappings from ensembl are encouraged to see the ensembl2ncbi table which is also found in the appropriate organism packages. These mappings are based upon the ensembl table which is contains data from BOTH of these sources in an effort to maximize the chances that you will find a match.

### Examples

        x <- Mu22v3ENSEMBL
        # 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(Mu22v3ENSEMBL2PROBE)
        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 Mu22v3.db version 2.2.11 Index]