Map probeset IDs to Chromosomal Location

Description

gahgu133aCHRLOC is an R object that maps probeset identifiers to the starting position of the gene. The position of a gene is measured as the number of base pairs.

The CHRLOCEND mapping is the same as the CHRLOC mapping except that it specifies the ending base of a gene instead of the start.

Details

Each probeset identifier maps to a named vector of chromosomal locations, where the name indicates the chromosome. If the chromosomal location is unknown, the vector will contain an NA.

Chromosomal locations on both the sense and antisense strands are measured as the number of base pairs from the p (5' end of the sense strand) to q (3' end of the sense strand) arms.

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

Examples

        x <- gahgu133aCHRLOC
        # Get the probe identifiers that are mapped to chromosome locations
        mapped_probes <- mappedkeys(x)
        # Convert to a list
        xx <- as.list(x[mapped_probes])
        if(length(xx) > 0) {
          # Get the CHRLOC for the first five probes
          xx[1:5]
          # Get the first one
          xx[[1]]
        }