hgu2beta7CHRLOC {hgu2beta7} | R Documentation

## Mappings between probe identifiers and the chromosomal locations of the genes represented by the probe identifiers

### Description

hgu2beta7CHRLOC maps probe ids to the starting positions of the genes represented by the probe ids on chromosomes. The position of a gene is measured as the number of base pairs.

### Details

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. Chromosomal locations on the antisense strand have a leading "-" sign (e. g. -1234567). NAs are assigned to probe ids whose chromosomal locations are not known.

Since a given gene may have more than one chromosomal locations, each probe id is mapped to a named vector of length 1 or greater. The names of each vector give the chromosome number where the genes reside. When a gene can be mapped to a given chromosome but the exact location of the gene can not be determined with confidence, "random" is appended to the end of the name for a chromosomal location value.

Mappings were based on data provided by:

Golden Path:http://hgdownload.cse.ucsc.edu/goldenPath/hg17/database/. Built: hg17

Package built Wed Feb 16 23:32:20 2005

### Examples

        # Covert to a list
        xx <- as.list(hgu2beta7CHRLOC)
        # Remove probe ids that do not map to any CHRLOC
        xx <- xx[!is.na(xx)]
        if(length(xx) > 0){
            # Gets the location for the first five probes
            xx[1:5]
            # Gets the first one
            xx[[1]]
        }

[Package hgu2beta7 version 1.2.2 Index]