Find the cytoband(s) overlapping a chromosome location

Description

Allows retrieval of cytobands/karyotypes intersected by a chromosome and position, which can be entered using chr, pos/start/end vectors, or a RangedData or GRanges object

Usage

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Band.pos(chr = NA, pos = NA, start = NA, end = NA, ranges = NULL,
  build = NULL, dir = NULL, bioC = FALSE, one.to.one = TRUE)

Arguments

chr

character, an optional vector of chromosomes to combine with 'pos' or 'start'+'end' (enter in ...) to describe positions to retrieve the possible overlapping cytoband(s)

pos

integer, an optional vector of chromosome positions (for SNPs), no need to enter start or end if this is entered, and vice-versa

start

integer, an optional vector of start points for chromosome ranges

end

integer, an optional vector of end points for chromosome ranges

ranges

optional GRanges or RangedData object describing positions for which we want bands, removing the need to enter chr, pos, start or end

build

character, "hg18" or "hg19" (or 36/37) to show which reference to retrieve. The default when build is NULL is to use the build from the current ChipInfo annotation

dir

character, 'dir' is the location to download gene annotation information to; if left as NULL, depending on the value of getOption("save.annot.in.current"), the annotation will either be saved in the working directory to speed-up subsequent lookups, or deleted after use.

bioC

logical, if true then return position information as a GRanges object, or RangedData if 'ranges' is RangedData, else a data.frame

one.to.one

logical, whether to concatenate multiple hits for the same range into one result, or spread the result over multiple lines, one for each cytoband overlapped

Value

Returns a set of cytobands separated by semicolons (if more than one) for each range entered. If bioC=TRUE, returns the equivalent as a GRanges object, unless a RangedData object was used for the ranges parameter, in which case a RangedData object would be returned. If one.to.one is FALSE, then instead of concatenating multiple cytobands into one line per range, each is listed separately as a new row, with an index added to correspond to the original input order of ranges, if bioC=TRUE; or just adds additional elements to the resulting vector if bioC=FALSE.

Author(s)

Nicholas Cooper nick.cooper@cimr.cam.ac.uk

See Also

Chr, Pos, Pos.band, Band, Band.gene, Band.pos, Gene.pos

Examples

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setwd(tempdir())
Band.pos(chr=6, start=31459636, end=31462760)
Band.pos(chr=22, pos=3452345) 
Band.pos(Chr("rs689"),Pos("rs689")) # combine Chr(), Pos() to find the cytoband for SNP rs689
Band.pos(chr=1,start=110000000,end=120000000,build="hg19") # multiple cytobands in range
Band.pos(chr=1,start=110000000,end=120000000,one.to.one=FALSE) # list separately
Band.pos(Pos.band(c("13q21.31","1p13.2"),bioC=TRUE)) # use ranges object returned by Pos.band()
# note that 3 ranges are returned for each entry as the start/end overlap the adjacent ranges

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