Annotate a user's peaks file (which has been preprocessed with the peaksInput() command) with gene information based on optimally chosen geneXtendeR upstream extension file. This command requires a preprocessed "peaks.txt" file (generated using peaksInput()) to be present in the user's working directory, otherwise the user is prompted to rerun the peaksInput() command in order to regenerate it.
Object name assigned from readGFF() command.
Desired upstream extension.
The gene coordinates are extended by 'extension' at the 5-prime end, and by 500 bp at the 3-prime end. The peaks file is then overlayed on these new gene coordinates, producing a file of peaks annotated with gene ID, gene name, and gene-to-peak genomic distance (in bp). Distance is calculated between 5-prime end of gene and 3-prime end of peak.
A data.table formatted version of the annotated file for checking or further calculations.
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