How to split the .bigWig file into equal size of bin?
I am trying to output a .bedgraph like the following:
chrom start end mean
chr1 554300 554400 34
chr1 554400 554500 43
chr1 554500 554600 45
chr1 554600 554700 65
chr1 554700 554800 34
from a .bigWig file. how can i do this?
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2 answers
use the UCSC tool bigWigAverageOverBed (not tested)
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Here's another way that lets you control more parameters:
$ assembly=hg38
$ bin_size=100
$ bigWigToWig signal.bw signal.wig
$ wig2bed < signal.wig > signal.bed
$ fetchChromSizes ${assembly} \
| grep -v '_*_' \
| awk -v FS="\t" -v OFS="\t" '{ print $1, "0", $2 }' \
| sort-bed - \
| bedops --split ${bin_size} - \
| bedmap --echo --mean --delim '\t' - signal.bed \
> answer.bg
The bedmap tool will let you swap out --mean with various other statistical operations, for instance (median, max, min, etc.).
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