Calculating GC content of all CpG islands

Question

[Baby Bioinformatician]

Hi Biostars, I have two files containing the genomic ranges of all CpG islands and promoter sequences of Human genome hg19. I would like to do an association test between CpG islands and promoters. So I need to calculate the GC contents of the two files. However, I am not conversant working with genomic coordinates. Could somebody please help with a command that I can use to calculate the GC contents of the two files. Thanks.

[ATpoint]

Please use the search function. One approach is to get the sequences of the coordinates using bedtools getfasta and then use e.g. How To Calculate A Region‘ Gc Content In Reference Genome？？

[archana.bioinfo87]

Hi

If you are using R; can try seqinr package. On that you could find function "GC" and can do whatever you are looking for.