Question: Pre-processing of reads for nucleosome calling using PING
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21 months ago by
devking0
devking0 wrote:

Dear all,

I'd like to call nucleosomes from yeast MNase-seq data. In particular, I'm interested in using the PING (Zhang et al., 2012) bioconductor package. The PING documentation discusses all of the post-mapping analysis steps. My question is, however, are there any important pre-processing steps I should be aware of? I'm already filtering out multi-mappers and reads with low quality mapping scores. Typical ChIP-seq peak callers (like MACS) remove all redundant reads (e.g. reads with identical 5' and 3' coordinates). For nucleosome calling, should I also use strict read de-duplication? Or should I use something like FixSeq (Hashimoto et al., 2014) to remove certain redundant reads? Anything else?

Naively, I expect lots of redundant reads, at least those that correspond to well-positioned nucleosomes.

Thanks in advance for any insight.

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