User: Phil Ewels
Phil Ewels • 70
- Reputation:
- 70
- Status:
- Trusted
- Location:
- Sweden / Stockholm / SciLifeLab
- Website:
- http://phil.ewels.co.uk/
- Twitter:
- tallphil
- Scholar ID:
- Google Scholar Page
- Last seen:
- 6 months ago
- Joined:
- 3 years, 8 months ago
- Email:
- p*********@scilifelab.se
Bioinformatician working for the NGI Applications group at SciLifeLab in Stockholm. Interested in epigenetics. Author of MultiQC.
Posts by Phil Ewels
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... We are looking for a system administrator and developer to join our production team to develop and maintain informatics solutions handling the production’s internal data flow. The job will include development of automated solutions for processing Next Generation Sequencing (NGS) data and extensive s ...
written 7 months ago by
Phil Ewels • 70
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... If you post a link to the paper that would help to clarify the question :) ...
written 9 months ago by
Phil Ewels • 70
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... If you want for all Cytosines, not context specific (CpG / CHG / CHH as printed in the report) just add the numbers:
* Total C's analysed `1218062196`
* Methylated C's in CpG context `31593318`
* Methylated C's in CHG context `1525159`
* Methylated C's in CHH context `3319601`
```
( (31593318 + 15 ...
written 9 months ago by
Phil Ewels • 70
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... Tools such as [Bismark](https://www.bioinformatics.babraham.ac.uk/projects/bismark/) and [bwa-meth](https://github.com/brentp/bwa-meth) align WGBS reads and then extract the methylation status of every cytosine within each aligned read. They also produce summary statistics, including the genome-wide ...
written 9 months ago by
Phil Ewels • 70
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... RNA-seq data has reads that span exon-exon boundaries. BowTie will not align these reads, so you'll only get back alignments that lie entirely within an exon. Tophat / STAR etc are "splice aware" aligners, so work with RNA-seq data. ...
written 9 months ago by
Phil Ewels • 70
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... Ouch! Maybe time to start running [FastQ Screen](https://www.bioinformatics.babraham.ac.uk/projects/fastq_screen/) routinely.. :) ...
written 9 months ago by
Phil Ewels • 70
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... Ah yes, absolutely. I guess it depends on how extreme the base composition wobbling is.. I was imagining 100% for each base but on re-reading the OP it could well be hexamer priming as you say. ...
written 9 months ago by
Phil Ewels • 70
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... Whilst I agree that contamination with another species is a concern, I can't see how this would affect the base composition for the first 10 bp of each read? ...
written 9 months ago by
Phil Ewels • 70
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... One possible explanation for this is a poor efficiency of the poly-A enrichment, possibly combined with DNA contamination. No enrichment is ever 100% efficient, so other material can always get into the library. If you have antisense reads in exons, this can sometimes be due to DNA contamination. Th ...
written 9 months ago by
Phil Ewels • 70
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... It's probably worth trying the 5' trimming approach from my answer below first.. ;) I'm pretty sure that'll fix your problems and it's not to do with your reference. ...
written 9 months ago by
Phil Ewels • 70
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