User: mark.ziemann
mark.ziemann • 1.3k
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- Australia/Mebourne/Geelong/Deakin
- Website:
- http://genomespot.blog...
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- @mdziemann
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I'm a researcher and lecturer at Deakin University, Australia. I use Next Generation Sequencing to study epigenetics in a range of human diseases. Maintainer of the DEE2 RNA-seq database: http://dee2.io
Posts by mark.ziemann
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... Some additional information would be useful. What species are you working on? Is there a good quality reference genome and gene annotations already or are you doing this de novo? Do you have a set of transposon sequences already that you are trying to quantify or do you need to characterise these de ...
written 11 weeks ago by
mark.ziemann • 1.3k
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... Hi Biostars,
I'm looking for a package/tool that can perform DMR calling of Infinium array data after meta-analysis. All the packages I've seen so far (eg:DMRcate and bumphunter) require the original matrices of m- or beta-values which won't work for us.
We tried combp from the ENmix package but t ...
written 3 months ago by
mark.ziemann • 1.3k
• updated
11 weeks ago by
Biostar ♦♦ 20
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... The statistical packages like DESeq2 should be able to manage with unbalanced replicate numbers as long as the numbers are not too low. Downsampling shouldn't be required. If you still have a doubt, you can ask on the Bioconductor forum [1] tagging the tool that you are using.
1. https://support.b ...
written 4 months ago by
mark.ziemann • 1.3k
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... If you visit the Ensembl FTP site [1] and search for "CAST/EiJ" you will see there is a build for this strain. Similarly there are many other mouse strains also included. The "cDNA" fasta can be used for Salmon and Kallisto. Just take note that this will not include non-coding RNAs. I you want those ...
written 4 months ago by
mark.ziemann • 1.3k
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... It could be:
1. Difference in bisulfite conversion efficiency
2. Overall error rate differences in these seq runs - if you could obtain the phi-x from those runs you could check the error rates precisely
3. Something related to the alignment search space being twice as large for non-directional ...
written 11 months ago by
mark.ziemann • 1.3k
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... Are you able to use the SRA search and send the results to SRA run selector? Then you can collect a list of SRA runs (start with SRR.ERR.DRR) which you can pass to prefetch.
I have used SRAdb and SRAdbV2 in the past, but these packages are no longer maintained ...
written 11 months ago by
mark.ziemann • 1.3k
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... Duplicate question. You could try the suggested answer from a [previous post][1]
[1]: https://www.biostars.org/p/131329/#131449 ...
written 11 months ago by
mark.ziemann • 1.3k
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... Could you give the version of MACS2 you are using and specify which output file you are referring to. There should be a narrowPeak.bed file present among the results. If you also provide the command you used to perform the analysis it will help us troubleshoot it for you. ...
written 11 months ago by
mark.ziemann • 1.3k
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... Here is another paper that might be interesting where they discuss RNA-seq without replicates
[GFOLD: a generalized fold change for ranking differentially expressed genes from RNA-seq data.][1]
[1]: https://www.ncbi.nlm.nih.gov/pubmed/22923299 ...
written 11 months ago by
mark.ziemann • 1.3k
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... Gene location information can be found in the GTF or GFF files on the [Ensembl FTP site][1]. You just need to make sure that the version of the GTF/GFF file you use is the same as the annotation of the gene list you received. Older versions of Ensembl can be found at the [archive][2].
Here is the f ...
written 11 months ago by
mark.ziemann • 1.3k
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