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Analyze rice TF RNA-Seq and ChIP-Seq
In the paper, it says:
After sequencing, 185, 6125, 220, 455 peaks were finally obtained respectively in OX127H, OX127N, OX129H and OX129N.
However, I got: 52--> NAC127H; 179--> NAC127N; 132-->NAC129H; 139-->NAC129N.
I tried some several settings in masc2
, but always have fewer peaks than reported.
The method that got more peaks would be analyzing three reps individually with the control. Then combine all the peaks.
For GSE72186 OsNF-YB1 ChIP, genes that found in either replicate were kept.
I think this is similar to what the paper did:
Overlapping peaks (having a stronger but narrower peak in at least one replicate) between two biological replicates were used for further analysis.
The final file is the GSE72186_rep12.MACS2_summits_gene_list_2404
It's not clear how they call peaks for this TF in the paper. I have many issues with the dataset.
chr03-7132344-7133928-NT-H3K4me3-7455
. Besides, the peak range is too long, probably from --broad
in MACS? But should TF use this setting?In summary, I re-did the analysis using the same pipeline as PE.
Only SRR5164450 Roc10-myc α-myc ChIPseq was used for peak calling.
I have to use --nomodel --extsize 147
, otherwise, no peaks could be found.
In the end I got 161 peaks correspondent to 85 genes (within 2kb region)
The data was from this paper.
In the paper TableS3, there are 14 libraries. However, only 12 in the GEO/SRA. Missing one WT-48HAF and one WT-72-HAF.
There is only one replicate of genotype x time combination. For example, one replicate of OE78 x 48HAF. So there is no way to do good the statistical tests. See table below.
The conclusion: give up MADS78/79. Unless we want to combine 48HAF and 72HAF and use as replicates.
Does one TF allow multiple DE gene list?
For example, there are two lines fo mutants bzip76-1 and bzip76-2 with wildtype.
Do I keep two lists as bzip76-1 vs wt and bzip76-2 vs wt?
Or combine them together? Is so, should I use a union or intersection?
This paper has a root specific OX line, whole body OX line and a KO mutant, but I could only find one replicate for each of the mutant lines - so we probably can't use this right? - I think it is fine to skip since we already have OsNAC6 from the paper with the 4 NACs.
there is no treatment info from the SRP meta-data. So I used the GSM ID to find the treatment info from GSE.
I added the info to the treatment column in SraRunTable_20200430_11SRP.tsv
file.
There are two SRA correspondent to one GSM. At first, I thought they split the single-end files because of the file size. However, they all have the same number of reads. So I think they are actually paired-end reads! But which is read1 and which is read2 is not clear.
In conclusion, unless we really want this TF. I can try to reallign. Otherwise, I gave up this TF.
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