Questions tagged [peak-calling]

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Methods to analyze MeDIP-seq data

I have MeDIP-seq data. I have 6 groups with 15 replicates and a total of 90 human samples. I am trying to choose the best method to analyze them. I would highly appreciate if you can give me your ...
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26 views

Separating peaks of chip-seq with specific length

My data contain several chip-seq results. I have the peaks called by MACS2.I wanted to only look at those peaks that their size is e.g 500bp to 1000bp. How can I separate those peaks efficiently? I ...
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18 views

How to calculate the number of peaks that are upstream/downstream of some other peaks

I have 3 histone marks,I have used Macs2 for peak calling and diffBind to analyze the peaks. I was wondering if you know any way to calculate the peak numbers of one specific histone mark that occur ...
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36 views

differential analysis of chip-seq data

I have several sets of chip-seq data. I called the peaks using Macs2. I am pretty new to the field and I will appreciate any help. I wanted to annotate the peaks and see which peaks are shared between ...
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16 views

How to calculate overlapping between different chip-seq peaks

I have 3 sets of data for peaks called by Macs2 as below: 1-DNA methylation 2-Chip-seq (repression marks) 3-Chip-seq (activation marks) I need to show how many peaks in DNA methylation have the same ...
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75 views

Hypergeometic test for the overlap of two set of genomic intervals (e.g. from Chip-seq data)

Suppose I have done two Chip-seq experiments. Now after the bias correction step such as MACS2, I get two set of genomic intervals (or peaks, as what is usually called) that corresponds to each of the ...
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44 views

How to make Venn diagram for the Macs peak calling output of two data sets?

I have two outputs of macs2 peak calling for two of my data sets. I wanted to plot the Venn diagram to see how many peaks are shared. I mainly work on Unix/Linux. Do you know any way that I can have ...
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67 views

How to get the intersection of peaks after peak calling using MACS2?

I have following 5 narrow peak files after peak calling. K14_peaks.narrowPeak K15_peaks.narrowPeak K16_peaks.narrowPeak K3_peaks.narrowPeak K8_peaks.narrowPeak I ...
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22 views

How to decide the parameters and parameter values when running ChIP-seq Peak Calling for H3K27ac data in MACS?

I have alignment data in SAM files from ChIP-seq analysis for H3K27ac mark. I need to call peaks using MACS2. But I'm having issues with selecting parameters and values of the parameters. I will be ...
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61 views

Peak-calling using homer

I have a total of 78 ATAC seq samples from which Im trying to do a peak call .I tried this batchParallel.pl findPeaks peaks function but i couldn't find the output ...
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45 views

Peak-calling in CLIP: What is the effect of RNA-concentration?

Question: I would like to ask how RNA-concentrations influence the diverse CLIP peak-callers in their evaluation of peaks. The peak-callers I would like to understand are: Piranha, CIMS, Paralyzer ...
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110 views

How to handle control samples in CLIP-Seq

I have a CLIP-Seq dataset I'm processing, which includes control samples and no inputs. This is the second CLIP analysis I've performed to help out users of our genome core facility and the first one ...
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50 views

What are the mathematical assumptions and algorithmic procedure behind MACS2?

I wonder if there's some mathematical details that outline what the algorithms does.
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1answer
73 views

Occupancy of TFs with the target genes

The occupancy of SMARCD3 in the target genes listed below. I want to see average, normalized ChIP-seq signal at the promoter proximal region (1000bp upstream and downstream of the TSS). I have 4 ...
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1answer
52 views

Detecting broad peaks in sRNA-seq data

What kind of tool would be appropriate do detect "broad peaks" in small RNA-seq sequencing data? MACS2 appears to be developed for ChIP-seq data, but I see that there is a ...
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1answer
78 views

Score predefined ChIP-seq peaks with MACS2 or equivalent

I have performed peak calling on a number of separate ChIP-seq experiments and would like to harmonise the peaks from each of the experiments in order to convert my data into a matrix for further ...
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1answer
471 views

determine if ChIP-seq peaks are broad or narrow

Is there a method to determine if the peaks are broad or narrow? ENCODE provides some guidelines: Although those cover common histone marks, there are many others. If you are using one of the ones ...
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74 views

Finding peaks and estimating cell population sizes in multi-dimensional flow cytometry data

Our research institute processes a lot of flow cytometry data, but the produced data is under-utilised due to the effort required to process it. A typical run will produce 5 million events (ideally ...