Open chromatin assays are known to have significant GC bias. Please take this
into consideration as necessary.
Library complexity quality metrics
Library complexity (filtered non-mito BAM)
rep1
rep2
ctl1
Total Fragments
6519759
6830155
6015250
Distinct Fragments
5514851
5857540
5232069
Positions with Two Read
750203
743944
614968
NRF = Distinct/Total
0.845867
0.8576
0.869801
PBC1 = OneRead/Distinct
0.842525
0.854752
0.867366
PBC2 = OneRead/TwoRead
6.193522
6.730001
7.379436
Mitochondrial reads are filtered out by default.
The non-redundant fraction (NRF) is the fraction of non-redundant mapped reads
in a dataset; it is the ratio between the number of positions in the genome
that uniquely mapped reads map to and the total number of uniquely mappable
reads. The NRF should be > 0.8. The PBC1 is the ratio of genomic locations
with EXACTLY one read pair over the genomic locations with AT LEAST one read
pair. PBC1 is the primary measure, and the PBC1 should be close to 1.
Provisionally 0-0.5 is severe bottlenecking, 0.5-0.8 is moderate bottlenecking,
0.8-0.9 is mild bottlenecking, and 0.9-1.0 is no bottlenecking. The PBC2 is
the ratio of genomic locations with EXACTLY one read pair over the genomic
locations with EXACTLY two read pairs. The PBC2 should be significantly
greater than 1. See more details at
the ENCODE portal standard for ChIP-Seq pipeline
NRF (non redundant fraction)
PBC1 (PCR Bottleneck coefficient 1)
PBC2 (PCR Bottleneck coefficient 2)
PBC1 is the primary measure. Provisionally
0-0.5 is severe bottlenecking
0.5-0.8 is moderate bottlenecking
0.8-0.9 is mild bottlenecking
0.9-1.0 is no bottlenecking
Replication quality metrics
IDR (Irreproducible Discovery Rate) plots
Reproducibility QC and peak detection statistics
overlap
idr
Nt
67180
2917
N1
35671
1370
N2
31808
2173
Np
67689
3243
N optimal
67689
3243
N conservative
67180
2917
Optimal Set
pooled-pr1_vs_pooled-pr2
pooled-pr1_vs_pooled-pr2
Conservative Set
rep1_vs_rep2
rep1_vs_rep2
Rescue Ratio
1.0075766597201548
1.1117586561535824
Self Consistency Ratio
1.121447434607646
1.5861313868613138
Reproducibility Test
pass
pass
Reproducibility QC
N1: Replicate 1 self-consistent peaks (comparing two pseudoreplicates generated by subsampling Rep1 reads)
N2: Replicate 2 self-consistent peaks (comparing two pseudoreplicates generated by subsampling Rep2 reads)
Ni: Replicate i self-consistent peaks (comparing two pseudoreplicates generated by subsampling RepX reads)
Nt: True Replicate consistent peaks (comparing true replicates Rep1 vs Rep2)
Np: Pooled-pseudoreplicate consistent peaks (comparing two pseudoreplicates generated by subsampling pooled reads from Rep1 and Rep2)
Self-consistency Ratio: max(N1,N2) / min (N1,N2)
Rescue Ratio: max(Np,Nt) / min (Np,Nt)
Reproducibility Test: If Self-consistency Ratio >2 AND Rescue Ratio > 2, then 'Fail' else 'Pass'
Number of raw peaks
rep1
rep2
Number of peaks
112920
103781
Top 300000 raw peaks from spp with FDR 0.01
Peak calling statistics
Peak region size
rep1
rep2
idr_opt
overlap_opt
Min size
71.0
74.0
80.0
80.0
25 percentile
284.0
296.0
320.0
320.0
50 percentile (median)
284.0
296.0
320.0
320.0
75 percentile
284.0
296.0
320.0
320.0
Max size
560.0
569.0
818.0
818.0
Mean
283.81347856889835
295.55796340370586
301.358926919519
319.1188376250203
Enrichment / Signal-to-noise ratio
Strand cross-correlation measures (trimmed/filtered SE BAM)
rep1
rep2
Number of Subsampled Reads
6146179
6443952
Estimated Fragment Length
155
155
Cross-correlation at Estimated Fragment Length
0.64445568057705
0.661217938199859
Phantom Peak
50
50
Cross-correlation at Phantom Peak
0.643139
0.6591066
Argmin of Cross-correlation
1500
1500
Minimum of Cross-correlation
0.637237
0.6514937
NSC (Normalized Strand Cross-correlation coeff.)
1.011328
1.014926
RSC (Relative Strand Cross-correlation coeff.)
1.223099
1.277339
Performed on subsampled (15000000) reads mapped from FASTQs that are trimmed to 50.
Such FASTQ trimming and subsampling reads are for cross-corrleation analysis only.
Untrimmed FASTQs are used for all the other analyses.
NOTE1: For SE datasets, reads from replicates are randomly subsampled to 15000000.
NOTE2: For PE datasets, the first end (R1) of each read-pair is selected and trimmed to 50 the reads are then randomly subsampled to 15000000.
Normalized strand cross-correlation coefficient (NSC) = col9 in outFile
Relative strand cross-correlation coefficient (RSC) = col10 in outFile
Estimated fragment length = col3 in outFile, take the top value
Jensen-Shannon distance (filtered/deduped BAM)
rep1
rep2
AUC
0.3952003268799152
0.38872290038994145
Synthetic AUC
0.49808245866552153
0.49813980595187096
X-intercept
0.0196011120802007
0.019549220326399133
Synthetic X-intercept
0.0
0.0
Elbow Point
0.5609478627582862
0.5909492798023324
Synthetic Elbow Point
0.5023137615050399
0.5012564988756008
JS Distance
0.06335719897264144
0.07776829718299734
Synthetic JS Distance
0.15860787850134278
0.17127454948061013
% Genome Enriched
41.10226068421273
38.1342519504314
Diff. Enrichment
11.306499547386133
12.012954505981554
CHANCE Divergence
0.09613811141958581
0.10235625850139288
Peak enrichment
Fraction of reads in peaks (FRiP)
FRiP for spp raw peaks
rep1
rep2
rep1-pr1
rep2-pr1
rep1-pr2
rep2-pr2
pooled
pooled-pr1
pooled-pr2
Fraction of Reads in Peaks
0.5059283358502965
0.48367059939804335
0.4089766081976745
0.3797400982880303
0.3974457640755309
0.38205466273161737
0.4790065978689722
0.49358219316551055
0.4957903631606803
FRiP for overlap peaks
rep1_vs_rep2
rep1-pr1_vs_rep1-pr2
rep2-pr1_vs_rep2-pr2
pooled-pr1_vs_pooled-pr2
Fraction of Reads in Peaks
0.34659469759184774
0.2036268240322849
0.19906381516936833
0.34907575667562457
FRiP for IDR peaks
rep1_vs_rep2
rep1-pr1_vs_rep1-pr2
rep2-pr1_vs_rep2-pr2
pooled-pr1_vs_pooled-pr2
Fraction of Reads in Peaks
0.03636699597767628
0.01926562711492942
0.03234546227411154
0.03921970938623743
For spp raw peaks:
repX: Peak from true replicate X
repX-prY: Peak from Yth pseudoreplicates from replicate X
pooled: Peak from pooled true replicates (pool of rep1, rep2, ...)
pooled-pr1: Peak from 1st pooled pseudo replicate (pool of rep1-pr1, rep2-pr1, ...)
pooled-pr2: Peak from 2nd pooled pseudo replicate (pool of rep1-pr2, rep2-pr2, ...)
For overlap/IDR peaks:
repX_vs_repY: Comparing two peaks from true replicates X and Y
repX-pr1_vs_repX-pr2: Comparing two peaks from both pseudoreplicates from replicate X
pooled-pr1_vs_pooled-pr2: Comparing two peaks from 1st and 2nd pooled pseudo replicates