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
rep3
ctl1
Total Fragments
480012
1804504
1353440
4966008
Distinct Fragments
432562
1602118
1270047
4699310
Positions with Two Read
40143
166233
71700
204429
NRF = Distinct/Total
0.901148
0.887844
0.938384
0.946295
PBC1 = OneRead/Distinct
0.899106
0.885747
0.939446
0.951974
PBC2 = OneRead/TwoRead
9.688339
8.536644
16.640739
21.883485
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
6092
338
N1
1055
79
N2
7054
110
N3
5798
438
Np
5781
505
N optimal
6092
505
N conservative
6092
338
Optimal Set
rep2_vs_rep3
pooled-pr1_vs_pooled-pr2
Conservative Set
rep2_vs_rep3
rep1_vs_rep3
Rescue Ratio
1.053796920947933
1.4940828402366864
Self Consistency Ratio
6.6862559241706165
5.544303797468355
Reproducibility Test
borderline
borderline
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
rep3
Number of peaks
14947
24403
31815
Top 300000 raw peaks from spp with FDR 0.01
Peak calling statistics
Peak region size
rep1
rep2
rep3
idr_opt
overlap_opt
Min size
137.0
307.0
134.0
126.0
126.0
25 percentile
504.0
550.0
470.0
504.0
504.0
50 percentile (median)
504.0
550.0
470.0
504.0
504.0
75 percentile
504.0
550.0
470.0
504.0
504.0
Max size
548.0
5218.0
470.0
2784.0
2784.0
Mean
503.75058540175286
553.6663524976437
469.8815967311017
515.6712871287128
504.94172685489167
Enrichment / Signal-to-noise ratio
Strand cross-correlation measures (trimmed/filtered SE BAM)
rep1
rep2
rep3
Number of Subsampled Reads
480012
1804504
1353440
Estimated Fragment Length
125
170
125
Cross-correlation at Estimated Fragment Length
0.151057835364996
0.379226743892882
0.346681020463918
Phantom Peak
30
35
40
Cross-correlation at Phantom Peak
0.1489835
0.3783168
0.3424401
Argmin of Cross-correlation
1500
1500
1500
Minimum of Cross-correlation
0.1408361
0.3702117
0.3283551
NSC (Normalized Strand Cross-correlation coeff.)
1.072579
1.024351
1.055811
RSC (Relative Strand Cross-correlation coeff.)
1.254597
1.112262
1.301091
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
rep3
AUC
0.26448062572375736
0.3456761269939071
0.317092460201306
Synthetic AUC
0.48308986273516097
0.49120720527488
0.49009279683541646
X-intercept
0.17736758424915366
0.048252377409077944
0.061253069635593606
Synthetic X-intercept
3.781863340177096e-29
3.627617384347604e-110
1.6004102863065918e-86
Elbow Point
0.633808183434042
0.5522451479310008
0.5659081433367712
Synthetic Elbow Point
0.4982649828043226
0.5028803657560705
0.4943189142336573
JS Distance
0.14628806827259108
0.06817609512811215
0.10606402052673584
Synthetic JS Distance
0.23738776610427012
0.19964145642718628
0.23062905553278074
% Genome Enriched
35.66482671395884
38.819344838523705
36.599831232382634
Diff. Enrichment
27.601772086423487
13.736720107312934
16.912408559404383
CHANCE Divergence
0.23742863822155597
0.11703272703009814
0.1442543149681829
Peak enrichment
Fraction of reads in peaks (FRiP)
FRiP for spp raw peaks
rep1
rep2
rep3
rep1-pr1
rep2-pr1
rep3-pr1
rep1-pr2
rep2-pr2
rep3-pr2
pooled
pooled-pr1
pooled-pr2
Fraction of Reads in Peaks
0.19396777640884616
0.21449055330634278
0.27545718824736826
0.12337600457418761
0.2570394613710019
0.23623670846331324
0.1584454952215859
0.262204852389255
0.23255483369079438
0.14794679510039516
0.1958274993333995
0.20027680378318433
FRiP for overlap peaks
rep1_vs_rep2
rep1_vs_rep3
rep2_vs_rep3
rep1-pr1_vs_rep1-pr2
rep2-pr1_vs_rep2-pr2
rep3-pr1_vs_rep3-pr2
pooled-pr1_vs_pooled-pr2
Fraction of Reads in Peaks
0.053096988011051824
0.060924912960780266
0.07898202001535871
0.03407278329510157
0.08104984879379808
0.08342797068871521
0.07760069182989665
FRiP for IDR peaks
rep1_vs_rep2
rep1_vs_rep3
rep2_vs_rep3
rep1-pr1_vs_rep1-pr2
rep2-pr1_vs_rep2-pr2
rep3-pr1_vs_rep3-pr2
pooled-pr1_vs_pooled-pr2
Fraction of Reads in Peaks
0.015277710935031542
0.02044521155006784
0.018905453600854445
0.013817889742769433
0.01613953820542372
0.020386214136087214
0.023948601797550078
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