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
13482893
13125413
20756042
Distinct Fragments
11514886
11310289
17567285
Positions with Two Read
1432913
1332504
2282289
NRF = Distinct/Total
0.854037
0.861709
0.84637
PBC1 = OneRead/Distinct
0.856071
0.864377
0.847944
PBC2 = OneRead/TwoRead
6.879383
7.336832
6.526811
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
8940
990
N1
8391
510
N2
7703
592
Np
8735
1022
N optimal
8940
1022
N conservative
8940
990
Optimal Set
rep1_vs_rep2
pooled-pr1_vs_pooled-pr2
Conservative Set
rep1_vs_rep2
rep1_vs_rep2
Rescue Ratio
1.023468803663423
1.0323232323232323
Self Consistency Ratio
1.0893158509671557
1.1607843137254903
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
20743
18606
Top 300000 raw peaks from spp with FDR 0.01
Peak calling statistics
Peak region size
rep1
rep2
idr_opt
overlap_opt
Min size
131.0
136.0
135.0
135.0
25 percentile
524.0
540.0
540.0
540.0
50 percentile (median)
524.0
540.0
540.0
540.0
75 percentile
524.0
540.0
540.0
540.0
Max size
524.0
540.0
932.0
932.0
Mean
523.2477944366774
538.860206385037
504.8679060665362
535.5513422818792
Enrichment / Signal-to-noise ratio
Strand cross-correlation measures (trimmed/filtered SE BAM)
rep1
rep2
Number of Subsampled Reads
13482893
13125413
Estimated Fragment Length
230
220
Cross-correlation at Estimated Fragment Length
0.81002748276839
0.80789291769311
Phantom Peak
50
50
Cross-correlation at Phantom Peak
0.8090876
0.8067372
Argmin of Cross-correlation
1500
1500
Minimum of Cross-correlation
0.8046948
0.8024917
NSC (Normalized Strand Cross-correlation coeff.)
1.006627
1.006731
RSC (Relative Strand Cross-correlation coeff.)
1.213964
1.272211
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
0.40346228181276944
0.4037685145646443
Synthetic AUC
0.49736109969686265
0.49733768562628017
X-intercept
0.028866497936111266
0.028986259371332306
Synthetic X-intercept
0.0
0.0
Elbow Point
0.4665805715015689
0.47219937883735597
Synthetic Elbow Point
0.49914919935382807
0.5015554864952905
JS Distance
0.04936238534000758
0.05030747569117049
Synthetic JS Distance
0.143655779284794
0.14354064969048072
% Genome Enriched
36.774145901364484
35.83401863487932
Diff. Enrichment
6.959918271710109
7.000615130519483
CHANCE Divergence
0.059405626828084514
0.05989362071281266
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
0.1575380732250076
0.14762462319177505
0.185563214611321
0.17571915494693133
0.18231862533076618
0.170773362198207
0.14154672894314324
0.15139194777510206
0.15495108770533214
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
0.07709592071261613
0.07186058100900279
0.06954330410658961
0.07557770414774928
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
0.014541724077283215
0.008703281396097592
0.00991709292311038
0.014946625567947933
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