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
6483527
5229149
6021281
Distinct Fragments
5724172
4663366
5255164
Positions with Two Read
621833
471933
621514
NRF = Distinct/Total
0.882879
0.891802
0.872765
PBC1 = OneRead/Distinct
0.879938
0.889193
0.868647
PBC2 = OneRead/TwoRead
8.100114
8.786489
7.344777
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
66538
2742
N1
37919
1393
N2
36511
1276
Np
66748
2713
N optimal
66748
2742
N conservative
66538
2742
Optimal Set
pooled-pr1_vs_pooled-pr2
rep1_vs_rep2
Conservative Set
rep1_vs_rep2
rep1_vs_rep2
Rescue Ratio
1.0031560912561244
1.0106892738665685
Self Consistency Ratio
1.0385637205225822
1.091692789968652
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
109986
111731
Top 300000 raw peaks from spp with FDR 0.01
Peak calling statistics
Peak region size
rep1
rep2
idr_opt
overlap_opt
Min size
66.0
61.0
80.0
80.0
25 percentile
264.0
244.0
320.0
320.0
50 percentile (median)
264.0
244.0
320.0
320.0
75 percentile
264.0
244.0
320.0
320.0
Max size
1215.0
675.0
1400.0
1400.0
Mean
263.8201680213845
243.8504175206523
306.6232676878191
319.45285251992567
Enrichment / Signal-to-noise ratio
Strand cross-correlation measures (trimmed/filtered SE BAM)
rep1
rep2
Number of Subsampled Reads
6114569
4918795
Estimated Fragment Length
135
120
Cross-correlation at Estimated Fragment Length
0.66141696247685
0.615571691270689
Phantom Peak
50
55
Cross-correlation at Phantom Peak
0.6613881
0.6156872
Argmin of Cross-correlation
1500
1500
Minimum of Cross-correlation
0.6532624
0.6074572
NSC (Normalized Strand Cross-correlation coeff.)
1.012483
1.013358
RSC (Relative Strand Cross-correlation coeff.)
1.003546
0.9859671
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
0.38696676179368045
0.38250182359201024
Synthetic AUC
0.49808399908947254
0.4978637988883801
X-intercept
0.019856633113280595
0.020355543493011264
Synthetic X-intercept
0.0
0.0
Elbow Point
0.5941603537873285
0.5928671780830665
Synthetic Elbow Point
0.4984016391357862
0.49868551791296734
JS Distance
0.08994283071753863
0.09523106782331772
Synthetic JS Distance
0.17359211496099372
0.17774125613729597
% Genome Enriched
37.952711278567605
37.72281337558772
Diff. Enrichment
12.050861820761982
12.753184378958949
CHANCE Divergence
0.1026754795592527
0.10866468036272642
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
0.4753790989690786
0.4752716596877473
0.3971698712728634
0.41831286250426475
0.4084436097771367
0.4118199470402367
0.4590011898845363
0.47740301049467915
0.47556463294934437
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
0.34496047579303224
0.20715045229345022
0.19678729460663907
0.34558752666425685
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
0.03494746295619458
0.020183132921733387
0.019153343388208673
0.03453387926571884
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