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
12448694
13575164
35078678
Distinct Fragments
10969471
9849780
27877383
Positions with Two Read
1069952
1849773
4087933
NRF = Distinct/Total
0.881174
0.725574
0.79471
PBC1 = OneRead/Distinct
0.888532
0.73877
0.809101
PBC2 = OneRead/TwoRead
9.109494
3.933844
5.517609
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
16980
1063
N1
8844
447
N2
11432
571
Np
15600
1074
N optimal
16980
1074
N conservative
16980
1063
Optimal Set
rep1_vs_rep2
pooled-pr1_vs_pooled-pr2
Conservative Set
rep1_vs_rep2
rep1_vs_rep2
Rescue Ratio
1.0884615384615384
1.0103480714957667
Self Consistency Ratio
1.2926277702397104
1.2774049217002237
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
24329
30859
Top 300000 raw peaks from spp with FDR 0.01
Peak calling statistics
Peak region size
rep1
rep2
idr_opt
overlap_opt
Min size
178.0
190.0
185.0
185.0
25 percentile
710.0
760.0
405.25
740.0
50 percentile (median)
710.0
760.0
740.0
740.0
75 percentile
710.0
760.0
740.0
740.0
Max size
2639.0
6718.0
3691.0
3691.0
Mean
708.704097990053
758.6367024206877
721.7225325884543
735.3190223792698
Enrichment / Signal-to-noise ratio
Strand cross-correlation measures (trimmed/filtered SE BAM)
rep1
rep2
Number of Subsampled Reads
12448694
13575164
Estimated Fragment Length
220
205
Cross-correlation at Estimated Fragment Length
0.807109002712063
0.762579986368036
Phantom Peak
50
50
Cross-correlation at Phantom Peak
0.8064606
0.7619732
Argmin of Cross-correlation
1500
1500
Minimum of Cross-correlation
0.7992614
0.7541815
NSC (Normalized Strand Cross-correlation coeff.)
1.009819
1.011136
RSC (Relative Strand Cross-correlation coeff.)
1.090069
1.07787
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
0.39501579791799485
0.38492385446061833
Synthetic AUC
0.4972968549334928
0.49714768634924567
X-intercept
0.028935476524386588
0.029055341795821497
Synthetic X-intercept
0.0
0.0
Elbow Point
0.4992248712447209
0.5208845257930087
Synthetic Elbow Point
0.5039228946288916
0.5045775947752932
JS Distance
0.07394234671130824
0.08871176815264187
Synthetic JS Distance
0.15715432305211577
0.16945249115637803
% Genome Enriched
34.00038356886859
33.46578445826891
Diff. Enrichment
8.698192151478167
9.9280283105044
CHANCE Divergence
0.07475594830789516
0.0852532359521269
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
0.21383837659439542
0.27072350731783884
0.18742259642092404
0.2213585602345972
0.18715703070223658
0.21972294987814156
0.3391097044962977
0.22167559249802485
0.22895663415847536
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
0.14752722303579
0.09087553322465586
0.117663605276776
0.13848187725638
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
0.021442181653630325
0.011792555859810424
0.015960150895308854
0.021671748248871477
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