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
22416240
17399623
32733145
Distinct Fragments
19965866
15860997
27374874
Positions with Two Read
1919473
1247660
3680882
NRF = Distinct/Total
0.890688
0.911571
0.836304
PBC1 = OneRead/Distinct
0.892813
0.913946
0.839235
PBC2 = OneRead/TwoRead
9.286815
11.61862
6.241424
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
13589
677
N1
8489
375
N2
7792
369
Np
13285
665
N optimal
13589
677
N conservative
13589
677
Optimal Set
rep1_vs_rep2
rep1_vs_rep2
Conservative Set
rep1_vs_rep2
rep1_vs_rep2
Rescue Ratio
1.022882950696274
1.018045112781955
Self Consistency Ratio
1.0894507186858315
1.016260162601626
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
24436
22033
Top 300000 raw peaks from spp with FDR 0.01
Peak calling statistics
Peak region size
rep1
rep2
idr_opt
overlap_opt
Min size
172.0
173.0
172.0
172.0
25 percentile
690.0
690.0
502.0
690.0
50 percentile (median)
690.0
690.0
690.0
690.0
75 percentile
690.0
690.0
690.0
690.0
Max size
690.0
690.0
705.0
705.0
Mean
688.1564495007366
688.2042844823674
597.3810930576071
684.9986018102877
Enrichment / Signal-to-noise ratio
Strand cross-correlation measures (trimmed/filtered SE BAM)
rep1
rep2
Number of Subsampled Reads
15000000
15000000
Estimated Fragment Length
245
200
Cross-correlation at Estimated Fragment Length
0.845577511942562
0.845384726788471
Phantom Peak
50
50
Cross-correlation at Phantom Peak
0.8463712
0.8462085
Argmin of Cross-correlation
1500
1500
Minimum of Cross-correlation
0.8418654
0.8417176
NSC (Normalized Strand Cross-correlation coeff.)
1.004409
1.004357
RSC (Relative Strand Cross-correlation coeff.)
0.8238575
0.8165604
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
0.41841600281009106
0.41575206449013463
Synthetic AUC
0.49799494758941043
0.49775087842422555
X-intercept
0.028358793263238632
0.028522578377169153
Synthetic X-intercept
0.0
0.0
Elbow Point
0.41911811703045604
0.4315977437601866
Synthetic Elbow Point
0.5032402828207467
0.5040286628641238
JS Distance
0.03013456880619096
0.03461749893776158
Synthetic JS Distance
0.12724276081552202
0.12916907766549499
% Genome Enriched
36.9846761049503
38.51526796842543
Diff. Enrichment
4.966205609464714
5.441166150478982
CHANCE Divergence
0.0424664838236654
0.046361776429989926
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
0.18869698572242244
0.17504118061203816
0.16748378579526685
0.1742545903113079
0.16780874216647357
0.1606859233643323
0.2577724816518203
0.18413326877018807
0.1862309865978122
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
0.100211507687677
0.06785578346193566
0.06461946671532408
0.09841814063099119
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
0.008331807588476403
0.0052562757148983804
0.005312207657320893
0.008426488804266856
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