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
6209675
6196092
8366263
Distinct Fragments
5518840
5462047
7200757
Positions with Two Read
573479
600902
925649
NRF = Distinct/Total
0.888749
0.881531
0.86069
PBC1 = OneRead/Distinct
0.885978
0.878405
0.855654
PBC2 = OneRead/TwoRead
8.526152
7.98448
6.656256
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
55134
2134
N1
29723
1219
N2
31254
1110
Np
60151
2269
N optimal
60151
2269
N conservative
55134
2134
Optimal Set
pooled-pr1_vs_pooled-pr2
pooled-pr1_vs_pooled-pr2
Conservative Set
rep1_vs_rep2
rep1_vs_rep2
Rescue Ratio
1.0909964813001052
1.063261480787254
Self Consistency Ratio
1.0515089324765334
1.0981981981981983
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
106658
88182
Top 300000 raw peaks from spp with FDR 0.01
Peak calling statistics
Peak region size
rep1
rep2
idr_opt
overlap_opt
Min size
76.0
68.0
81.0
81.0
25 percentile
304.0
270.0
324.0
324.0
50 percentile (median)
304.0
270.0
324.0
324.0
75 percentile
304.0
270.0
324.0
324.0
Max size
1575.0
1648.0
1699.0
1699.0
Mean
303.9029702413321
269.9452722777891
320.33142353459675
323.8669182557231
Enrichment / Signal-to-noise ratio
Strand cross-correlation measures (trimmed/filtered SE BAM)
rep1
rep2
Number of Subsampled Reads
5831465
5815421
Estimated Fragment Length
135
125
Cross-correlation at Estimated Fragment Length
0.6518656728163
0.648206529958199
Phantom Peak
50
50
Cross-correlation at Phantom Peak
0.6520072
0.6484494
Argmin of Cross-correlation
1500
1500
Minimum of Cross-correlation
0.6426176
0.6387567
NSC (Normalized Strand Cross-correlation coeff.)
1.014391
1.014794
RSC (Relative Strand Cross-correlation coeff.)
0.9849236
0.9749386
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
0.39345418271370436
0.39388554863360964
Synthetic AUC
0.49807105373751714
0.4980392397358241
X-intercept
0.019721160871492054
0.019978679826084873
Synthetic X-intercept
0.0
0.0
Elbow Point
0.5713467243189722
0.565341941253738
Synthetic Elbow Point
0.5013258906656667
0.4992822674645325
JS Distance
0.0859456740321949
0.08516159465823189
Synthetic JS Distance
0.16765376509292115
0.16608978069498795
% Genome Enriched
39.14627475875066
39.234310308344014
Diff. Enrichment
11.334213701813106
11.254355312847174
CHANCE Divergence
0.0964896168935321
0.09580217638416358
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
0.498101139586024
0.4135702343858975
0.3721769339039146
0.38790539818006836
0.3876100324881802
0.37570694419337347
0.4766078172365936
0.4989502521329983
0.4660225727069796
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
0.2976925526754876
0.1871736277460232
0.1788097915367488
0.3180152012271807
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
0.032477309563278045
0.023889257482270797
0.02126524483115635
0.03349350980988609
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