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
1701051
2665031
2329076
Distinct Fragments
1375063
1923140
2271932
Positions with Two Read
212574
414238
41647
NRF = Distinct/Total
0.808361
0.72162
0.975465
PBC1 = OneRead/Distinct
0.812799
0.715284
0.979464
PBC2 = OneRead/TwoRead
5.257698
3.320775
53.43182
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
8579
2579
N1
6488
1754
N2
8928
2016
Np
8485
2696
N optimal
8579
2696
N conservative
8579
2579
Optimal Set
rep1_vs_rep2
pooled-pr1_vs_pooled-pr2
Conservative Set
rep1_vs_rep2
rep1_vs_rep2
Rescue Ratio
1.0110783736004714
1.045366421093447
Self Consistency Ratio
1.376078914919852
1.1493728620296466
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
28301
25352
Top 300000 raw peaks from spp with FDR 0.01
Peak calling statistics
Peak region size
rep1
rep2
idr_opt
overlap_opt
Min size
87.0
80.0
85.0
85.0
25 percentile
344.0
320.0
340.0
340.0
50 percentile (median)
344.0
320.0
340.0
340.0
75 percentile
344.0
320.0
340.0
340.0
Max size
344.0
320.0
371.0
371.0
Mean
343.66987032260346
319.74431997475546
332.9992581602374
337.82632008392585
Enrichment / Signal-to-noise ratio
Strand cross-correlation measures (trimmed/filtered SE BAM)
rep1
rep2
Number of Subsampled Reads
1701051
2665031
Estimated Fragment Length
130
120
Cross-correlation at Estimated Fragment Length
0.376605785209803
0.432667707500818
Phantom Peak
40
40
Cross-correlation at Phantom Peak
0.3517601
0.4113168
Argmin of Cross-correlation
1500
1500
Minimum of Cross-correlation
0.3180086
0.3771905
NSC (Normalized Strand Cross-correlation coeff.)
1.184263
1.14708
RSC (Relative Strand Cross-correlation coeff.)
1.736134
1.625641
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
0.27172657940756023
0.28537588139434267
Synthetic AUC
0.49045587498996135
0.49194086365515194
X-intercept
0.06003410688819523
0.05059188415625343
Synthetic X-intercept
2.5533074090517976e-93
2.260757353697914e-131
Elbow Point
0.6592482522712994
0.6639713581921355
Synthetic Elbow Point
0.5019415277751043
0.502623596496679
JS Distance
0.1207019661396522
0.09952757849732587
Synthetic JS Distance
0.31082389971847385
0.2967752021714824
% Genome Enriched
33.40221196134553
32.67340161359488
Diff. Enrichment
17.238263658372176
15.027362087777846
CHANCE Divergence
0.14794272802503902
0.1284167772239071
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
0.29629712942269176
0.25422960779835635
0.2819159434592053
0.2938913666277916
0.2802426494064378
0.293017498977198
0.20705837343246228
0.2677380985478796
0.26385622633412814
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
0.1599741439567543
0.15130540156154762
0.14765421127505282
0.1596248033070109
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
0.09239697548359957
0.08001190026993295
0.07345061111741191
0.09500615123609475
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