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
10693874
13070142
14511745
Distinct Fragments
10066593
12188804
13757901
Positions with Two Read
533594
737807
661301
NRF = Distinct/Total
0.941342
0.932569
0.948053
PBC1 = OneRead/Distinct
0.943333
0.934841
0.949347
PBC2 = OneRead/TwoRead
17.796581
15.443869
19.750502
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
23995
1765
N1
12627
789
N2
14796
907
Np
24489
1699
N optimal
24489
1765
N conservative
23995
1765
Optimal Set
pooled-pr1_vs_pooled-pr2
rep1_vs_rep2
Conservative Set
rep1_vs_rep2
rep1_vs_rep2
Rescue Ratio
1.0205876224213377
1.038846380223661
Self Consistency Ratio
1.1717747683535282
1.149556400506971
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
33821
42807
Top 300000 raw peaks from spp with FDR 0.01
Peak calling statistics
Peak region size
rep1
rep2
idr_opt
overlap_opt
Min size
128.0
120.0
122.0
122.0
25 percentile
510.0
480.0
490.0
490.0
50 percentile (median)
510.0
480.0
490.0
490.0
75 percentile
510.0
480.0
490.0
490.0
Max size
527.0
534.0
578.0
578.0
Mean
508.9965701782916
479.1068283224706
452.3371104815864
487.1866960676222
Enrichment / Signal-to-noise ratio
Strand cross-correlation measures (trimmed/filtered SE BAM)
rep1
rep2
Number of Subsampled Reads
10693874
13070142
Estimated Fragment Length
180
165
Cross-correlation at Estimated Fragment Length
0.800797739618365
0.830016804809862
Phantom Peak
50
50
Cross-correlation at Phantom Peak
0.8000901
0.8288259
Argmin of Cross-correlation
1500
1500
Minimum of Cross-correlation
0.7938223
0.8223807
NSC (Normalized Strand Cross-correlation coeff.)
1.008787
1.009285
RSC (Relative Strand Cross-correlation coeff.)
1.112892
1.184765
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
0.39649868590505594
0.3970189064412118
Synthetic AUC
0.4971790468566118
0.4974359764369272
X-intercept
0.02912222233309053
0.028802921601692295
Synthetic X-intercept
0.0
0.0
Elbow Point
0.4933854857861284
0.48836248615531985
Synthetic Elbow Point
0.5050877589378018
0.5029376470765045
JS Distance
0.042333779124347555
0.041235061532211535
Synthetic JS Distance
0.15132219687488524
0.1515523751403605
% Genome Enriched
38.14925313563296
38.40908410580828
Diff. Enrichment
8.253904362186981
8.116903630662248
CHANCE Divergence
0.07024967789280667
0.06906471711391156
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
0.23284110855821785
0.2705036758344076
0.22247572769350057
0.2301492837997309
0.2131992905810924
0.22629884870716227
0.44325899253058576
0.25866406546434895
0.25864597327172906
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
0.15447709504135623
0.1001160297911543
0.10888554380901302
0.15765760130459497
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
0.021144290820865216
0.01262264987148323
0.013426534781965297
0.020946456425920773
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