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
4696763
3421137
5597909
Distinct Fragments
1064586
1172949
5310536
Positions with Two Read
138818
275546
227870
NRF = Distinct/Total
0.226664
0.342854
0.948664
PBC1 = OneRead/Distinct
0.146115
0.257489
0.953482
PBC2 = OneRead/TwoRead
1.120546
1.096086
22.221008
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
13581
5624
N1
8401
2674
N2
8697
3119
Np
13166
5758
N optimal
13581
5758
N conservative
13581
5624
Optimal Set
rep1_vs_rep2
pooled-pr1_vs_pooled-pr2
Conservative Set
rep1_vs_rep2
rep1_vs_rep2
Rescue Ratio
1.0315205833206744
1.0238264580369842
Self Consistency Ratio
1.035233900726104
1.1664173522812267
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
29432
31222
Top 300000 raw peaks from spp with FDR 0.01
Peak calling statistics
Peak region size
rep1
rep2
idr_opt
overlap_opt
Min size
92.0
90.0
95.0
95.0
25 percentile
370.0
360.0
380.0
380.0
50 percentile (median)
370.0
360.0
380.0
380.0
75 percentile
370.0
360.0
380.0
380.0
Max size
13344.0
13344.0
13372.0
13372.0
Mean
381.1865996194618
367.6926526167446
404.82893365752
390.4145497386054
Enrichment / Signal-to-noise ratio
Strand cross-correlation measures (trimmed/filtered SE BAM)
rep1
rep2
Number of Subsampled Reads
4696763
3421137
Estimated Fragment Length
170
170
Cross-correlation at Estimated Fragment Length
0.309372943948264
0.315588531902945
Phantom Peak
40
40
Cross-correlation at Phantom Peak
0.2721021
0.2846204
Argmin of Cross-correlation
1500
1500
Minimum of Cross-correlation
0.2386388
0.2528485
NSC (Normalized Strand Cross-correlation coeff.)
1.296407
1.248133
RSC (Relative Strand Cross-correlation coeff.)
2.113781
1.974706
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
0.2192770907134926
0.22880321073050952
Synthetic AUC
0.4892235599648409
0.48973986241892803
X-intercept
0.10745521286358377
0.09183457686629694
Synthetic X-intercept
5.788692810185014e-73
1.3424840253875515e-80
Elbow Point
0.7187926425407972
0.6913837130431313
Synthetic Elbow Point
0.505595426510543
0.5146875067595511
JS Distance
0.28167060849148273
0.2701957753471537
Synthetic JS Distance
0.37462702984101476
0.36597237764103746
% Genome Enriched
25.75689263057096
24.357219806088658
Diff. Enrichment
34.1241117877528
32.33920025900765
CHANCE Divergence
0.29294559368206496
0.27806913054848553
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
0.4342953805491366
0.42867247185227164
0.3678118701503887
0.3699618307831386
0.3731662839888076
0.3633179819164662
0.4105749491610085
0.41438686864430585
0.4139544478924798
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
0.30575115954159976
0.26640192987766614
0.2591231619539642
0.3012218476204104
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
0.2107097882560942
0.14921944791028358
0.15555642980248252
0.213241093794373
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