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
1213393
4436900
7190948
Distinct Fragments
1143639
3803640
6506760
Positions with Two Read
55059
427123
378652
NRF = Distinct/Total
0.942513
0.857274
0.904854
PBC1 = OneRead/Distinct
0.946863
0.867834
0.929963
PBC2 = OneRead/TwoRead
19.667448
7.728287
15.980486
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
14680
174
N1
5092
57
N2
12305
91
Np
10298
160
N optimal
14680
174
N conservative
14680
174
Optimal Set
rep1_vs_rep2
rep1_vs_rep2
Conservative Set
rep1_vs_rep2
rep1_vs_rep2
Rescue Ratio
1.4255195183530782
1.0875
Self Consistency Ratio
2.416535742340927
1.5964912280701755
Reproducibility Test
borderline
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
24946
59920
Top 300000 raw peaks from spp with FDR 0.01
Peak calling statistics
Peak region size
rep1
rep2
idr_opt
overlap_opt
Min size
150.0
129.0
138.0
138.0
25 percentile
600.0
516.0
550.0
550.0
50 percentile (median)
600.0
516.0
550.0
550.0
75 percentile
600.0
516.0
550.0
550.0
Max size
3094.0
2884.0
5023.0
5023.0
Mean
600.9848873566905
516.0966121495327
1299.3333333333333
558.9502043596731
Enrichment / Signal-to-noise ratio
Strand cross-correlation measures (trimmed/filtered SE BAM)
rep1
rep2
Number of Subsampled Reads
1213393
4436900
Estimated Fragment Length
115
120
Cross-correlation at Estimated Fragment Length
0.344598354206334
0.592551945435606
Phantom Peak
30
25
Cross-correlation at Phantom Peak
0.3410739
0.5904622
Argmin of Cross-correlation
1500
1500
Minimum of Cross-correlation
0.3272905
0.5818562
NSC (Normalized Strand Cross-correlation coeff.)
1.052882
1.018382
RSC (Relative Strand Cross-correlation coeff.)
1.255704
1.242826
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
0.3215663261069973
0.3688804893882902
Synthetic AUC
0.4895740353265537
0.49427431135164274
X-intercept
0.05959297685554669
0.03851755786113328
Synthetic X-intercept
5.069315092448979e-78
1.0016140404406081e-261
Elbow Point
0.5477833200319234
0.5063208300079809
Synthetic Elbow Point
0.5139158535922176
0.5045775084406918
JS Distance
0.09195370244438668
0.045096474366276874
Synthetic JS Distance
0.2319040063068602
0.18648380939924256
% Genome Enriched
35.024341580207505
37.88687150837989
Diff. Enrichment
15.227647949283607
10.331377375233009
CHANCE Divergence
0.12963244406545077
0.08782602803477747
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
0.22230468030338807
0.3507861153663172
0.2232247886076475
0.24472684417257629
0.24161910907137704
0.22249818225567686
0.40494328419114606
0.1988526710962361
0.19081437283038147
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
0.10866855009796038
0.06193005536512352
0.08719651851051716
0.07985980298676752
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
0.010502726744751147
0.011214010723586961
0.005339982178263916
0.010413562311881121
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