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
3167963
1478682
4903688
Distinct Fragments
2540909
1206911
4737924
Positions with Two Read
401102
176282
118200
NRF = Distinct/Total
0.802064
0.816207
0.966196
PBC1 = OneRead/Distinct
0.807945
0.82331
0.972842
PBC2 = OneRead/TwoRead
5.118184
5.636775
38.995347
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
15394
2482
N1
12121
1154
N2
8080
847
Np
14975
2390
N optimal
15394
2482
N conservative
15394
2482
Optimal Set
rep1_vs_rep2
rep1_vs_rep2
Conservative Set
rep1_vs_rep2
rep1_vs_rep2
Rescue Ratio
1.0279799666110183
1.0384937238493723
Self Consistency Ratio
1.5001237623762376
1.3624557260920898
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
35539
32073
Top 300000 raw peaks from spp with FDR 0.01
Peak calling statistics
Peak region size
rep1
rep2
idr_opt
overlap_opt
Min size
106.0
109.0
109.0
109.0
25 percentile
424.0
436.0
436.0
436.0
50 percentile (median)
424.0
436.0
436.0
436.0
75 percentile
424.0
436.0
436.0
436.0
Max size
2633.0
2672.0
2679.0
2679.0
Mean
423.83091814626187
435.6933246032488
419.8388396454472
433.3829414057425
Enrichment / Signal-to-noise ratio
Strand cross-correlation measures (trimmed/filtered SE BAM)
rep1
rep2
Number of Subsampled Reads
3167963
1478682
Estimated Fragment Length
140
120
Cross-correlation at Estimated Fragment Length
0.484658050953887
0.333192854002568
Phantom Peak
30
30
Cross-correlation at Phantom Peak
0.4731402
0.3172509
Argmin of Cross-correlation
1500
1500
Minimum of Cross-correlation
0.4577137
0.2941606
NSC (Normalized Strand Cross-correlation coeff.)
1.058867
1.13269
RSC (Relative Strand Cross-correlation coeff.)
1.746635
1.690416
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
0.3112394939293495
0.2567872035052553
Synthetic AUC
0.493002077501272
0.48985799981138334
X-intercept
0.04409910628790297
0.07412823172677944
Synthetic X-intercept
1.1031910398948307e-174
1.6319097626487708e-82
Elbow Point
0.6353275614427066
0.688531359719119
Synthetic Elbow Point
0.5020760045626348
0.5021113450610487
JS Distance
0.11500872114600948
0.19195807470115267
Synthetic JS Distance
0.25899885579858306
0.32270688919525603
% Genome Enriched
30.77322055537823
28.328279604213215
Diff. Enrichment
16.6563441045535
25.121012484194722
CHANCE Divergence
0.1419155977689644
0.21451154855801816
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
0.3116407553171089
0.37144036453811957
0.30801628768558176
0.30873705624330494
0.3058833178413254
0.31200309241539265
0.35847450478155174
0.32077733944658143
0.3235673984374504
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
0.20772241163788144
0.1630632140071651
0.17973845503713193
0.20444462309133937
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
0.07673330754118787
0.04152338192223978
0.051762742291073596
0.07518868770251484
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