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
6685544
5150851
5837425
Distinct Fragments
5443609
4214926
4950459
Positions with Two Read
882662
671451
679463
NRF = Distinct/Total
0.814236
0.818297
0.848055
PBC1 = OneRead/Distinct
0.807506
0.811753
0.843123
PBC2 = OneRead/TwoRead
4.980103
5.09565
6.142857
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
53597
1442
N1
34096
769
N2
29281
568
Np
55738
1553
N optimal
55738
1553
N conservative
53597
1442
Optimal Set
pooled-pr1_vs_pooled-pr2
pooled-pr1_vs_pooled-pr2
Conservative Set
rep1_vs_rep2
rep1_vs_rep2
Rescue Ratio
1.0399462656491967
1.0769764216366158
Self Consistency Ratio
1.1644411051535126
1.3538732394366197
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
109962
80175
Top 300000 raw peaks from spp with FDR 0.01
Peak calling statistics
Peak region size
rep1
rep2
idr_opt
overlap_opt
Min size
72.0
69.0
78.0
78.0
25 percentile
290.0
270.0
310.0
310.0
50 percentile (median)
290.0
270.0
310.0
310.0
75 percentile
290.0
270.0
310.0
310.0
Max size
290.0
289.0
310.0
310.0
Mean
289.9634601043997
269.96347988774556
302.3663876368319
309.7873084789551
Enrichment / Signal-to-noise ratio
Strand cross-correlation measures (trimmed/filtered SE BAM)
rep1
rep2
Number of Subsampled Reads
6305281
4859131
Estimated Fragment Length
185
160
Cross-correlation at Estimated Fragment Length
0.636910993887062
0.575861757623781
Phantom Peak
50
50
Cross-correlation at Phantom Peak
0.6359779
0.575575
Argmin of Cross-correlation
1500
1500
Minimum of Cross-correlation
0.6314056
0.5709912
NSC (Normalized Strand Cross-correlation coeff.)
1.008719
1.00853
RSC (Relative Strand Cross-correlation coeff.)
1.204078
1.06256
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
0.39481655325266507
0.39067075644216026
Synthetic AUC
0.49807417984983143
0.4978093304427261
X-intercept
0.019013204889280853
0.01943022239603494
Synthetic X-intercept
0.0
0.0
Elbow Point
0.54898459230054
0.5474202778254432
Synthetic Elbow Point
0.4997888380764194
0.49788606889327447
JS Distance
0.05330828148727697
0.05772529434890021
Synthetic JS Distance
0.15930002226050033
0.16554004560149294
% Genome Enriched
40.26932546919458
41.63331191712326
Diff. Enrichment
11.427673102733454
11.89182832445304
CHANCE Divergence
0.09720016905494987
0.10112245942957833
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
0.49751812897571446
0.3994020132159118
0.3977102219671267
0.39889780551956605
0.39954170188698346
0.40171253236708715
0.49184827979463785
0.4648474316712582
0.440722078219363
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
0.28144807796049054
0.19503532926422662
0.17363194791588646
0.2960075708316839
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
0.01571055260302464
0.009704690216353161
0.01397666142203361
0.021846341448406147
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