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
13749743
20115701
19272170
Distinct Fragments
11992973
17195514
16745690
Positions with Two Read
1302450
2144878
1936756
NRF = Distinct/Total
0.872233
0.85483
0.868905
PBC1 = OneRead/Distinct
0.876048
0.855972
0.868694
PBC2 = OneRead/TwoRead
8.066659
6.862337
7.51095
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
23383
1362
N1
43231
1767
N2
10676
709
Np
52147
3209
N optimal
52147
3209
N conservative
23383
1362
Optimal Set
pooled-pr1_vs_pooled-pr2
pooled-pr1_vs_pooled-pr2
Conservative Set
rep1_vs_rep2
rep1_vs_rep2
Rescue Ratio
2.2301244493863064
2.3560939794419973
Self Consistency Ratio
4.0493630573248405
2.4922425952045133
Reproducibility Test
fail
fail
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
59807
27558
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
158.0
136.0
136.0
25 percentile
510.0
630.0
544.0
544.0
50 percentile (median)
510.0
630.0
544.0
544.0
75 percentile
510.0
630.0
544.0
544.0
Max size
759.0
791.0
885.0
885.0
Mean
508.88394335111275
628.776761738878
519.9211592396385
542.4042610313153
Enrichment / Signal-to-noise ratio
Strand cross-correlation measures (trimmed/filtered SE BAM)
rep1
rep2
Number of Subsampled Reads
13749743
15000000
Estimated Fragment Length
235
220
Cross-correlation at Estimated Fragment Length
0.82294552231168
0.836283974747981
Phantom Peak
50
50
Cross-correlation at Phantom Peak
0.8125595
0.8359166
Argmin of Cross-correlation
1500
1500
Minimum of Cross-correlation
0.8040153
0.8311738
NSC (Normalized Strand Cross-correlation coeff.)
1.023545
1.006148
RSC (Relative Strand Cross-correlation coeff.)
2.215552
1.077456
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
0.348206661455733
0.4080879811962727
Synthetic AUC
0.4974133938514791
0.4978400370986824
X-intercept
0.028981023308176125
0.028505957287971846
Synthetic X-intercept
0.0
0.0
Elbow Point
0.5479627053213383
0.46888018156304706
Synthetic Elbow Point
0.5004396683685087
0.5020913486718602
JS Distance
0.13163115377281412
0.04362861652473152
Synthetic JS Distance
0.21410687160880643
0.13942983469982248
% Genome Enriched
39.06879075737101
35.350900130343746
Diff. Enrichment
17.036750465390288
6.543900055977192
CHANCE Divergence
0.14513777381779486
0.056112584662324744
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
0.41080497006120276
0.20967368250557775
0.4300106862057602
0.1845218384281881
0.4310935469041335
0.17783644643611138
0.40890750030715434
0.42328782120094494
0.4258440865603969
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
0.16087521378850397
0.32364429483495843
0.08998084709207874
0.3265234813300987
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
0.018521245102603934
0.02774504954517781
0.010982538134434266
0.03911936372611286
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