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
3150180
2871089
7085843
Distinct Fragments
2946825
2690744
6606347
Positions with Two Read
158293
142408
298041
NRF = Distinct/Total
0.935447
0.937186
0.93233
PBC1 = OneRead/Distinct
0.940152
0.941285
0.947185
PBC2 = OneRead/TwoRead
17.502113
17.785216
20.995219
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
2416
78
N1
6615
35
N2
6428
84
Np
2432
68
N optimal
2432
78
N conservative
2416
78
Optimal Set
pooled-pr1_vs_pooled-pr2
rep1_vs_rep2
Conservative Set
rep1_vs_rep2
rep1_vs_rep2
Rescue Ratio
1.0066225165562914
1.1470588235294117
Self Consistency Ratio
1.0290914747977598
2.4
Reproducibility Test
pass
borderline
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
20822
23073
Top 300000 raw peaks from spp with FDR 0.01
Peak calling statistics
Peak region size
rep1
rep2
idr_opt
overlap_opt
Min size
180.0
137.0
154.0
154.0
25 percentile
596.0
536.0
616.0
616.0
50 percentile (median)
596.0
536.0
616.0
616.0
75 percentile
596.0
536.0
616.0
616.0
Max size
596.0
536.0
2735.0
2735.0
Mean
595.9056766881183
535.9537121310623
764.7307692307693
620.2791940789474
Enrichment / Signal-to-noise ratio
Strand cross-correlation measures (trimmed/filtered SE BAM)
rep1
rep2
Number of Subsampled Reads
3150180
2871089
Estimated Fragment Length
110
115
Cross-correlation at Estimated Fragment Length
0.554735616599977
0.533869497444584
Phantom Peak
30
35
Cross-correlation at Phantom Peak
0.5544761
0.5331946
Argmin of Cross-correlation
1500
1500
Minimum of Cross-correlation
0.5457205
0.5236723
NSC (Normalized Strand Cross-correlation coeff.)
1.01652
1.019473
RSC (Relative Strand Cross-correlation coeff.)
1.029645
1.07087
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
0.3741651806349164
0.36839916662507033
Synthetic AUC
0.4934992570093174
0.4931957620242631
X-intercept
0.039890189255944425
0.04092565030545103
Synthetic X-intercept
1.1340510390503424e-202
7.43146531270059e-185
Elbow Point
0.4970113282231967
0.5108992749777546
Synthetic Elbow Point
0.5094267541235873
0.5120772714806637
JS Distance
0.03698854882548136
0.04283956582156772
Synthetic JS Distance
0.17935549580384283
0.18516332571333288
% Genome Enriched
37.81607498413889
38.12252357220096
Diff. Enrichment
9.167733238098863
9.037801018860764
CHANCE Divergence
0.07792286154725866
0.07682060418805657
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
0.15714085507263953
0.16735459108355477
0.20992899773477305
0.22747933274284027
0.23337092990193897
0.2196818718630056
0.03808712149231167
0.17425390404575167
0.16050036315885505
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
0.029089165185499852
0.054170052379162066
0.05333001180986124
0.028652036049592496
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
0.0069947706533830135
0.0047527991925496805
0.00651313847062297
0.007358810107017384
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