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
1060181
1115183
5731102
Distinct Fragments
763553
1009275
5419023
Positions with Two Read
169034
82031
229040
NRF = Distinct/Total
0.72021
0.905031
0.945546
PBC1 = OneRead/Distinct
0.706007
0.909076
0.953706
PBC2 = OneRead/TwoRead
3.189145
11.184894
22.564417
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
6326
1002
N1
2029
288
N2
2704
421
Np
6444
1123
N optimal
6444
1123
N conservative
6326
1002
Optimal Set
pooled-pr1_vs_pooled-pr2
pooled-pr1_vs_pooled-pr2
Conservative Set
rep1_vs_rep2
rep1_vs_rep2
Rescue Ratio
1.0186531773632628
1.120758483033932
Self Consistency Ratio
1.3326761951700345
1.4618055555555556
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
25010
29337
Top 300000 raw peaks from spp with FDR 0.01
Peak calling statistics
Peak region size
rep1
rep2
idr_opt
overlap_opt
Min size
117.0
122.0
96.0
96.0
25 percentile
356.0
320.0
370.0
370.0
50 percentile (median)
356.0
320.0
370.0
370.0
75 percentile
356.0
320.0
370.0
370.0
Max size
356.0
320.0
370.0
370.0
Mean
355.96473410635747
319.963799979548
361.2128227960819
368.45934202358785
Enrichment / Signal-to-noise ratio
Strand cross-correlation measures (trimmed/filtered SE BAM)
rep1
rep2
Number of Subsampled Reads
1060181
1115183
Estimated Fragment Length
155
95
Cross-correlation at Estimated Fragment Length
0.223338462710836
0.303567213612694
Phantom Peak
40
40
Cross-correlation at Phantom Peak
0.2128113
0.2936133
Argmin of Cross-correlation
1500
1500
Minimum of Cross-correlation
0.2014589
0.2725903
NSC (Normalized Strand Cross-correlation coeff.)
1.108605
1.113639
RSC (Relative Strand Cross-correlation coeff.)
1.927316
1.473478
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
0.28272271910035046
0.29187719282148755
Synthetic AUC
0.48721013880034886
0.48888480580455235
X-intercept
0.09672283560709141
0.07218500237417852
Synthetic X-intercept
1.6012666500828897e-51
1.6002895558220863e-68
Elbow Point
0.5669977215866695
0.6320502128780231
Synthetic Elbow Point
0.4962192937943843
0.5148354219137579
JS Distance
0.11893800830115071
0.11893989134984927
Synthetic JS Distance
0.2583484160410411
0.2630012858365316
% Genome Enriched
34.27415976026782
33.74545614154094
Diff. Enrichment
20.72294206378632
17.76639589520086
CHANCE Divergence
0.1771923544573579
0.15164252009205786
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
0.2549936505953868
0.25243915377179815
0.17063244233491548
0.17961130714280102
0.17184247231243235
0.1745463547274199
0.2362410945777117
0.25404130414340026
0.25556602886453905
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
0.1048259440531258
0.057050961778666004
0.06572257106257907
0.10510469328628554
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
0.04004529395170138
0.017931863602298276
0.022574206071655913
0.04234189656948133
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