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
9582775
8843144
9554715
Distinct Fragments
7837086
7279170
7822740
Positions with Two Read
1237303
1130114
1241145
NRF = Distinct/Total
0.817831
0.823143
0.818731
PBC1 = OneRead/Distinct
0.812332
0.817251
0.812345
PBC2 = OneRead/TwoRead
5.145315
5.263988
5.120079
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
55709
1077
N1
32966
585
N2
35964
421
Np
58377
1200
N optimal
58377
1200
N conservative
55709
1077
Optimal Set
pooled-pr1_vs_pooled-pr2
pooled-pr1_vs_pooled-pr2
Conservative Set
rep1_vs_rep2
rep1_vs_rep2
Rescue Ratio
1.0478917230609057
1.1142061281337048
Self Consistency Ratio
1.0909421828550627
1.3895486935866983
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
100146
98862
Top 300000 raw peaks from spp with FDR 0.01
Peak calling statistics
Peak region size
rep1
rep2
idr_opt
overlap_opt
Min size
66.0
59.0
68.0
68.0
25 percentile
264.0
230.0
270.0
270.0
50 percentile (median)
264.0
230.0
270.0
270.0
75 percentile
264.0
230.0
270.0
270.0
Max size
264.0
230.0
282.0
282.0
Mean
263.92722624967547
229.97104044020958
260.85833333333335
269.8148243315004
Enrichment / Signal-to-noise ratio
Strand cross-correlation measures (trimmed/filtered SE BAM)
rep1
rep2
Number of Subsampled Reads
9040791
8330944
Estimated Fragment Length
145
130
Cross-correlation at Estimated Fragment Length
0.715994153263462
0.701256236011763
Phantom Peak
50
50
Cross-correlation at Phantom Peak
0.7160539
0.7014918
Argmin of Cross-correlation
1500
1500
Minimum of Cross-correlation
0.7113281
0.6967617
NSC (Normalized Strand Cross-correlation coeff.)
1.00656
1.006451
RSC (Relative Strand Cross-correlation coeff.)
0.9873483
0.9501897
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
0.4147327862267485
0.41273735290809
Synthetic AUC
0.4983892077505797
0.49830598798237813
X-intercept
0.019136281871342694
0.019483669773858462
Synthetic X-intercept
0.0
0.0
Elbow Point
0.5186760927246192
0.5139823630762597
Synthetic Elbow Point
0.5023343369559564
0.5005289923518184
JS Distance
0.043211018202486816
0.044158323802020776
Synthetic JS Distance
0.13089422926513666
0.13258629584892523
% Genome Enriched
43.877887162819114
43.996478205402084
Diff. Enrichment
8.171774608071825
8.471532512347608
CHANCE Divergence
0.06946004693901975
0.07202089883692503
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
0.4355631196806804
0.40095886156473803
0.3685224775191773
0.3761710642086204
0.3716094207166929
0.39374897512177404
0.527374252054133
0.3741386038196301
0.5094655919157788
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
0.25233065098108676
0.16530029597921855
0.16304048032323046
0.26236990183070474
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
0.010002944077291385
0.00657926417495237
0.0045073419596928285
0.010923561263428234
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