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
6948067
9578237
7039376
Distinct Fragments
6085160
8453074
6023188
Positions with Two Read
697298
915725
793762
NRF = Distinct/Total
0.875806
0.882529
0.855642
PBC1 = OneRead/Distinct
0.872532
0.880011
0.850773
PBC2 = OneRead/TwoRead
7.614384
8.123398
6.455793
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
71244
2572
N1
29630
1217
N2
58728
1877
Np
74788
2935
N optimal
74788
2935
N conservative
71244
2572
Optimal Set
pooled-pr1_vs_pooled-pr2
pooled-pr1_vs_pooled-pr2
Conservative Set
rep1_vs_rep2
rep1_vs_rep2
Rescue Ratio
1.0497445398910785
1.1411353032659408
Self Consistency Ratio
1.9820452244346947
1.542317173377157
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
110633
121653
Top 300000 raw peaks from spp with FDR 0.01
Peak calling statistics
Peak region size
rep1
rep2
idr_opt
overlap_opt
Min size
78.0
62.0
76.0
76.0
25 percentile
310.0
250.0
304.0
304.0
50 percentile (median)
310.0
250.0
304.0
304.0
75 percentile
310.0
250.0
304.0
304.0
Max size
1890.0
1163.0
1623.0
1623.0
Mean
309.853009499878
249.83662548395847
292.5161839863714
303.5425201904049
Enrichment / Signal-to-noise ratio
Strand cross-correlation measures (trimmed/filtered SE BAM)
rep1
rep2
Number of Subsampled Reads
6470641
8902333
Estimated Fragment Length
160
135
Cross-correlation at Estimated Fragment Length
0.668670804849711
0.738066300623505
Phantom Peak
50
50
Cross-correlation at Phantom Peak
0.667683
0.7372111
Argmin of Cross-correlation
1500
1500
Minimum of Cross-correlation
0.6611888
0.7285628
NSC (Normalized Strand Cross-correlation coeff.)
1.011316
1.013044
RSC (Relative Strand Cross-correlation coeff.)
1.1521
1.09888
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
0.3992731910290915
0.3957568773315546
Synthetic AUC
0.49817215646314067
0.498416456852257
X-intercept
0.01935382115184584
0.01975111952292252
Synthetic X-intercept
0.0
0.0
Elbow Point
0.5673680280624417
0.5686757186808097
Synthetic Elbow Point
0.4987520428590393
0.5007818341046567
JS Distance
0.08324693291572466
0.08781917380810147
Synthetic JS Distance
0.16450586525420618
0.16928093074548106
% Genome Enriched
39.16064230568816
39.57311388088635
Diff. Enrichment
10.44093839234832
10.958012116329318
CHANCE Divergence
0.08891050892690862
0.0932611193955839
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
0.5111859709254128
0.49101830140167185
0.3774548609582149
0.4809072162426557
0.38116053733376304
0.4630631908422192
0.4911634222114865
0.5067788648925522
0.5058340406823514
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
0.34557429709545046
0.1847032320554034
0.274816690788002
0.3593897757039808
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
0.03904573146044728
0.02768506602426867
0.03267941110541106
0.041348140398805425
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