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
8437663
6956454
7235412
Distinct Fragments
7267145
6085025
6395531
Positions with Two Read
916467
701428
692779
NRF = Distinct/Total
0.861275
0.874731
0.883921
PBC1 = OneRead/Distinct
0.857443
0.871508
0.880726
PBC2 = OneRead/TwoRead
6.799113
7.560507
8.130604
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
80247
597
N1
43405
199
N2
36507
232
Np
88690
699
N optimal
88690
699
N conservative
80247
597
Optimal Set
pooled-pr1_vs_pooled-pr2
pooled-pr1_vs_pooled-pr2
Conservative Set
rep1_vs_rep2
rep1_vs_rep2
Rescue Ratio
1.105212655924832
1.170854271356784
Self Consistency Ratio
1.1889500643712165
1.1658291457286432
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
143103
118784
Top 300000 raw peaks from spp with FDR 0.01
Peak calling statistics
Peak region size
rep1
rep2
idr_opt
overlap_opt
Min size
63.0
66.0
69.0
69.0
25 percentile
250.0
264.0
276.0
276.0
50 percentile (median)
250.0
264.0
276.0
276.0
75 percentile
250.0
264.0
276.0
276.0
Max size
250.0
264.0
276.0
276.0
Mean
249.98864454274195
263.9725804822198
269.19885550786836
275.94632991318076
Enrichment / Signal-to-noise ratio
Strand cross-correlation measures (trimmed/filtered SE BAM)
rep1
rep2
Number of Subsampled Reads
7928536
6538069
Estimated Fragment Length
160
160
Cross-correlation at Estimated Fragment Length
0.706297163345223
0.670710868456568
Phantom Peak
50
50
Cross-correlation at Phantom Peak
0.7065539
0.6708235
Argmin of Cross-correlation
1500
1500
Minimum of Cross-correlation
0.7021734
0.6668345
NSC (Normalized Strand Cross-correlation coeff.)
1.005873
1.005813
RSC (Relative Strand Cross-correlation coeff.)
0.9414009
0.9717527
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
0.4173491320879717
0.4138845887890624
Synthetic AUC
0.4983297759181482
0.49817939198740835
X-intercept
0.019182221122395423
0.019385777776003865
Synthetic X-intercept
0.0
0.0
Elbow Point
0.49659840866592564
0.5067562848116801
Synthetic Elbow Point
0.5004741281214842
0.5025682567131197
JS Distance
0.03424428366146226
0.03335671580395928
Synthetic JS Distance
0.12744401997613716
0.13326536515480303
% Genome Enriched
45.3262793635462
45.15066185847225
Diff. Enrichment
8.067624398229679
8.507629163144708
CHANCE Divergence
0.0686321930497817
0.07238494027641552
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
0.5565981302325849
0.5022634200530586
0.4170244484442683
0.4060144564041114
0.4291171932282034
0.41159313982895235
0.5539698490144589
0.558947894329099
0.5573844188081722
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
0.3466248582006817
0.19747402337051956
0.17894618997888487
0.37715033007838694
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
0.005245821564922905
0.002146417373464175
0.0027857540297829843
0.005911624646557132
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