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
5832693
5177911
6691695
Distinct Fragments
4844831
4392669
5582796
Positions with Two Read
731193
603114
834631
NRF = Distinct/Total
0.830634
0.848348
0.834287
PBC1 = OneRead/Distinct
0.824451
0.843301
0.827591
PBC2 = OneRead/TwoRead
5.462755
6.142026
5.535704
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
42747
955
N1
31253
570
N2
33233
414
Np
44380
1017
N optimal
44380
1017
N conservative
42747
955
Optimal Set
pooled-pr1_vs_pooled-pr2
pooled-pr1_vs_pooled-pr2
Conservative Set
rep1_vs_rep2
rep1_vs_rep2
Rescue Ratio
1.0382015112171614
1.0649214659685864
Self Consistency Ratio
1.0633539180238698
1.3768115942028984
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
81034
86576
Top 300000 raw peaks from spp with FDR 0.01
Peak calling statistics
Peak region size
rep1
rep2
idr_opt
overlap_opt
Min size
70.0
61.0
71.0
71.0
25 percentile
280.0
244.0
284.0
284.0
50 percentile (median)
280.0
244.0
284.0
284.0
75 percentile
280.0
244.0
284.0
284.0
Max size
280.0
244.0
284.0
284.0
Mean
279.94634351013156
243.97113518758084
276.795476892822
283.8312978819288
Enrichment / Signal-to-noise ratio
Strand cross-correlation measures (trimmed/filtered SE BAM)
rep1
rep2
Number of Subsampled Reads
5497310
4880598
Estimated Fragment Length
185
140
Cross-correlation at Estimated Fragment Length
0.611113159846889
0.590339327781456
Phantom Peak
50
50
Cross-correlation at Phantom Peak
0.6110863
0.5904645
Argmin of Cross-correlation
1500
1500
Minimum of Cross-correlation
0.6064922
0.5860346
NSC (Normalized Strand Cross-correlation coeff.)
1.007619
1.007345
RSC (Relative Strand Cross-correlation coeff.)
1.005856
0.971751
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
0.4013524917103809
0.400263567172178
Synthetic AUC
0.49795710252628855
0.4978482881869569
X-intercept
0.019549493449572485
0.019906753207354362
Synthetic X-intercept
0.0
0.0
Elbow Point
0.5350354066374472
0.5280379054598872
Synthetic Elbow Point
0.5000499842070442
0.503048241037697
JS Distance
0.05400416500767803
0.05227296806800567
Synthetic JS Distance
0.1454525023735886
0.1465055710023451
% Genome Enriched
42.1073535634166
43.8940515252397
Diff. Enrichment
10.263203071179989
10.372537568091989
CHANCE Divergence
0.08724527690652016
0.08825937147040916
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
0.39736238049130845
0.3939126290419172
0.40601421582263214
0.4216713617404543
0.39706693248241615
0.42141479897588324
0.5261040832948989
0.4054761735503898
0.40114598798649237
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
0.21854064607272256
0.17501514627635806
0.16949793793308782
0.22548549592437403
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
0.010828214072526087
0.007696712071597666
0.005363864527354792
0.011359868973348106
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