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
5625831
4448106
6161955
Distinct Fragments
4882192
3899299
5358913
Positions with Two Read
585923
438716
637835
NRF = Distinct/Total
0.867817
0.87662
0.869677
PBC1 = OneRead/Distinct
0.864807
0.874174
0.866444
PBC2 = OneRead/TwoRead
7.205988
7.769641
7.279619
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
37418
2522
N1
30048
1249
N2
27965
1490
Np
36791
2632
N optimal
37418
2632
N conservative
37418
2522
Optimal Set
rep1_vs_rep2
pooled-pr1_vs_pooled-pr2
Conservative Set
rep1_vs_rep2
rep1_vs_rep2
Rescue Ratio
1.0170422114103992
1.0436161776367963
Self Consistency Ratio
1.0744859645986053
1.1929543634907926
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
74988
67249
Top 300000 raw peaks from spp with FDR 0.01
Peak calling statistics
Peak region size
rep1
rep2
idr_opt
overlap_opt
Min size
71.0
70.0
79.0
79.0
25 percentile
284.0
280.0
316.0
316.0
50 percentile (median)
284.0
280.0
316.0
316.0
75 percentile
284.0
280.0
316.0
316.0
Max size
284.0
280.0
426.0
426.0
Mean
283.8082626553582
279.73461315409895
302.69870820668694
315.0750708215297
Enrichment / Signal-to-noise ratio
Strand cross-correlation measures (trimmed/filtered SE BAM)
rep1
rep2
Number of Subsampled Reads
5315430
4201190
Estimated Fragment Length
180
155
Cross-correlation at Estimated Fragment Length
0.622502523887045
0.570916908676248
Phantom Peak
50
50
Cross-correlation at Phantom Peak
0.6216566
0.5696179
Argmin of Cross-correlation
1500
1500
Minimum of Cross-correlation
0.6162312
0.5632075
NSC (Normalized Strand Cross-correlation coeff.)
1.010177
1.013688
RSC (Relative Strand Cross-correlation coeff.)
1.155913
1.202633
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
0.39656475569550836
0.3861538644776081
Synthetic AUC
0.49796941253978527
0.4977259348883882
X-intercept
0.019778307328152254
0.02008166784418446
Synthetic X-intercept
0.0
0.0
Elbow Point
0.5587920663241887
0.5728544228765762
Synthetic Elbow Point
0.4986570144281351
0.49915916348256845
JS Distance
0.06665296890087626
0.08026179881307834
Synthetic JS Distance
0.1560080063547651
0.17021818576024403
% Genome Enriched
40.95207303005265
40.150163455435944
Diff. Enrichment
10.692065842255127
12.196832393183993
CHANCE Divergence
0.09090389254768091
0.10373000221385215
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
0.38074153716693127
0.3631537161942735
0.3839763485896112
0.3964451510593025
0.3949495245574417
0.39491456091482785
0.5007646434567745
0.36441472233328603
0.37375579238621537
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
0.22266392570903612
0.17905893455048125
0.17936523340243546
0.2197064407224543
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
0.031045361566554585
0.01762976147269305
0.022667815906632402
0.0320709579171739
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