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
5730641
4542843
7489644
Distinct Fragments
1270879
1633387
3533091
Positions with Two Read
177253
296033
822664
NRF = Distinct/Total
0.221769
0.359552
0.47173
PBC1 = OneRead/Distinct
0.299969
0.418845
0.478281
PBC2 = OneRead/TwoRead
2.150734
2.311013
2.054069
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
22611
1293
N1
8800
355
N2
10584
870
Np
22270
1498
N optimal
22611
1498
N conservative
22611
1293
Optimal Set
rep1_vs_rep2
pooled-pr1_vs_pooled-pr2
Conservative Set
rep1_vs_rep2
rep1_vs_rep2
Rescue Ratio
1.0153120790300854
1.1585460170146946
Self Consistency Ratio
1.2027272727272726
2.4507042253521125
Reproducibility Test
pass
borderline
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
43061
49544
Top 300000 raw peaks from spp with FDR 0.01
Peak calling statistics
Peak region size
rep1
rep2
idr_opt
overlap_opt
Min size
139.0
108.0
118.0
118.0
25 percentile
544.0
430.0
470.0
470.0
50 percentile (median)
544.0
430.0
470.0
470.0
75 percentile
544.0
430.0
470.0
470.0
Max size
1131.0
542.0
1469.0
1469.0
Mean
543.7691414505005
429.67138301307926
452.4499332443258
468.8341072929105
Enrichment / Signal-to-noise ratio
Strand cross-correlation measures (trimmed/filtered SE BAM)
rep1
rep2
Number of Subsampled Reads
5730641
4542843
Estimated Fragment Length
170
175
Cross-correlation at Estimated Fragment Length
0.230394073184967
0.292889829137438
Phantom Peak
55
50
Cross-correlation at Phantom Peak
0.2273977
0.2860057
Argmin of Cross-correlation
1500
1500
Minimum of Cross-correlation
0.2198719
0.2770982
NSC (Normalized Strand Cross-correlation coeff.)
1.047856
1.056989
RSC (Relative Strand Cross-correlation coeff.)
1.398151
1.772855
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
0.31151932079155353
0.3121183372223561
Synthetic AUC
0.4918509720897022
0.4928637814164333
X-intercept
0.04960721965776843
0.04409951765217495
Synthetic X-intercept
1.817093929884209e-128
6.169813717649091e-168
Elbow Point
0.6040439020303293
0.597903841627136
Synthetic Elbow Point
0.4960020266898474
0.4935601497961941
JS Distance
0.055687264392747265
0.06105676623403746
Synthetic JS Distance
0.24916503030949558
0.2546250259716084
% Genome Enriched
35.722464482204195
32.46452210062677
Diff. Enrichment
18.701491996623155
18.39643108866589
CHANCE Divergence
0.1594655125400659
0.15674414284992086
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
0.35231702993079905
0.36313602732632794
0.2709697130498404
0.2873799869745163
0.2719976715914865
0.29853444770836757
0.40795734652628196
0.35521652360335076
0.35898738493725313
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
0.20241812493121394
0.1175571991262043
0.13605266052302137
0.20270951579852103
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
0.04209759497717613
0.02024330884593522
0.03363454249533171
0.045925157268961805
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