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
5335665
1821346
9684184
Distinct Fragments
4699904
1685729
7686133
Positions with Two Read
480423
112942
1153210
NRF = Distinct/Total
0.880847
0.92554
0.793679
PBC1 = OneRead/Distinct
0.883233
0.926807
0.805492
PBC2 = OneRead/TwoRead
8.640536
13.833171
5.368597
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
13392
4312
N1
11424
3382
N2
9803
2965
Np
13260
4531
N optimal
13392
4531
N conservative
13392
4312
Optimal Set
rep1_vs_rep2
pooled-pr1_vs_pooled-pr2
Conservative Set
rep1_vs_rep2
rep1_vs_rep2
Rescue Ratio
1.0099547511312217
1.0507884972170687
Self Consistency Ratio
1.1653575436090993
1.1406408094435077
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
26193
24891
Top 300000 raw peaks from spp with FDR 0.01
Peak calling statistics
Peak region size
rep1
rep2
idr_opt
overlap_opt
Min size
101.0
91.0
99.0
99.0
25 percentile
404.0
364.0
240.0
396.0
50 percentile (median)
404.0
364.0
396.0
396.0
75 percentile
404.0
364.0
396.0
396.0
Max size
833.0
464.0
1383.0
1383.0
Mean
396.88928339632724
359.6731348680246
331.78238799382035
373.86596475507764
Enrichment / Signal-to-noise ratio
Strand cross-correlation measures (trimmed/filtered SE BAM)
rep1
rep2
Number of Subsampled Reads
5335665
1821346
Estimated Fragment Length
155
145
Cross-correlation at Estimated Fragment Length
0.659687990056164
0.440999283275063
Phantom Peak
40
40
Cross-correlation at Phantom Peak
0.6376147
0.4136559
Argmin of Cross-correlation
1500
1500
Minimum of Cross-correlation
0.6024655
0.3732683
NSC (Normalized Strand Cross-correlation coeff.)
1.09498
1.181454
RSC (Relative Strand Cross-correlation coeff.)
1.627989
1.677023
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
0.3182202007807541
0.27015127126911526
Synthetic AUC
0.4948466766218185
0.4914029719141196
X-intercept
0.03844718774255209
0.054493286856445076
Synthetic X-intercept
0.0
2.719448558194845e-115
Elbow Point
0.6724636408802409
0.6999128059523406
Synthetic Elbow Point
0.49812879360388435
0.5065617417001661
JS Distance
0.13194446000485613
0.19760042060410307
Synthetic JS Distance
0.26285292230806867
0.3195387570579863
% Genome Enriched
24.33931054848448
23.241304039857855
Diff. Enrichment
16.279998449320843
23.957787533878832
CHANCE Divergence
0.14143138794319368
0.2069089433592222
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
0.25797677825287835
0.31191720770997017
0.25959852707048564
0.3306720011121282
0.25644788250482814
0.33085931931627677
0.3980796835306486
0.26912085472664987
0.26647384101954613
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
0.1928279335085122
0.17000930650628665
0.20931042160733157
0.19191239101723895
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
0.10960865975678652
0.08897655989976956
0.11563541515722359
0.11209838036433384
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