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
8709407
9254949
13242799
Distinct Fragments
8284756
8731044
12651476
Positions with Two Read
355925
441330
513933
NRF = Distinct/Total
0.951242
0.943392
0.955348
PBC1 = OneRead/Distinct
0.9542
0.945947
0.95738
PBC2 = OneRead/TwoRead
22.21062
18.714125
23.567796
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
7159
1156
N1
7148
799
N2
6108
753
Np
7356
1127
N optimal
7356
1156
N conservative
7159
1156
Optimal Set
pooled-pr1_vs_pooled-pr2
rep1_vs_rep2
Conservative Set
rep1_vs_rep2
rep1_vs_rep2
Rescue Ratio
1.027517809749965
1.0257320319432122
Self Consistency Ratio
1.1702685003274393
1.0610889774236387
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
16264
12968
Top 300000 raw peaks from spp with FDR 0.01
Peak calling statistics
Peak region size
rep1
rep2
idr_opt
overlap_opt
Min size
142.0
156.0
150.0
150.0
25 percentile
570.0
624.0
322.0
600.0
50 percentile (median)
570.0
624.0
600.0
600.0
75 percentile
570.0
624.0
600.0
600.0
Max size
570.0
624.0
667.0
667.0
Mean
566.0474053123463
618.6431215299198
491.59083044982697
582.2653616095704
Enrichment / Signal-to-noise ratio
Strand cross-correlation measures (trimmed/filtered SE BAM)
rep1
rep2
Number of Subsampled Reads
8709407
9254949
Estimated Fragment Length
215
195
Cross-correlation at Estimated Fragment Length
0.767883236805104
0.775515514240137
Phantom Peak
50
50
Cross-correlation at Phantom Peak
0.7664754
0.774751
Argmin of Cross-correlation
1500
1500
Minimum of Cross-correlation
0.7605897
0.7692684
NSC (Normalized Strand Cross-correlation coeff.)
1.009589
1.008121
RSC (Relative Strand Cross-correlation coeff.)
1.239186
1.139455
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
0.3939971845011349
0.40047179789437115
Synthetic AUC
0.49685152039405317
0.49693274549748
X-intercept
0.02957737763752243
0.029469591270102655
Synthetic X-intercept
0.0
0.0
Elbow Point
0.4775954059054953
0.4677349493304271
Synthetic Elbow Point
0.4995380676106096
0.4994981016648183
JS Distance
0.038982974028308165
0.0354494229967638
Synthetic JS Distance
0.15363308033145068
0.14654010374025483
% Genome Enriched
31.4360936623612
31.796579180065113
Diff. Enrichment
7.030055221683629
6.555792555944584
CHANCE Divergence
0.06082661339863295
0.05678674929224738
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
0.13871773499975643
0.11633412803273334
0.15956406163855288
0.14077004746911853
0.16497892371295733
0.14506746629431677
0.125630758972833
0.12561384909555057
0.1344238951597003
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
0.06871322762233151
0.06918636705008675
0.06199582227814693
0.07061529524234732
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
0.01843270567548325
0.014087396047526918
0.013861275557763859
0.017902745424263535
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