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
5204048
4392338
3707867
Distinct Fragments
4379415
3496223
3530894
Positions with Two Read
578249
588709
140079
NRF = Distinct/Total
0.84154
0.795982
0.952271
PBC1 = OneRead/Distinct
0.844979
0.794168
0.956359
PBC2 = OneRead/TwoRead
6.399515
4.716405
24.106411
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
8490
3210
N1
9035
2683
N2
8946
2677
Np
8162
3126
N optimal
8490
3210
N conservative
8490
3210
Optimal Set
rep1_vs_rep2
rep1_vs_rep2
Conservative Set
rep1_vs_rep2
rep1_vs_rep2
Rescue Ratio
1.0401862288654742
1.0268714011516316
Self Consistency Ratio
1.0099485803711157
1.0022413149047442
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
17019
17769
Top 300000 raw peaks from spp with FDR 0.01
Peak calling statistics
Peak region size
rep1
rep2
idr_opt
overlap_opt
Min size
96.0
98.0
98.0
98.0
25 percentile
384.0
390.0
390.0
390.0
50 percentile (median)
384.0
390.0
390.0
390.0
75 percentile
384.0
390.0
390.0
390.0
Max size
775.0
771.0
853.0
853.0
Mean
381.18373582466654
386.66655411109235
357.68193146417445
377.69811542991755
Enrichment / Signal-to-noise ratio
Strand cross-correlation measures (trimmed/filtered SE BAM)
rep1
rep2
Number of Subsampled Reads
5204048
4392338
Estimated Fragment Length
170
170
Cross-correlation at Estimated Fragment Length
0.631380441245434
0.569013668762533
Phantom Peak
40
40
Cross-correlation at Phantom Peak
0.6048025
0.5429983
Argmin of Cross-correlation
1500
1500
Minimum of Cross-correlation
0.5833793
0.523334
NSC (Normalized Strand Cross-correlation coeff.)
1.082281
1.087286
RSC (Relative Strand Cross-correlation coeff.)
2.240608
2.322975
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
0.32107921814380297
0.32713397243831466
Synthetic AUC
0.49465561149252685
0.4940199895745639
X-intercept
0.03895456231971945
0.039828287140286696
Synthetic X-intercept
1.2166521891328959e-300
8.579590043997034e-240
Elbow Point
0.580620065349829
0.6025190404187496
Synthetic Elbow Point
0.5081408048384635
0.4978302390317591
JS Distance
0.08908310668381136
0.09637291484279575
Synthetic JS Distance
0.25161237159767236
0.24228757123580205
% Genome Enriched
18.75635844261543
19.755756011346453
Diff. Enrichment
11.551178524476713
13.44473472931944
CHANCE Divergence
0.10421208085273392
0.12118625158597815
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
0.1891309323104109
0.19858634906589098
0.2277558590241692
0.24007925753965018
0.22886324490962656
0.2374287269378799
0.16986202367556502
0.18437563430938106
0.18281976169600275
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
0.13087028461790212
0.13400326608171403
0.13874238239948106
0.1297060060379292
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
0.07833976839358064
0.07036550572749645
0.07500656818806156
0.07731955170776697
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