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
4938828
4356507
5683729
Distinct Fragments
4329278
3828517
4932720
Positions with Two Read
488775
427039
596820
NRF = Distinct/Total
0.87658
0.878804
0.867867
PBC1 = OneRead/Distinct
0.873898
0.875961
0.864209
PBC2 = OneRead/TwoRead
7.740467
7.853222
7.14269
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
71093
798
N1
44366
343
N2
36767
345
Np
75570
933
N optimal
75570
933
N conservative
71093
798
Optimal Set
pooled-pr1_vs_pooled-pr2
pooled-pr1_vs_pooled-pr2
Conservative Set
rep1_vs_rep2
rep1_vs_rep2
Rescue Ratio
1.0629738511527154
1.169172932330827
Self Consistency Ratio
1.2066799031740418
1.0058309037900874
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
114192
134410
Top 300000 raw peaks from spp with FDR 0.01
Peak calling statistics
Peak region size
rep1
rep2
idr_opt
overlap_opt
Min size
88.0
57.0
64.0
64.0
25 percentile
350.0
224.0
256.0
256.0
50 percentile (median)
350.0
224.0
256.0
256.0
75 percentile
350.0
224.0
256.0
256.0
Max size
382.0
224.0
256.0
256.0
Mean
349.96523399187333
223.99473997470426
253.0042872454448
255.96076485377796
Enrichment / Signal-to-noise ratio
Strand cross-correlation measures (trimmed/filtered SE BAM)
rep1
rep2
Number of Subsampled Reads
4657822
4104244
Estimated Fragment Length
70
135
Cross-correlation at Estimated Fragment Length
0.592514299445733
0.563320813478906
Phantom Peak
50
50
Cross-correlation at Phantom Peak
0.5930082
0.5639294
Argmin of Cross-correlation
1500
1500
Minimum of Cross-correlation
0.5884855
0.5590938
NSC (Normalized Strand Cross-correlation coeff.)
1.006846
1.00756
RSC (Relative Strand Cross-correlation coeff.)
0.8908032
0.8741411
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
0.4019547182357788
0.39810192655059257
Synthetic AUC
0.4978182467350038
0.4976768474077653
X-intercept
0.020202100826921233
0.02028191947894384
Synthetic X-intercept
0.0
0.0
Elbow Point
0.5331167587241786
0.5358665112863574
Synthetic Elbow Point
0.5013912968500286
0.5025529125783742
JS Distance
0.051426720963468744
0.05562722842276033
Synthetic JS Distance
0.1460225859958177
0.15063170387387398
% Genome Enriched
43.66619041537626
43.176902078477696
Diff. Enrichment
10.203628125234193
10.79278381750211
CHANCE Divergence
0.08678721486953189
0.09179497865338256
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
0.5397321450107058
0.5245302063764546
0.4702378819328631
0.447477226020553
0.47743846551427094
0.44048735719057674
0.5290879494347689
0.5340649666821592
0.5324865173665677
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
0.3063808041639202
0.2595507357604696
0.17415469331629319
0.32302723591546934
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
0.008597919624065621
0.004796989652101384
0.004310821410162108
0.009633367222703368
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