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
2252918
2771935
8437164
Distinct Fragments
1065847
1052615
7775798
Positions with Two Read
316425
283527
513301
NRF = Distinct/Total
0.473096
0.37974
0.921613
PBC1 = OneRead/Distinct
0.403204
0.280541
0.927242
PBC2 = OneRead/TwoRead
1.358154
1.04153
14.046429
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
11769
1713
N1
5117
712
N2
5507
1095
Np
11075
1913
N optimal
11769
1913
N conservative
11769
1713
Optimal Set
rep1_vs_rep2
pooled-pr1_vs_pooled-pr2
Conservative Set
rep1_vs_rep2
rep1_vs_rep2
Rescue Ratio
1.0626636568848757
1.1167542323409223
Self Consistency Ratio
1.0762165331248779
1.5379213483146068
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
33990
32130
Top 300000 raw peaks from spp with FDR 0.01
Peak calling statistics
Peak region size
rep1
rep2
idr_opt
overlap_opt
Min size
91.0
80.0
94.0
94.0
25 percentile
364.0
320.0
376.0
376.0
50 percentile (median)
364.0
320.0
376.0
376.0
75 percentile
364.0
320.0
376.0
376.0
Max size
13350.0
13357.0
13384.0
13384.0
Mean
373.2032362459547
329.84765017117957
508.8112911657083
397.5659784178775
Enrichment / Signal-to-noise ratio
Strand cross-correlation measures (trimmed/filtered SE BAM)
rep1
rep2
Number of Subsampled Reads
2252918
2771935
Estimated Fragment Length
145
135
Cross-correlation at Estimated Fragment Length
0.27638503763264
0.288366339850547
Phantom Peak
40
40
Cross-correlation at Phantom Peak
0.2553049
0.2596751
Argmin of Cross-correlation
1500
1500
Minimum of Cross-correlation
0.2413538
0.2381218
NSC (Normalized Strand Cross-correlation coeff.)
1.145145
1.211003
RSC (Relative Strand Cross-correlation coeff.)
2.510992
2.331174
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
0.2693211339819394
0.24639853301377207
Synthetic AUC
0.48922930870149955
0.48916261692660823
X-intercept
0.0827120023782494
0.09822648835116687
Synthetic X-intercept
4.8808064280207675e-73
3.928261911902115e-72
Elbow Point
0.6337456031316278
0.6654529348036448
Synthetic Elbow Point
0.5003680941800633
0.5033636450376655
JS Distance
0.19284226353973596
0.22930946910143005
Synthetic JS Distance
0.29741600751373065
0.32883004565300455
% Genome Enriched
33.974649297997445
31.20075657061226
Diff. Enrichment
26.410662091108488
30.2810018635222
CHANCE Divergence
0.22603726704386373
0.2593604261422245
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
0.3486572552837613
0.36272500769855265
0.2689158839213604
0.2825452814870804
0.26090772640608345
0.28226906674878455
0.38392198765092006
0.33799136844389904
0.3364127193482832
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
0.1942466495445384
0.12041831236792902
0.1478140776200741
0.18735884215085838
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
0.0792195240493555
0.05000350345366775
0.07137724774409078
0.08411083192581277
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