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
14055201
14381940
22406265
Distinct Fragments
11934993
12230541
19254251
Positions with Two Read
1601219
1643838
2478370
NRF = Distinct/Total
0.849151
0.85041
0.859324
PBC1 = OneRead/Distinct
0.846034
0.846302
0.854849
PBC2 = OneRead/TwoRead
6.306079
6.296689
6.641253
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
64220
1649
N1
46468
883
N2
54012
920
Np
64714
1804
N optimal
64714
1804
N conservative
64220
1649
Optimal Set
pooled-pr1_vs_pooled-pr2
pooled-pr1_vs_pooled-pr2
Conservative Set
rep1_vs_rep2
rep1_vs_rep2
Rescue Ratio
1.0076923076923077
1.0939963614311705
Self Consistency Ratio
1.1623482826891625
1.0419026047565119
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
115412
106793
Top 300000 raw peaks from spp with FDR 0.01
Peak calling statistics
Peak region size
rep1
rep2
idr_opt
overlap_opt
Min size
59.0
61.0
66.0
66.0
25 percentile
236.0
244.0
264.0
264.0
50 percentile (median)
236.0
244.0
264.0
264.0
75 percentile
236.0
244.0
264.0
264.0
Max size
485.0
246.0
1286.0
1286.0
Mean
235.80712577548263
243.75044244472952
237.82427937915742
263.26940074790616
Enrichment / Signal-to-noise ratio
Strand cross-correlation measures (trimmed/filtered SE BAM)
rep1
rep2
Number of Subsampled Reads
13176792
13518857
Estimated Fragment Length
130
130
Cross-correlation at Estimated Fragment Length
0.796349069206316
0.800386705274937
Phantom Peak
50
50
Cross-correlation at Phantom Peak
0.7962551
0.8001638
Argmin of Cross-correlation
1500
1500
Minimum of Cross-correlation
0.7903043
0.7937855
NSC (Normalized Strand Cross-correlation coeff.)
1.007649
1.008316
RSC (Relative Strand Cross-correlation coeff.)
1.015785
1.034951
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
0.4109879876805608
0.4065316642809877
Synthetic AUC
0.4986668367493617
0.4986818213777581
X-intercept
0.018874074192567945
0.018956057140114856
Synthetic X-intercept
0.0
0.0
Elbow Point
0.5103178538863916
0.5092940668340985
Synthetic Elbow Point
0.5010704934710861
0.5006359758505656
JS Distance
0.05412645976015304
0.061119568465228355
Synthetic JS Distance
0.14067289426956853
0.14564916305621423
% Genome Enriched
42.125237950506296
43.24440516372594
Diff. Enrichment
8.066028815019427
8.754849229838896
CHANCE Divergence
0.06854426525473556
0.07442980488152064
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
0.4479243725833781
0.4322369465493061
0.41004741032173714
0.43535188269228237
0.4124698676896675
0.45041897818687554
0.4035408609473564
0.4412171046711595
0.4389063250121499
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
0.28150778267073034
0.20436936959778784
0.24064560452729455
0.2834443030316104
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
0.013200699736725597
0.00809621589421359
0.008522963163490457
0.01417036719742704
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