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
3955294
4301519
9568343
Distinct Fragments
3578217
3864242
9110325
Positions with Two Read
274516
283808
331415
NRF = Distinct/Total
0.904665
0.898344
0.952132
PBC1 = OneRead/Distinct
0.913247
0.914362
0.960655
PBC2 = OneRead/TwoRead
11.903849
12.449674
26.407613
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
14491
3069
N1
10484
1669
N2
13145
2602
Np
14418
3168
N optimal
14491
3168
N conservative
14491
3069
Optimal Set
rep1_vs_rep2
pooled-pr1_vs_pooled-pr2
Conservative Set
rep1_vs_rep2
rep1_vs_rep2
Rescue Ratio
1.005063115550007
1.032258064516129
Self Consistency Ratio
1.2538153376573826
1.5590173756740564
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
25140
31406
Top 300000 raw peaks from spp with FDR 0.01
Peak calling statistics
Peak region size
rep1
rep2
idr_opt
overlap_opt
Min size
115.0
111.0
112.0
112.0
25 percentile
460.0
444.0
450.0
450.0
50 percentile (median)
460.0
444.0
450.0
450.0
75 percentile
460.0
444.0
450.0
450.0
Max size
3817.0
1485.0
10610.0
10610.0
Mean
459.1167462211615
441.0852384894606
459.23737373737373
451.5254985853288
Enrichment / Signal-to-noise ratio
Strand cross-correlation measures (trimmed/filtered SE BAM)
rep1
rep2
Number of Subsampled Reads
3955294
4301519
Estimated Fragment Length
165
150
Cross-correlation at Estimated Fragment Length
0.598591998823241
0.623899314052131
Phantom Peak
30
40
Cross-correlation at Phantom Peak
0.5856788
0.6016614
Argmin of Cross-correlation
1500
1500
Minimum of Cross-correlation
0.5623854
0.5697221
NSC (Normalized Strand Cross-correlation coeff.)
1.06438
1.095094
RSC (Relative Strand Cross-correlation coeff.)
1.554374
1.696254
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
0.3118708439215731
0.2925118068370104
Synthetic AUC
0.4941019593075826
0.49432310104856214
X-intercept
0.04119714164273727
0.041187164132046365
Synthetic X-intercept
1.4959552406552563e-246
2.972664461717733e-266
Elbow Point
0.6531398228393201
0.6858520893905138
Synthetic Elbow Point
0.5047016908707258
0.4974429913759608
JS Distance
0.13058237334646894
0.16335205244049775
Synthetic JS Distance
0.2670123526948477
0.29666068080595065
% Genome Enriched
25.788672332562406
22.73715046285672
Diff. Enrichment
14.810297134717587
18.09980930331007
CHANCE Divergence
0.1271791672377347
0.15642950518442178
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
0.26794340024729235
0.32492692417159946
0.2810419575607298
0.3168203043409178
0.27840698456531826
0.316399842445671
0.31740551707295267
0.29121749790412377
0.29147140292560647
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
0.2036646143847458
0.16275703195931443
0.2030239213586075
0.20362844867104346
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
0.0904739376655232
0.06039654456700534
0.08456767571172605
0.09236256194713
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