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
8329167
7984172
16789247
Distinct Fragments
6598957
6288015
15875843
Positions with Two Read
795308
749299
782730
NRF = Distinct/Total
0.792271
0.78756
0.945596
PBC1 = OneRead/Distinct
0.846554
0.847837
0.948137
PBC2 = OneRead/TwoRead
7.02416
7.11493
19.230744
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
23920
5190
N1
20322
3932
N2
22369
3941
Np
24077
5317
N optimal
24077
5317
N conservative
23920
5190
Optimal Set
pooled-pr1_vs_pooled-pr2
pooled-pr1_vs_pooled-pr2
Conservative Set
rep1_vs_rep2
rep1_vs_rep2
Rescue Ratio
1.0065635451505017
1.0244701348747591
Self Consistency Ratio
1.1007282747761047
1.002288911495422
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
34090
33264
Top 300000 raw peaks from spp with FDR 0.01
Peak calling statistics
Peak region size
rep1
rep2
idr_opt
overlap_opt
Min size
162.0
171.0
168.0
168.0
25 percentile
650.0
684.0
386.0
670.0
50 percentile (median)
650.0
684.0
599.0
670.0
75 percentile
650.0
684.0
670.0
670.0
Max size
3014.0
3565.0
5255.0
5255.0
Mean
637.9819888530361
671.9189514189515
636.1104006018431
649.3212194210242
Enrichment / Signal-to-noise ratio
Strand cross-correlation measures (trimmed/filtered SE BAM)
rep1
rep2
Number of Subsampled Reads
8329167
7984172
Estimated Fragment Length
230
230
Cross-correlation at Estimated Fragment Length
0.712752698532746
0.702294872624049
Phantom Peak
50
50
Cross-correlation at Phantom Peak
0.6921402
0.6824053
Argmin of Cross-correlation
1500
1500
Minimum of Cross-correlation
0.6641756
0.6544358
NSC (Normalized Strand Cross-correlation coeff.)
1.073139
1.07313
RSC (Relative Strand Cross-correlation coeff.)
1.73709
1.711114
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
0.3121501937164446
0.3071112319240877
Synthetic AUC
0.4964698084237942
0.49638374232996335
X-intercept
0.030726641664887002
0.030996086070522583
Synthetic X-intercept
0.0
0.0
Elbow Point
0.7205142995144013
0.7255219736902507
Synthetic Elbow Point
0.5025251995972743
0.5059779345701056
JS Distance
0.19918417964623653
0.2072446690635627
Synthetic JS Distance
0.2803030402907853
0.28745733809442736
% Genome Enriched
19.631719394608318
20.034289295472735
Diff. Enrichment
22.438569929263473
23.447456647021603
CHANCE Divergence
0.2029330972475697
0.21084004275951204
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
0.3612737699649675
0.3664807419439244
0.3599195984650616
0.39173143669768695
0.36020365243447144
0.38632537653094606
0.3411550331555784
0.365698022247543
0.36450154725268585
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
0.2956244597319083
0.2749199870967214
0.2970608442470319
0.2969749796576433
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
0.14061992968359635
0.11754832252075154
0.12256279807805723
0.14184446624673763
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