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
7306810
8950230
21357837
Distinct Fragments
5727097
7163829
19866619
Positions with Two Read
943031
1054462
1247016
NRF = Distinct/Total
0.783803
0.800407
0.930179
PBC1 = OneRead/Distinct
0.795913
0.82026
0.933221
PBC2 = OneRead/TwoRead
4.833639
5.572703
14.867451
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
19509
3058
N1
10832
1620
N2
11838
1761
Np
19291
3051
N optimal
19509
3058
N conservative
19509
3058
Optimal Set
rep1_vs_rep2
rep1_vs_rep2
Conservative Set
rep1_vs_rep2
rep1_vs_rep2
Rescue Ratio
1.0113006065004406
1.002294329727958
Self Consistency Ratio
1.0928729689807977
1.087037037037037
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
25186
29837
Top 300000 raw peaks from spp with FDR 0.01
Peak calling statistics
Peak region size
rep1
rep2
idr_opt
overlap_opt
Min size
179.0
172.0
176.0
176.0
25 percentile
716.0
690.0
370.0
704.0
50 percentile (median)
716.0
690.0
704.0
704.0
75 percentile
716.0
690.0
704.0
704.0
Max size
13299.0
3844.0
13346.0
13346.0
Mean
718.4496148654014
684.1107685088983
699.8387835186396
700.1326567225383
Enrichment / Signal-to-noise ratio
Strand cross-correlation measures (trimmed/filtered SE BAM)
rep1
rep2
Number of Subsampled Reads
7306810
8950230
Estimated Fragment Length
215
200
Cross-correlation at Estimated Fragment Length
0.665129774047945
0.71508403819699
Phantom Peak
50
50
Cross-correlation at Phantom Peak
0.6583229
0.7093934
Argmin of Cross-correlation
1500
1500
Minimum of Cross-correlation
0.6439149
0.696836
NSC (Normalized Strand Cross-correlation coeff.)
1.032947
1.026187
RSC (Relative Strand Cross-correlation coeff.)
1.472438
1.453174
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
0.3628908112772924
0.37027534019443453
Synthetic AUC
0.49620990844130947
0.49661123087424697
X-intercept
0.030475000399227098
0.030063796489995367
Synthetic X-intercept
0.0
0.0
Elbow Point
0.5953214576579742
0.5858897175069067
Synthetic Elbow Point
0.5006166383137092
0.5006558099995656
JS Distance
0.11481894495662295
0.10239451342060382
Synthetic JS Distance
0.20203773002226802
0.19198415996588322
% Genome Enriched
26.488119001612876
26.812890244486674
Diff. Enrichment
13.17348852967698
12.027550443957624
CHANCE Divergence
0.11606337497229667
0.10602562669431675
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
0.261004919703725
0.275399558159907
0.2331764246679554
0.22774459440481146
0.23038524622787154
0.22698494420947887
0.37028458816759957
0.2665157389675813
0.26424042532396513
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
0.19188063564638108
0.14467311978831815
0.14215189387461652
0.190848043046204
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
0.06468728780152255
0.04872309921609078
0.04543163170220117
0.06467557494976273
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