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
3706002
9165056
16338020
Distinct Fragments
3337486
7275458
15457794
Positions with Two Read
281709
1224053
738963
NRF = Distinct/Total
0.900562
0.793826
0.946124
PBC1 = OneRead/Distinct
0.906656
0.795359
0.94977
PBC2 = OneRead/TwoRead
10.741407
4.727408
19.86751
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
10701
980
N1
6717
265
N2
8603
684
Np
10496
1080
N optimal
10701
1080
N conservative
10701
980
Optimal Set
rep1_vs_rep2
pooled-pr1_vs_pooled-pr2
Conservative Set
rep1_vs_rep2
rep1_vs_rep2
Rescue Ratio
1.01953125
1.1020408163265305
Self Consistency Ratio
1.28078011016823
2.581132075471698
Reproducibility Test
pass
borderline
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
15785
23572
Top 300000 raw peaks from spp with FDR 0.01
Peak calling statistics
Peak region size
rep1
rep2
idr_opt
overlap_opt
Min size
188.0
169.0
172.0
172.0
25 percentile
750.0
676.0
470.25
690.0
50 percentile (median)
750.0
676.0
690.0
690.0
75 percentile
750.0
676.0
690.0
690.0
Max size
3647.0
3507.0
3654.0
3654.0
Mean
750.0542286981312
673.5453504157475
628.5981481481482
680.8191757779647
Enrichment / Signal-to-noise ratio
Strand cross-correlation measures (trimmed/filtered SE BAM)
rep1
rep2
Number of Subsampled Reads
3706002
9165056
Estimated Fragment Length
175
220
Cross-correlation at Estimated Fragment Length
0.556283282565655
0.718173807299155
Phantom Peak
45
50
Cross-correlation at Phantom Peak
0.5566476
0.7177887
Argmin of Cross-correlation
1500
1500
Minimum of Cross-correlation
0.5505098
0.7110839
NSC (Normalized Strand Cross-correlation coeff.)
1.010487
1.009971
RSC (Relative Strand Cross-correlation coeff.)
0.940648
1.057433
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
0.36908728250049117
0.38286392521650303
Synthetic AUC
0.49504326297766255
0.49663691162772905
X-intercept
0.03276260879457309
0.029667164944647238
Synthetic X-intercept
0.0
0.0
Elbow Point
0.5460674291849862
0.5434809074380462
Synthetic Elbow Point
0.5020139696337311
0.5043144694236591
JS Distance
0.08430735807668965
0.06910634527006931
Synthetic JS Distance
0.18126300514849103
0.16963621618529642
% Genome Enriched
33.7271658627028
29.794096104450773
Diff. Enrichment
12.062615609794559
9.807202438079033
CHANCE Divergence
0.10318118636359642
0.08533990789471503
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
0.17380340316776677
0.21202131163208351
0.19952919801914604
0.17433484697513202
0.20573473579163432
0.1838235091893878
0.2522733064211934
0.18033309724103366
0.18472399694171926
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
0.10968107485642188
0.08767791605662754
0.09427928853966916
0.10797222959357008
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
0.022621748753149193
0.012676677575250426
0.01704353015675697
0.024122083452611104
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