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
720050
682837
7964349
Distinct Fragments
596618
632523
7587231
Positions with Two Read
86238
42646
328478
NRF = Distinct/Total
0.828579
0.926316
0.952649
PBC1 = OneRead/Distinct
0.826696
0.926803
0.954241
PBC2 = OneRead/TwoRead
5.719312
13.746283
22.041196
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
7604
1191
N1
3376
155
N2
3401
134
Np
7576
1266
N optimal
7604
1266
N conservative
7604
1191
Optimal Set
rep1_vs_rep2
pooled-pr1_vs_pooled-pr2
Conservative Set
rep1_vs_rep2
rep1_vs_rep2
Rescue Ratio
1.0036958817317845
1.0629722921914357
Self Consistency Ratio
1.007405213270142
1.1567164179104477
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
19127
19471
Top 300000 raw peaks from spp with FDR 0.01
Peak calling statistics
Peak region size
rep1
rep2
idr_opt
overlap_opt
Min size
81.0
80.0
82.0
82.0
25 percentile
316.0
320.0
330.0
330.0
50 percentile (median)
316.0
320.0
330.0
330.0
75 percentile
316.0
320.0
330.0
330.0
Max size
316.0
320.0
1026.0
1026.0
Mean
315.89940921210854
319.8090493554517
321.827804107425
328.6503156233561
Enrichment / Signal-to-noise ratio
Strand cross-correlation measures (trimmed/filtered SE BAM)
rep1
rep2
Number of Subsampled Reads
720050
682837
Estimated Fragment Length
115
135
Cross-correlation at Estimated Fragment Length
0.201143555679258
0.218716871745335
Phantom Peak
40
40
Cross-correlation at Phantom Peak
0.1891982
0.2085405
Argmin of Cross-correlation
1500
1500
Minimum of Cross-correlation
0.1730354
0.1934277
NSC (Normalized Strand Cross-correlation coeff.)
1.162442
1.130742
RSC (Relative Strand Cross-correlation coeff.)
1.739068
1.673357
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
0.2237450813170234
0.23597957320777765
Synthetic AUC
0.48557840329204977
0.4860115047500982
X-intercept
0.17409225944052176
0.14853845739470128
Synthetic X-intercept
2.4166928620684363e-40
6.2409036002645085e-43
Elbow Point
0.6126966962413486
0.6877879241925154
Synthetic Elbow Point
0.49483266410715054
0.49422144212274055
JS Distance
0.21740644405396103
0.2073615529982959
Synthetic JS Distance
0.3198752883755586
0.3119347119937266
% Genome Enriched
27.416069287354578
29.808845270611332
Diff. Enrichment
31.680805511979827
29.63344825829848
CHANCE Divergence
0.27142270281008585
0.25384023474079037
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
0.3012140346578502
0.28799303176064905
0.219866891824774
0.21685962260622965
0.22497011678459913
0.21416773662756636
0.3525832645682893
0.2930301254625579
0.29305193668896584
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
0.18068884914608263
0.11167695055950226
0.10694346408131275
0.17966218971446185
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
0.05857336882358796
0.016194854797613983
0.013015586605149204
0.06048781975745472
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