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
5467723
6315973
7506576
Distinct Fragments
4509412
5139353
6053841
Positions with Two Read
701484
845517
1026961
NRF = Distinct/Total
0.824733
0.813707
0.806472
PBC1 = OneRead/Distinct
0.818062
0.805764
0.79798
PBC2 = OneRead/TwoRead
5.258818
4.897718
4.704021
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
31885
1069
N1
28634
347
N2
27684
676
Np
32947
1136
N optimal
32947
1136
N conservative
31885
1069
Optimal Set
pooled-pr1_vs_pooled-pr2
pooled-pr1_vs_pooled-pr2
Conservative Set
rep1_vs_rep2
rep1_vs_rep2
Rescue Ratio
1.0333071977418848
1.0626753975678205
Self Consistency Ratio
1.0343158503106487
1.9481268011527377
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
73868
65270
Top 300000 raw peaks from spp with FDR 0.01
Peak calling statistics
Peak region size
rep1
rep2
idr_opt
overlap_opt
Min size
71.0
75.0
72.0
72.0
25 percentile
260.0
264.0
284.0
284.0
50 percentile (median)
260.0
264.0
284.0
284.0
75 percentile
260.0
264.0
284.0
284.0
Max size
260.0
264.0
284.0
284.0
Mean
259.9935425353333
263.98008273326184
279.93221830985914
283.85974443803684
Enrichment / Signal-to-noise ratio
Strand cross-correlation measures (trimmed/filtered SE BAM)
rep1
rep2
Number of Subsampled Reads
5159065
5967825
Estimated Fragment Length
165
165
Cross-correlation at Estimated Fragment Length
0.592876464237337
0.623287490204593
Phantom Peak
50
50
Cross-correlation at Phantom Peak
0.593231
0.6232462
Argmin of Cross-correlation
1500
1500
Minimum of Cross-correlation
0.5894372
0.6190163
NSC (Normalized Strand Cross-correlation coeff.)
1.005835
1.0069
RSC (Relative Strand Cross-correlation coeff.)
0.906539
1.00977
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
0.40460357516307766
0.4042264976403156
Synthetic AUC
0.49788660015759606
0.49802064350176634
X-intercept
0.019686155221831016
0.01958236529264768
Synthetic X-intercept
0.0
0.0
Elbow Point
0.5285781578085954
0.5370011097538582
Synthetic Elbow Point
0.49885390936620533
0.5019191416562515
JS Distance
0.043134133041918946
0.045348974376874636
Synthetic JS Distance
0.14520281853042388
0.1472821241902706
% Genome Enriched
43.91072469322092
41.97464332191644
Diff. Enrichment
9.615767938312326
9.51537839536975
CHANCE Divergence
0.08179019908936622
0.08087742011051276
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
0.3515651349477776
0.3180416912323212
0.3946927473728941
0.3753674969808102
0.39955361262646105
0.3761110198832952
0.5373060434621992
0.33457594722785666
0.3428937090335617
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
0.16614176931033273
0.15174080271049095
0.14979010218220107
0.17110984732355738
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
0.010991631964986126
0.004256565019593712
0.008019019839540582
0.01161542029811651
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