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
9622681
9980686
10202850
Distinct Fragments
8397370
8706903
8890297
Positions with Two Read
976761
1015401
1060485
NRF = Distinct/Total
0.872664
0.872375
0.871354
PBC1 = OneRead/Distinct
0.869765
0.869441
0.867272
PBC2 = OneRead/TwoRead
7.477509
7.45532
7.270543
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
72274
1537
N1
56224
629
N2
49683
545
Np
72796
1556
N optimal
72796
1556
N conservative
72274
1537
Optimal Set
pooled-pr1_vs_pooled-pr2
pooled-pr1_vs_pooled-pr2
Conservative Set
rep1_vs_rep2
rep1_vs_rep2
Rescue Ratio
1.0072225143205025
1.0123617436564736
Self Consistency Ratio
1.131654690739287
1.1541284403669725
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
113396
122947
Top 300000 raw peaks from spp with FDR 0.01
Peak calling statistics
Peak region size
rep1
rep2
idr_opt
overlap_opt
Min size
68.0
60.0
70.0
70.0
25 percentile
270.0
240.0
280.0
280.0
50 percentile (median)
270.0
240.0
280.0
280.0
75 percentile
270.0
240.0
280.0
280.0
Max size
270.0
240.0
280.0
280.0
Mean
269.95394899290983
239.9695315867813
272.16452442159385
279.8300730809385
Enrichment / Signal-to-noise ratio
Strand cross-correlation measures (trimmed/filtered SE BAM)
rep1
rep2
Number of Subsampled Reads
9073631
9416758
Estimated Fragment Length
130
150
Cross-correlation at Estimated Fragment Length
0.73862001475893
0.745295614815638
Phantom Peak
50
50
Cross-correlation at Phantom Peak
0.7385379
0.7453707
Argmin of Cross-correlation
1500
1500
Minimum of Cross-correlation
0.7335668
0.7404922
NSC (Normalized Strand Cross-correlation coeff.)
1.006889
1.006487
RSC (Relative Strand Cross-correlation coeff.)
1.016517
0.9846086
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
0.4084304373690628
0.4099268692692436
Synthetic AUC
0.49844098651307644
0.4984518668068159
X-intercept
0.018699445106695658
0.018976991595732573
Synthetic X-intercept
0.0
0.0
Elbow Point
0.5236343814207585
0.5207351188158549
Synthetic Elbow Point
0.5009631947140568
0.5015941072490887
JS Distance
0.043691234566637455
0.03964810000504546
Synthetic JS Distance
0.1455726993637976
0.14629872579262848
% Genome Enriched
43.61473352541947
43.01830808458978
Diff. Enrichment
9.731995696307926
9.287670103150624
CHANCE Divergence
0.08273536953674791
0.07894005948277372
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
0.47574804540180465
0.47678855582309393
0.4843718205874676
0.4388006861580871
0.4698356791183907
0.42741970837820387
0.4511651432819971
0.4727457319181729
0.47562993166301776
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
0.3184847604361891
0.26488162535046483
0.22100701797065225
0.3204988432819913
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
0.012337342043479037
0.006500885490337179
0.011099644098609342
0.012410314802109043
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