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
3634390
4778247
12911816
Distinct Fragments
3208790
4360452
12365661
Positions with Two Read
326371
323898
470666
NRF = Distinct/Total
0.882896
0.912563
0.957701
PBC1 = OneRead/Distinct
0.885705
0.918309
0.960159
PBC2 = OneRead/TwoRead
8.708007
12.36267
25.225954
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
12015
2693
N1
9599
1636
N2
8978
1454
Np
11845
2440
N optimal
12015
2693
N conservative
12015
2693
Optimal Set
rep1_vs_rep2
rep1_vs_rep2
Conservative Set
rep1_vs_rep2
rep1_vs_rep2
Rescue Ratio
1.0143520472773322
1.103688524590164
Self Consistency Ratio
1.069169079973268
1.125171939477304
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
21747
21147
Top 300000 raw peaks from spp with FDR 0.01
Peak calling statistics
Peak region size
rep1
rep2
idr_opt
overlap_opt
Min size
136.0
136.0
136.0
136.0
25 percentile
544.0
544.0
340.0
544.0
50 percentile (median)
544.0
544.0
544.0
544.0
75 percentile
544.0
544.0
544.0
544.0
Max size
6710.0
6057.0
6713.0
6713.0
Mean
544.4472800846094
542.4339149761196
504.67545488303006
533.5317519766958
Enrichment / Signal-to-noise ratio
Strand cross-correlation measures (trimmed/filtered SE BAM)
rep1
rep2
Number of Subsampled Reads
3634390
4778247
Estimated Fragment Length
230
205
Cross-correlation at Estimated Fragment Length
0.551432587072825
0.629926742374349
Phantom Peak
50
50
Cross-correlation at Phantom Peak
0.5451747
0.6249759
Argmin of Cross-correlation
1500
1500
Minimum of Cross-correlation
0.5316084
0.6135045
NSC (Normalized Strand Cross-correlation coeff.)
1.037291
1.026768
RSC (Relative Strand Cross-correlation coeff.)
1.461278
1.431585
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
0.33966730231728015
0.35656602840932294
Synthetic AUC
0.49494948752334855
0.49566582563307476
X-intercept
0.033820185918203176
0.03197577514157449
Synthetic X-intercept
0.0
0.0
Elbow Point
0.6193387667598853
0.5955410770640334
Synthetic Elbow Point
0.49987848634800636
0.5060872134730876
JS Distance
0.14247897590864358
0.11445007473690362
Synthetic JS Distance
0.22957776126086463
0.20656312369139138
% Genome Enriched
27.841819818632942
28.006898575372325
Diff. Enrichment
16.73860409414051
13.948396695261367
CHANCE Divergence
0.14532502036160477
0.12154280884577977
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
0.24300529230395435
0.21725142065404782
0.2533233005719046
0.21760649165044074
0.2521011788915197
0.21890329570347256
0.2622188995042307
0.22781056375102623
0.22650348061521372
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
0.15180958546872456
0.1475944453276831
0.12402527363134087
0.15036774441414788
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
0.06433048795656438
0.05352457154403441
0.04090168226723666
0.06028094731823612
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