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
rep3
ctl1
ctl2
ctl3
ctl4
Total Fragments
1266541
1031289
999325
1449951
2021943
2908895
1705713
Distinct Fragments
1242096
1011389
981031
1446811
2014504
2895991
1700692
Positions with Two Read
22366
18537
17193
3114
7276
12643
4962
NRF = Distinct/Total
0.980699
0.980704
0.981694
0.997834
0.996321
0.995564
0.997056
PBC1 = OneRead/Distinct
0.981223
0.981027
0.981931
0.997839
0.996349
0.99559
0.997065
PBC2 = OneRead/TwoRead
54.49222
53.525382
56.028907
463.61079
275.858988
228.048723
341.737404
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
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
rep3
Number of peaks
4602
3843
3959
Top 300000 raw peaks from spp with FDR 0.01
Peak calling statistics
Peak region size
rep1
rep2
rep3
idr_opt
overlap_opt
Min size
88.0
86.0
89.0
115.0
115.0
25 percentile
350.0
344.0
356.0
415.0
460.0
50 percentile (median)
350.0
344.0
356.0
460.0
460.0
75 percentile
350.0
344.0
356.0
495.0
460.0
Max size
755.0
732.0
724.0
1979.0
1979.0
Mean
346.509778357236
341.8196721311475
352.12679969689316
472.0173913043478
459.1037066246057
rep1rep2rep3idr_optoverlap_opt
Enrichment / Signal-to-noise ratio
Strand cross-correlation measures (trimmed/filtered SE BAM)
rep1
rep2
rep3
Number of Subsampled Reads
1571803
1263273
1137216
Estimated Fragment Length
145
160
165
Cross-correlation at Estimated Fragment Length
0.798932108422191
0.760720726468933
0.748524259597032
Phantom Peak
55
55
55
Cross-correlation at Phantom Peak
0.7810373
0.728351
0.7165261
Argmin of Cross-correlation
1500
1500
1500
Minimum of Cross-correlation
0.7231517
0.6589196
0.652985
NSC (Normalized Strand Cross-correlation coeff.)
1.104792
1.154497
1.146312
RSC (Relative Strand Cross-correlation coeff.)
1.309142
1.466212
1.503583
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
rep1rep2rep3
Peak enrichment
Fraction of reads in peaks (FRiP)
FRiP for spp raw peaks
rep1
rep2
rep3
rep1-pr1
rep2-pr1
rep3-pr1
rep1-pr2
rep2-pr2
rep3-pr2
pooled
pooled-pr1
pooled-pr2
Fraction of Reads in Peaks
0.3907475396928491
0.4011161658493788
0.3968499612857375
0.3818471753807705
0.40936329881401873
0.40477007688331823
0.3868516809555459
0.41426115088752763
0.4150839398742164
0.41703590007953034
0.40546487565356876
0.40290099171145227
FRiP for overlap peaks
rep1_vs_rep2
rep1_vs_rep3
rep2_vs_rep3
rep1-pr1_vs_rep1-pr2
rep2-pr1_vs_rep2-pr2
rep3-pr1_vs_rep3-pr2
pooled-pr1_vs_pooled-pr2
Fraction of Reads in Peaks
0.32881202248890157
0.32826926926988215
0.3226951049353502
0.28932885355145704
0.3140236021244262
0.3058159220101939
0.34666930747383123
FRiP for IDR peaks
rep1_vs_rep2
rep1_vs_rep3
rep2_vs_rep3
rep1-pr1_vs_rep1-pr2
rep2-pr1_vs_rep2-pr2
rep3-pr1_vs_rep3-pr2
pooled-pr1_vs_pooled-pr2
Fraction of Reads in Peaks
0.2671086651332026
0.24637659420365277
0.251712136917076
0.2204211271231082
0.26243654921744036
0.24739675607793732
0.2594444570294348
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