Human vs Australian saltwater crocodile LastZ results

Human (Homo sapiens, GRCh38) and Australian saltwater crocodile (Crocodylus porosus, CroPor_comp1) were aligned using the LastZ alignment algorithm (LastZ) in Ensembl release 96. Human was used as the reference species. After running LastZ, the raw LastZ alignment blocks were chained according to their location in both genomes. During the final netting process, the best sub-chain was chosen in each region on the reference species.

Configuration parameters

ParameterValue
Gap open penalty (O)400
Gap extend penalty (E)30
HSP threshold (K)3000
Threshold for gapped extension (L)3000
Threshold for alignments between gapped alignment blocks (H)2200
Masking count (M)
Seed and Transition value (T)1
Scoring matrix (Q)
Default:
     A    C    G    T
    91 -114  -31 -123
  -114  100 -125  -31
   -31 -125  100 -114
  -123  -31 -114   91

Chunking parameters

ParameterHumanAustralian saltwater crocodile
Chunk size30,000,00010,100,000
Overlap0100,000
Group set size010,100,000
Masking options{default_soft_masking => 1}{default_soft_masking => 1}

Statistics over 318,757 alignment blocks

Genome coverage (bp) Coding exon coverage (bp)
Human

Uncovered: 2,999,573,709 out of 3,096,649,726
Covered: 97,076,017 out of 3,096,649,726

Uncovered: 9,515,969 out of 35,604,148
Matches: 19,273,439 out of 35,604,148
Mismatches: 6,503,123 out of 35,604,148
Insertions: 311,617 out of 35,604,148
Identity over aligned base-pairs: 73.9%

Australian saltwater crocodile

Uncovered: 1,968,637,530 out of 2,049,536,252
Covered: 80,898,722 out of 2,049,536,252

Uncovered: 4,582,645 out of 26,208,359
Matches: 16,221,064 out of 26,208,359
Mismatches: 5,140,791 out of 26,208,359
Insertions: 263,859 out of 26,208,359
Identity over aligned base-pairs: 75.0%

Block size distribution

Size range All 318,757 alignment blocks Blocks grouped in nets
# blocks Total size (incl. gaps) # nets Total size (incl. gaps)
1 bp - 10 bp
548
2.8 kb
10 bp - 100 bp
37,899
2.8 Mb
13,180
976.0 kb
100 bp - 1 kb
267,990
77.8 Mb
113,366
39.1 Mb
1 kb - 10 kb
12,268
19.2 Mb
16,472
37.7 Mb
10 kb - 100 kb
48
1.4 Mb
707
16.4 Mb
100 kb - 1 Mb
4
473.8 kb
44
7.6 Mb