Human vs Coelacanth LastZ results

Human (Homo sapiens, GRCh38) and Coelacanth (Latimeria chalumnae, LatCha1) were aligned using the LastZ alignment algorithm (LastZ) in Ensembl release 76. 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

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

Statistics over 232,966 alignment blocks

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

Uncovered: 3,046,211,181 out of 3,096,649,726
Covered: 50,438,545 out of 3,096,649,726

Uncovered: 10,694,946 out of 35,228,305
Matches: 17,365,625 out of 35,228,305
Mismatches: 6,864,592 out of 35,228,305
Insertions: 303,142 out of 35,228,305
Identity over aligned base-pairs: 70.8%

Coelacanth

Uncovered: 2,821,946,224 out of 2,860,591,921
Covered: 38,645,697 out of 2,860,591,921

Uncovered: 10,939,186 out of 30,870,617
Matches: 14,151,635 out of 30,870,617
Mismatches: 5,524,418 out of 30,870,617
Insertions: 255,378 out of 30,870,617
Identity over aligned base-pairs: 71.0%

Block size distribution

Size range All 232,966 alignment blocks Blocks grouped in nets
# blocks Total size (incl. gaps) # nets Total size (incl. gaps)
1 bp - 10 bp
720
3.0 kb
10 bp - 100 bp
36,379
2.8 Mb
18,072
1.4 Mb
100 bp - 1 kb
192,666
44.3 Mb
112,356
32.2 Mb
1 kb - 10 kb
3,199
4.9 Mb
8,303
16.3 Mb
10 kb - 100 kb
2
30.7 kb
121
2.0 Mb
100 kb - 1 Mb
1
121.7 kb