Human vs Opossum LastZ results

Human (Homo sapiens, GRCh38) and Opossum (Monodelphis domestica, ASM229v1) were aligned using the LastZ alignment algorithm (LastZ) in Ensembl release 98. 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

ParameterHumanOpossum
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 542,076 alignment blocks

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

Uncovered: 2,863,290,012 out of 3,096,649,726
Covered: 233,359,714 out of 3,096,649,726

Uncovered: 4,605,944 out of 35,628,222
Matches: 23,807,886 out of 35,628,222
Mismatches: 6,869,175 out of 35,628,222
Insertions: 345,217 out of 35,628,222
Identity over aligned base-pairs: 76.7%

Opossum

Uncovered: 3,384,280,901 out of 3,600,504,728
Covered: 216,223,827 out of 3,600,504,728

Uncovered: 8,350,863 out of 35,083,223
Matches: 20,733,778 out of 35,083,223
Mismatches: 5,643,898 out of 35,083,223
Insertions: 354,684 out of 35,083,223
Identity over aligned base-pairs: 77.6%

Block size distribution

Size range All 542,076 alignment blocks Blocks grouped in nets
# blocks Total size (incl. gaps) # nets Total size (incl. gaps)
1 bp - 10 bp
1,299
7.9 kb
10 bp - 100 bp
41,044
2.8 Mb
12,511
906.5 kb
100 bp - 1 kb
447,366
177.0 Mb
136,472
57.2 Mb
1 kb - 10 kb
52,239
83.5 Mb
35,228
80.6 Mb
10 kb - 100 kb
121
2.1 Mb
2,170
51.8 Mb
100 kb - 1 Mb
7
907.4 kb
237
59.8 Mb
1 Mb - 10 Mb
9
16.1 Mb