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
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 size10,100,000
Masking options{default_soft_masking => 1}{default_soft_masking => 1}

Statistics over 523,256 alignment blocks

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

Uncovered: 2,866,391,004 out of 3,099,750,718
Covered: 233,359,714 out of 3,099,750,718

Uncovered: 6,825,955 out of 38,571,754
Matches: 24,274,704 out of 38,571,754
Mismatches: 7,076,539 out of 38,571,754
Insertions: 394,556 out of 38,571,754
Identity over aligned base-pairs: 76.5%

Opossum

Uncovered: 3,385,013,689 out of 3,600,504,728
Covered: 215,491,039 out of 3,600,504,728

Uncovered: 8,374,639 out of 35,083,223
Matches: 20,754,239 out of 35,083,223
Mismatches: 5,599,212 out of 35,083,223
Insertions: 355,133 out of 35,083,223
Identity over aligned base-pairs: 77.7%

Block size distribution

Size range All 523,256 alignment blocks Blocks grouped in nets
# blocks Total size (incl. gaps) # nets Total size (incl. gaps)
1 bp - 10 bp
1,203
7.3 kb
10 bp - 100 bp
39,165
2.7 Mb
11,838
857.8 kb
100 bp - 1 kb
432,220
171.2 Mb
130,208
54.8 Mb
1 kb - 10 kb
50,593
80.9 Mb
34,194
78.2 Mb
10 kb - 100 kb
73
1.2 Mb
2,079
49.7 Mb
100 kb - 1 Mb
2
212.1 kb
223
56.5 Mb
1 Mb - 10 Mb
9
16.1 Mb