Human vs Alpaca LastZ results

Human (Homo sapiens, GRCh38) and Alpaca (Vicugna pacos, vicPac1) 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
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

ParameterHumanAlpaca
Chunk size30,000,00010,100,000
Overlap0100,000
Group set size10,100,000
Masking options{default_soft_masking => 1}

Statistics over 1,550,179 alignment blocks

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

Uncovered: 1,932,413,351 out of 3,099,750,718
Covered: 1,167,337,367 out of 3,099,750,718

Uncovered: 11,671,681 out of 38,571,754
Matches: 22,602,188 out of 38,571,754
Mismatches: 3,997,696 out of 38,571,754
Insertions: 300,189 out of 38,571,754
Identity over aligned base-pairs: 84.0%

Alpaca

Uncovered: 1,876,367,219 out of 2,967,746,133
Covered: 1,091,378,914 out of 2,967,746,133

Uncovered: 2,803,367 out of 19,005,742
Matches: 14,444,182 out of 19,005,742
Mismatches: 1,726,202 out of 19,005,742
Insertions: 31,991 out of 19,005,742
Identity over aligned base-pairs: 89.1%

Block size distribution

Size range All 1,550,179 alignment blocks Blocks grouped in nets
# blocks Total size (incl. gaps) # nets Total size (incl. gaps)
1 bp - 10 bp
17,305
111.6 kb
10 bp - 100 bp
126,841
7.7 Mb
20,801
1.5 Mb
100 bp - 1 kb
987,254
456.1 Mb
120,483
53.3 Mb
1 kb - 10 kb
418,664
754.8 Mb
57,416
138.0 Mb
10 kb - 100 kb
115
1.3 Mb
5,367
172.0 Mb
100 kb - 1 Mb
2,227
649.0 Mb
1 Mb - 10 Mb
148
206.2 Mb