Human vs Shrew LastZ results

Human (Homo sapiens, GRCh38) and Shrew (Sorex araneus, COMMON_SHREW1) 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

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

Statistics over 1,135,993 alignment blocks

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

Uncovered: 2,484,005,392 out of 3,096,649,726
Covered: 612,644,334 out of 3,096,649,726

Uncovered: 9,346,843 out of 35,444,608
Matches: 21,102,208 out of 35,444,608
Mismatches: 4,653,029 out of 35,444,608
Insertions: 342,528 out of 35,444,608
Identity over aligned base-pairs: 80.9%

Shrew

Uncovered: 2,378,900,818 out of 2,944,193,050
Covered: 565,292,232 out of 2,944,193,050

Uncovered: 3,992,335 out of 20,841,358
Matches: 14,271,079 out of 20,841,358
Mismatches: 2,532,554 out of 20,841,358
Insertions: 45,390 out of 20,841,358
Identity over aligned base-pairs: 84.7%

Block size distribution

Size range All 1,135,993 alignment blocks Blocks grouped in nets
# blocks Total size (incl. gaps) # nets Total size (incl. gaps)
1 bp - 10 bp
14,931
96.6 kb
10 bp - 100 bp
104,790
6.2 Mb
15,352
1.1 Mb
100 bp - 1 kb
838,274
367.9 Mb
123,335
54.7 Mb
1 kb - 10 kb
177,980
272.6 Mb
82,750
233.5 Mb
10 kb - 100 kb
18
202.6 kb
10,437
273.0 Mb
100 kb - 1 Mb
528
84.8 Mb