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Table 1 Distribution of syntenic block sizes (≥3 genes) at the root of the Drosophila tree under various relaxed criteria

From: Inferring genome-scale rearrangement phylogeny and ancestral gene order: a Drosophilacase study

  No. of blocks
Syntenic block size (no. of genes) Criterion 1 Criterion 2 Criterion 3
3 283 279 162
4 119 113 57
5 137 136 67
6 86 82 52
7 73 71 55
8 54 59 53
9 34 30 29
10 39 35 33
11 36 33 27
12 26 28 19
13 22 23 28
14 22 24 27
15 16 15 18
16 11 13 14
17 9 12 10
18 9 10 9
19 6 5 7
20 7 7 9
21 6 5 7
22 5 5 7
23 1 3 6
24 4 4 6
25 2 2 4
26 4 4 5
27 2 2 6
28 2 2 2
29 4 3 5
30 1 2 4
31 0 1 5
32 3 2 5
33 2 3 2
35 0 0 2
36 1 1 2
38 0 0 1
39 1 1 1
40 1 1 2
41 0 1 1
43 0 0 1
44 0 0 1
46 0 0 1
47 0 0 2
48 1 1 1
51 0 0 1
54 0 0 1
61 0 0 1
  1. Note that criterion 2 is weaker than criterion 1 and criterion 3 includes the weakest assumptions. Criterion 1: first-pass syntenic blocks. Criterion 2: result of bridging syntenic blocks with genes on block edges paired using outgroup species evidence. Criterion 3: further merging of syntenic blocks based on relaxed assumption of bridging blocks using genes on block edges paired in at least one fly species. See Additional data files 6 and 7 for gene composition of blocks.