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Table 2 Partition of D. melanogaster genes into age groups

From: Codon usage is associated with the evolutionary age of genes in metazoan genomes

a      
D. melanogater gene is in Age group: If the furthest species containing a homologue is among:     
1 D. melanogaster, D. sechellia, D. simulans, D. erecta, D. yakuba     
2 D. ananassae     
3 D. pseudoobscura, D. persimilis     
4 D. wilistoni     
5 D. mojavensis, D. grimshawi, D. virilis     
6 Ades aegypti., Anopheles gambiae.     
7 Vertebrates, C. elegans     
8 Saccharomyces cerevisiae     
b      
Age group # genes Coding region GC content Protein length
   Mean SD Mean SD
1 336 0.49 ± 0.06 412 ± 892
2 130 0.49 ± 0.06 401 ± 406
3 160 0.49 ± 0.06 394 ± 245
4 147 0.51 ± 0.06 456 ± 421
5 2582 0.54 ± 0.06 568 ± 691
6 1841 0.55 ± 0.05 650 ± 625
7 3155 0.55 ± 0.04 578 ± 471
8 2632 0.55 ± 0.04 543 ± 406
Total 10983     
  1. Partition of all genes in D. melanogaster into 8 non-overlapping age groups along the evolutionary tree. (a) Genes were divided into 8 age groups. The 6 youngest groups (1 to 6) are a "high-resolution" partition, enabled by the recent sequencing of 12 members of the Drosophilidae family and 2 mosquito species. (b) For each age group, the number of genes it contains, its average GC content (with standard deviation), and the average length of proteins (number of amino acids/codons analyzed) that its genes encode (with standard deviation) are listed.