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Table 1 General characteristics of O. bayeri and other microsporidian genomes

From: Draft genome sequence of the Daphnia pathogen Octosporea bayeri: insights into the gene content of a large microsporidian genome and a model for host-parasite interactions

General characteristics O. bayeri Enc. cuniculi Ent. Bieneusi
Number of chromosomes NA 11 6
Genome size (Mb) ≤24.2* 2.9 6
Assembled Mb 13.3 2.5 3.86
Genome coverage (%) 55 86 64
G+C content (%) 26 47 25
Gene density 1 per 4,593 bases 1 per 1,025 bases 1 per 1,148 bases
Mean intergenic region (bp) 429§ 129 127
Presence of overlapping genes No Yes Yes
Number of SSU-LSU rRNA genes 2 22 Unkown¥
Number of 5S rRNA genes 2 3 Unkown¥
Number of tRNAs 37 46 46
Number of tRNA synthetases 21 21 21
Number of tRNA introns (size in bp) ≥1 (50) 2 (16, 42) 2 (13, 30)
Number of splicesomal introns (size in bp) ≥6 (24-33) 13 (23-52) 19 (36-306)
Number of predicted ORFs 2,174# 1,997 3,804**
Number of ORFs assigned to functional categories 894 (41%) 884 (44%) 669 (39%)
Mean size of CDS (bp) 1,056†† 1,017†† 1,002††
  1. *The genome size has been estimated using total number of bases sequenced divided by the average coverage. Based on the 24.2-Mb estimated genome size. Based on the 200 largest contigs. §Based on contigs (n = 23) in which two or more ORFs of at least 100 amino acids have been identified. Only two contigs harboring an SSU-5.8S-LSU gene array have been identified in the O. bayeri genome survey. ¥Based on [33]. #Includes ORFs with assigned functions, homologs of Enc. cuniculi hypothetical proteins, and hypothetical proteins of at least 200 amino acids identified in the O. bayeri genome. **The Ent. bieneusi genome has been subjected to several segmental duplications and the number of ORFs identified in that study includes a very large number of duplicates [33]. This number should, therefore, not be taken into account to determine the haploid coding capacity of this species. ††Based on 95 and 63 complete Enc. cuniculi and Ent. bieneusi orthologs, respectively. CDS, coding sequence.