Table 1.
General features of the plastid and nuclear genomes of Prototheca spp., Helicosporidium sp., Auxenochlorella protothecoides, and Chlorella variabilis.
| Organisms | C. variabilis | A. protothecoides | P. wickerhamii | P. cutis | P. stagnora | Helicosporidium sp. |
|---|---|---|---|---|---|---|
| Plastid genomes | ||||||
| Reference | HQ914635.1 | Yan et al.19 | Yan et al.19 | This study | This study | de Koning and Keeling20 |
| Genome size (kb) | 124.6 | 84.6 | 55.6 | 51.7 | 48.2 | 37.5 |
| GC% | 33.9 | 30.8 | 31.2 | 29.7 | 25.7 | 26.9 |
| Genes | 115 | 111 | 72 | 72 | 56 | 54 |
| Proteins | 80 | 77 | 41 | 40 | 28 | 26 |
| Photosynthetic proteins* | 37 | 37 | 6 (atp) | 6 (atp) | 0 | 0 |
| tRNAs | 32 | 31 | 28 | 29 | 25 | 25 |
| rRNAs | 3 | 3 | 3 | 3 | 3 | 3 |
| Spacer (bp) | 460 | 119 | 122 | 54 | 98 | 36 |
| Nuclear genomes | ||||||
| Reference | Blanc et al. 2012 | Gao et al.46 | Not available | This study | This study | Pombert et al.21 |
| Assembly size (Mb) | 46.2 | 22.9 | 20.0 | 16.9 | 12.4 | |
| GC% | 67 | 63 | 60.3 | 71.4 | 61.7 | |
| Proteins | 9,791 | 7,039 | 6,884 | 7,041 | 6,035 | |
| Average exon size | 170 | 207 | 276.8 | 467.5 | 366 | |
| Average intron size | 209 | 246 | 204.4 | 290.3 | 168 | |
| Number of exons per gene | 7.3 | 5.7 | 5.4 | 4.0 | 2.3 | |
| Coding%** | 18.8 | 36.4 | 49.3 | 67.6 | 41.0 | |
*Excluding conserved genes ycf1, 3, 4, 12, 20. **Excluding intergenic regions, introns, and ncRNAs.