Table 1.
Comparison of Chlamydomonas genome statistics to those of selected sequenced genomes. nd, Not determined. [Source for all but Chlamydomonas (1)]
| Chlamydomonas | Ostreococcus tauri | Cyanidioschyzon | Arabidopsis | Human | |
|---|---|---|---|---|---|
| Assembly length (Mb) | 121 | 12.6 | 16.5 | 140.1 | 2,851 |
| Coverage | 13× | 6.7× | 11× | nd | ∼8× |
| Chromosomes | 17 | 20 | 20 | 5 | 23 |
| G+C (%) | 64 | 58 | 55 | 36 | 41 |
| G+C (%) coding sequence | 68 | 59 | 57 | 44 | 52 |
| Gene number | 15,143 | 8,166 | 5,331 | 26,341 | ∼23,000 |
| Genes with EST support (%) | 63 | 36 | 86 | 60 | nd |
| Gene density (per kb) | 0.125 | 0.648 | 0.323 | 0.190 | ∼0.0008 |
| Average bp per gene | 4312 | nd | 1553 | 2232 | 27,000 |
| Average bp per transcript | 1580 | 1257 | 1552 | nd | nd |
| Average number of amino acids per polypeptide | 444 | 387 | 518 | 413 | 491 |
| Average number of exons per gene | 8.33 | 1.57 | 1.005 | 5.2 | 8.8 |
| Average exon length | 190 | 750 | 1540 | 251 | 282* |
| Genes with introns (%) | 92 | 39 | 0.5 | 79 | 85† |
| Mean length of intron | 373 | 103 | 248 | 164 | 3,365 |
| Coding sequence (%) | 16.7 | 81.6 | 44.9 | 33.0 | ∼1 |
| Number of rDNA units (28S/18S/5.8S + 5S) | 3 + 3 | 4 + 4 | 3 + 3‡ | 12 + 700 | 5 + nd |
| Number tRNAs | 259§ | nd | 30 | 589 | 497 |
| Selenocysteine (Sec) tRNAs | 1 | nd | nd | 0 | 1 |
*
National Center for Biotechnology Information (NIH) NCBI 36 from Ensembl build 38.
†
[Source (56)].
‡
Three regions contain 5S rDNA exclusively, and three regions contain 28S-18S-5.8S rDNAs exclusively.
§
65 tRNAs that were included in SINE elements were removed from the tRNA-scanSE predictions.