Complete DNA sequences were determined for the mitochondrial (mt) genomes of the sea anemones, Mesactinia genesis ¡]20,544 bp¡^, Heteractis aurora (19,800 bp) and partial mtDNA between cox2 and nad4 of the Calliactis sp. (3,713 bp). In addition, complete mtDNA sequences were determined for the sea squirt, Eudistoma gilboviride (14,203 bp). The circular, sea anemones genomes contain the genes for 13 energy pathway proteins and two ribosomal RNAs and two transfer RNAs. H. aurora contains a previously undescribed ORF between the cox2 and nad4 genes encoding a putative protein of 646 amino acids. In M. geneisis and Calliactis sp. encodes two separate smaller ORFs of 259 and 243 as well as 269 and 345 in the corresponding regions, respectively. Possible control region of the mitochondrial genomes of M. geneisis and H. aurora were identified in the intergenic region 13. The sea squirt genomes contain the genes for 11 energy pathway proteins and two rRNAs and 22 tRNAs. All genes are encoded by the heavy strand, except for trnM, trnK, and trnV, which are encoded by the light strand. The ascidians showed frequent and extensive gene rearrangement. The gene order in E. gilboviride are very much different from the other ascidians mt-genome. The E. gilboviride mtDNA does not encode the nad6 and a tpyical atp8. Molecular phylogenetic analyses based on nucleic acid and amino acid sequences of the deuterostome (echinoderms, chordate and Xenoturbella), and cnidaria coincide with the morphological characters.
| Identifer | oai:union.ndltd.org:NSYSU/oai:NSYSU:etd-0819109-130905 |
| Date | 19 August 2009 |
| Creators | Huang, Tzu-yun |
| Contributors | Zhi-Hong Wen, Chi-Hsin Hsu, Chan-Shing Lin |
| Publisher | NSYSU |
| Source Sets | NSYSU Electronic Thesis and Dissertation Archive |
| Language | Cholon |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0819109-130905 |
| Rights | not_available, Copyright information available at source archive |
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