Sequencing and analysis of the complete organellar genomes of Parmales, a closely related group to Bacillariophyta (diatoms)
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- 作者：Naoyuki Tajima ; Kenji Saitoh ; Shusei Sato ; Fumito Maruyama…
- 关键词：Genome sequencing ; Heterokonta ; Mitochondrial genome ; Parmales ; Plastid genome ; Triparma laevis
- 刊名：Current Genetics
- 出版年：2016
- 出版时间：November 2016
- 年：2016
- 卷：62
- 期：4
- 页码：887-896
- 全文大小：1,024 KB
- 刊物类别：Biomedical and Life Sciences
- 刊物主题：Life Sciences
Microbial Genetics and Genomics
Microbiology
Biochemistry
Cell Biology
Plant Sciences
Proteomics - 出版者：Springer Berlin / Heidelberg
- ISSN：1432-0983
- 卷排序：62
文摘
We sequenced the complete plastid and mitochondrial genomes of the unicellular marine phytoplankton Triparma laevis, belonging to the order Parmales (Heterokonta). The cells of Parmales are surrounded by silicified cell walls, similar to Bacillariophyta (diatoms). T. laevis was recognized as a sister group of Bacillariophyta using a molecular phylogenetic analysis based on SSU rDNA and rbcL sequences. Bacillariophyta are the most successful group of phytoplankton in the modern ocean, but the origin and early evolution of them have not been clearly established. Detailed molecular analyses of T. laevis may increase our understanding of the evolutionary relationships among Parmales and Bacillariophyta. The gene contents of the plastid and mitochondrial genomes are similar between T. laevis and Bacillariophyta. The gene order of the plastid genome is also similar to Bacillariophyta, whereas the gene order of the mitochondrial genome is not conserved in Bacillariophyta, but the structure is more compact than Bacillariophyta. Phylogenetic analyses, using plastid-encoded concatenated amino acid datasets and mitochondria-encoded concatenated amino acid datasets suggest that T. laevis is a sister group of Bacillariophyta. These results suggest that the characteristics of the organellar genomes of T. laevis are similar and conserve ancestral characteristics more than Bacillariophyta.