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Abstract
The complete mitochondrial DNA of common planktonic diatom, Skeletonema marinoi JK029 was sequenced and characterized. The circular mitogenome contains 62 genes in 38 515 bp (29.7% GC), including 35 protein-coding, 2 rRNA, and 25 tRNA genes. Total 80% of protein-coding genes have usual ATG start codon and 20% have alternative start codons. The GC content of tRNA genes (39.8%) is relatively higher than those of the rRNA (32.9%) and CDS (29.3%). There are four cases of gene overlapping between neighboring genes, i.e., rrs-trnM, rps2-rps4, nad1-tatC, and rps11-trnY. Newly determined mitogenome of S. marinoi was compared with available seven diatoms and eight stramenopiles by using the maximum-likelihood analysis. The 34-CDS concatenated data (8528 amino acids) support the monophyly of Bacillariophyta. However, mitogenome data showed different higher class-levels clustering with previous study. These results suggested that additional mitogenome data will provide useful information for mitochondrial genome diversity and evolution of the diatoms and stramenopiles.
Acknowledgements
The authors thank Mr. Seong Jun Chun the sample collection.
Declaration of interest
The authors are responsible for the content and writing of the paper. The authors report no conflicts of interest. This work was supported by grants from the Basic Science Research Program through the National Research Foundation of Korea (NRF) founded by the Ministry of Science, ICT and Future Planning (NRF-2014R1A1A1006512) to E. C. Y and the Korea Institute of Ocean Science & Technology (PE99319) to J. H. N.
