期刊
GENOME BIOLOGY AND EVOLUTION
卷 6, 期 8, 页码 2170-2180出版社
OXFORD UNIV PRESS
DOI: 10.1093/gbe/evu172
关键词
collinearity; gene fragmentation; genome rearrangements; green algae; rRNA
资金
- National Science Foundation [DEB-1036448]
- Division Of Environmental Biology
- Direct For Biological Sciences [1036448] Funding Source: National Science Foundation
The majority of our knowledge about mitochondrial genomes of Viridiplantae comes from land plants, but much less is known about their green algal relatives. In the green algal order Sphaeropleales (Chlorophyta), only one representative mitochondrial genome is currently available-that of Acutodesmus obliquus. Our study adds nine completely sequenced and three partially sequenced mitochondrial genomes spanning the phylogenetic diversity of Sphaeropleales. We show not only a size range of 25-53 kb and variation in intron content (0-11) and gene order but also conservation of 13 core respiratory genes and fragmented ribosomal RNA genes. We also report an unusual case of gene arrangement convergence in Neochloris aquatica, where the two rns fragments were secondarily placed in close proximity. Finally, we report the unprecedented usage of UCG as stop codon in Pseudomuriella schumacherensis. In addition, phylogenetic analyses of the mitochondrial protein-coding genes yield a fully resolved, well-supported phylogeny, showing promise for addressing systematic challenges in green algae.
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