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Highly Conserved Mitochondrial Genomes among Multicellular Red Algae of the Florideophyceae.


ABSTRACT: Two red algal classes, the Florideophyceae (approximately 7,100 spp.) and Bangiophyceae (approximately 193 spp.), comprise 98% of red algal diversity in marine and freshwater habitats. These two classes form well-supported monophyletic groups in most phylogenetic analyses. Nonetheless, the interordinal relationships remain largely unresolved, in particular in the largest subclass Rhodymeniophycidae that includes 70% of all species. To elucidate red algal phylogenetic relationships and study organelle evolution, we determined the sequence of 11 mitochondrial genomes (mtDNA) from 5 florideophycean subclasses. These mtDNAs were combined with existing data, resulting in a database of 25 florideophytes and 12 bangiophytes (including cyanidiophycean species). A concatenated alignment of mt proteins was used to resolve ordinal relationships in the Rhodymeniophycidae. Red algal mtDNA genome comparisons showed 47 instances of gene rearrangement including 12 that distinguish Bangiophyceae from Hildenbrandiophycidae, and 5 that distinguish Hildenbrandiophycidae from Nemaliophycidae. These organelle data support a rapid radiation and surprisingly high conservation of mtDNA gene syntheny among the morphologically divergent multicellular lineages of Rhodymeniophycidae. In contrast, we find extensive mitochondrial gene rearrangements when comparing Bangiophyceae and Florideophyceae and multiple examples of gene loss among the different red algal lineages.

SUBMITTER: Yang EC 

PROVIDER: S-EPMC4558864 | biostudies-literature | 2015 Aug

REPOSITORIES: biostudies-literature

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Highly Conserved Mitochondrial Genomes among Multicellular Red Algae of the Florideophyceae.

Yang Eun Chan EC   Kim Kyeong Mi KM   Kim Su Yeon SY   Lee JunMo J   Boo Ga Hun GH   Lee Jung-Hyun JH   Nelson Wendy A WA   Yi Gangman G   Schmidt William E WE   Fredericq Suzanne S   Boo Sung Min SM   Bhattacharya Debashish D   Yoon Hwan Su HS  

Genome biology and evolution 20150804 8


Two red algal classes, the Florideophyceae (approximately 7,100 spp.) and Bangiophyceae (approximately 193 spp.), comprise 98% of red algal diversity in marine and freshwater habitats. These two classes form well-supported monophyletic groups in most phylogenetic analyses. Nonetheless, the interordinal relationships remain largely unresolved, in particular in the largest subclass Rhodymeniophycidae that includes 70% of all species. To elucidate red algal phylogenetic relationships and study orga  ...[more]

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