Highly conserved mitochondrial genomes among multicellular red algae of the florideophyceae

Eun Chan Yang, Kyeong Mi Kim, Su Yeon Kim, Jun Mo Lee, Ga Hun Boo, Jung Hyun Lee, Wendy A. Nelson, Gangman Yi, William E. Schmidt, Suzanne Fredericq, Sung Min Boo, Debashish Bhattacharya, Hwan Su Yoon

Research output: Contribution to journalArticlepeer-review

68 Scopus citations

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.

Original languageEnglish
Pages (from-to)2394-2406
Number of pages13
JournalGenome Biology and Evolution
Volume7
Issue number8
DOIs
StatePublished - 1 Aug 2015

Keywords

  • Florideophyceae
  • Mitochondrial genome
  • Ordinal relationship
  • Red algal evolution
  • Rhodophytes
  • Rhodymeniophycidae

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