Phylogenetic analysis and molecular signatures defining a monophyletic clade of heterocystous cyanobacteria and identifying its closest relatives

  title={Phylogenetic analysis and molecular signatures defining a monophyletic clade of heterocystous cyanobacteria and identifying its closest relatives},
  author={Mohammad Howard-Azzeh and Larissa Shamseer and Herb E. Schellhorn and Radhey S. Gupta},
  journal={Photosynthesis Research},
Detailed phylogenetic and comparative genomic analyses are reported on 140 genome sequenced cyanobacteria with the main focus on the heterocyst-differentiating cyanobacteria. In a phylogenetic tree for cyanobacteria based upon concatenated sequences for 32 conserved proteins, the available cyanobacteria formed 8–9 strongly supported clades at the highest level, which may correspond to the higher taxonomic clades of this phylum. One of these clades contained all heterocystous cyanobacteria… 
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  • Biology
    International journal of systematic and evolutionary microbiology
  • 2009
The unique presence of these molecular signatures in all available sequences from the indicated groups of cyanobacteria, but not in any other cyanob bacteria, indicates that these synapomorphies provide novel and potentially useful means for circumscription of several important taxonomic clades of cyanOBacteria in more definitive terms.
Phylogenetic framework and molecular signatures for the class Chloroflexi and its different clades; proposal for division of the class Chloroflexi class. nov. into the suborder Chloroflexineae subord. nov., consisting of the emended family Oscillochloridaceae and the family Chloroflexaceae fam. nov.
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Molecular signatures for the main phyla of photosynthetic bacteria and their subgroups
The use of these signatures in conjunction with phylogenomic analyses, summarized here, is leading to a holistic picture concerning the branching order and evolutionary relationships among the above groups of photosynthetic bacteria.
The phylogeny of proteobacteria: relationships to other eubacterial phyla and eukaryotes.
  • R. Gupta
  • Biology
    FEMS microbiology reviews
  • 2000
An unexpected but important aspect of the relationship deduced here is that the main eubacterial phyla are related to each other linearly rather than in a tree-like manner, suggesting that the major evolutionary changes within Bacteria have taken place in a directional manner.
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Cyanobacterial genomes reveal a complex evolutionary history, which cannot be represented by a single strictly bifurcating tree for all genes or even most genes, although a single completely resolved phylogeny was recovered from the quartets' plurality signals.
Signature proteins for the major clades of Cyanobacteria
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By integrating phylogenetic data inferred for upward of 1,000 protein-coding genes common to all or most cyanobacteria, this work has reconstructed an evolutionary history of the phylum, establishing a framework for resolving key issues regarding the evolution of their metabolic and phenotypic diversity.
Evolutionary relationships among cyanobacteria and green chloroplasts
The results indicate that many diverse forms of cyanobacteria diverged within a short span of evolutionary distance and suggest that the chloroplast lineage, which includes the cyanelle of C. paradoxa, is not just a sister group to the free-living forms but rather is contained within the cyanobacterial radiation.