Phylogenetic and molecular clock inferences of cyanobacterial strains within Rivulariaceae from distant environments

Dominguez-Escobar, Julia; Beltrán, Yislem; Bergman, Birgitta; Dı́ez, Beatriz; Ininbergs, Karolina; Souza, Valeria; Falcón, Luisa I.

doi:10.1111/j.1574-6968.2010.02195.x

Cited by 21 publications

(18 citation statements)

References 33 publications

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“…m3-13 from B. megaterium (Fig. 4), and with the age obtained for filamentous cyanobacteria from the same site (Domínguez-Escobar et al, 2011). This implies the presence of very ancient photosynthetic bacteria that survived all the geological changes around the site.…”

Section: Molecular Datingsupporting

confidence: 70%

Divergence and Phylogeny of Firmicutes from the Cuatro Ciénegas Basin, Mexico: A Window to an Ancient Ocean

et al. 2012

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The Cuatro Ciénegas Basin (CCB) has been identified as a center of endemism for many life-forms. Nearly half the bacterial species found in the spring systems have their closest relatives in the ocean. This raises the question of whether the high diversity observed today is the product of an adaptive radiation similar to that of the Galapagos Islands or whether the bacterial groups are "survivors" of an ancient sea, which would be of interest for astrobiology. To help answer this question, we focused on Firmicutes from Cuatro Ciénegas (mainly Bacillus and Exiguobacterium). We reconstructed the phylogenetic relationships of Firmicutes with 28 housekeeping genes and dated the resulting tree using geological events as calibration points. Our results show that marine Bacillus diverged from other Bacillus strains 838 Ma, while Bacillus from Cuatro Ciénegas have divergence dates that range from 770 to 202 Ma. The members of Exiguobacterium from the CCB conform to a much younger group that diverged from the Andes strain 60 Ma and from the one in Yellowstone 183 Ma. Therefore, the diversity of Firmicutes in Cuatro Ciénegas is not the product of a recent radiation but the product of the isolation of lineages from an ancient ocean. Hence, Cuatro Ciénegas is not a Galapagos Archipelago for bacteria but is more like an astrobiological "time machine" in which bacterial lineages survived in an oligotrophic environment that may be very similar to that of the Precambrian. Key Words: Firmicutes-Cuatro Ciénegas-Precambrian-Molecular dating-Western Interior Seaway.

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Section: Molecular Datingsupporting

confidence: 70%

Divergence and Phylogeny of Firmicutes from the Cuatro Ciénegas Basin, Mexico: A Window to an Ancient Ocean

et al. 2012

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“…However, a prior report has suggested that the sequence EU009149 was incorrectly identified, and pertains to Calothrix , which is in good agreement with the analysis presented here. 35 The Calothrix strains that fell outside of the Calothrix clade were most likely misidentified as Calothrix , probably as a result of a morphology based identification.…”

Section: Resultsmentioning

confidence: 99%

Viequeamide A, a Cytotoxic Member of the Kulolide Superfamily of Cyclic Depsipeptides from a Marine Button Cyanobacterium

et al. 2012

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The viequeamides, a family of 2,2-dimethyl-3-hydroxy-7-octynoic acid (Dhoya) containing cyclic depsipeptides, were isolated from a shallow subtidal collection of a ‘button’ cyanobacterium (Rivularia sp.) from near the island of Vieques, Puerto Rico. Planar structures of the two major compounds, viequeamide A (1) and viequeamide B (2), were elucidated by 2D-NMR spectroscopy and mass spectrometry, whereas absolute configurations were determined by traditional hydrolysis, derivative formation, and chromatography in comparison with standards. In addition, a series of related minor metabolites, viequeamide C–F (3–6), were characterized by high resolution mass spectroscopic (HRMS) fragmentation methods. Viequeamide A was found to be highly toxic to H460 human lung cancer cells (IC50 = 60 ± 10 nM), whereas the mixture of B–F was inactive. From a broader perspective, the viequeamides help to define a “superfamily” of related cyanobacterial natural products, the first of which to be discovered was ‘kulolide’. Within the kulolide superfamily, a wide variation in biological properties is observed, and the reported producing strains are also highly divergent, giving rise to several intriguing questions about structure-activity relationships and the evolutionary origins of this metabolite class.

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“…Previous work at CCB reported filamentous cyanobacteria as often the most abundant organisms within microbial mats and microbialites observed in the system (Domínguez‐Escobar et al. , Bonilla‐Rosso et al. ).…”

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confidence: 92%

A bridge too far in naming species: a total evidence approach does not support recognition of four species in Desertifilum (Cyanobacteria)

González-Resendiz

Johansen

León‐Tejera

et al. 2019

Journal of Phycology

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A population of Desertifilum (Cyanobacteria, Oscillatoriales) from an oligotrophic desertic biotope was isolated and characterized using a polyphasic approach including molecular, morphological, and ecological information. The population was initially assumed to be a new species based on ecological and biogeographic separation from other existing species, however, phylogenetic analyses based on sequences of the 16S rRNA gene and 16S–23S ITS region, placed this strain clearly within the type species, Desertifilum tharense. Comparative analysis of morphology, 16S rRNA gene similarity, 16S–23S ITS secondary structure, and percent dissimilarity of the ITS regions for all characterized strains supports placing the six Desertifilum strains (designated as PD2001/TDC17, UAM‐C/S02, CHAB7200, NapGTcm17, IPPAS B‐1220, and PMC 872.14) into D. tharense. The recognition of Desertifilum salkalinema and Desertifilum dzianense is not supported, although our analysis does support continued recognition of Desertifilum fontinale. Pragmatic criteria for recognition of closely related species are proposed based on this study and others, and more rigorous review of future taxonomic papers is recommended.

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Phylogenetic and molecular clock inferences of cyanobacterial strains within Rivulariaceae from distant environments

Cited by 21 publications

References 33 publications

Divergence and Phylogeny of Firmicutes from the Cuatro Ciénegas Basin, Mexico: A Window to an Ancient Ocean

Divergence and Phylogeny of Firmicutes from the Cuatro Ciénegas Basin, Mexico: A Window to an Ancient Ocean

Viequeamide A, a Cytotoxic Member of the Kulolide Superfamily of Cyclic Depsipeptides from a Marine Button Cyanobacterium

A bridge too far in naming species: a total evidence approach does not support recognition of four species in Desertifilum (Cyanobacteria)

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