Modeling and Simulation


Publications (8)

Distribution, abundance, and ecogenomics of the Palauibacterales , a new cosmopolitan thiamine-producing order within the Gemmatimonadota phylum

Citation
Aldeguer-Riquelme et al. (2023). mSystems
Names (25)
Palauibacter ramosifaciens Palauibacter polyketidifaciens Kutchimonas denitrificans Ts Carthagonibacter metallireducens Ts Palauibacter denitrificans Palauibacter irciniicola Palauibacter australiensis Palauibacter poriticola Palauibacter rhopaloidicola Palauibacter scopulicola Palauibacter soopunensis Ts Benthicola azotiphorus Indicimonas acetifermentans Ts Benthicola marisminoris Ts Caribbeanibacter nitroreducens Ts Humimonas hydrogenitrophica Ts Kutchimonas Indicimonas Carthagonibacter Caribbeanibacter Humimonas Benthicola Palauibacter Palauibacterales Palauibacteraceae
Subjects
Biochemistry Computer Science Applications Ecology, Evolution, Behavior and Systematics Genetics Microbiology Modeling and Simulation Molecular Biology Physiology
Abstract
ABSTRACT The phylum Gemmatimonadota comprises mainly uncultured microorganisms that inhabit different environments such as soils, freshwater lakes, marine sediments, sponges, or corals. Based on 16S rRNA gene studies, the group PAUC43f is one of the most frequently retrieved Gemmatimonadota in marine samples. However, its physiology and ecological roles are completely unknown since, to date, not a single PAUC43f isolate or metagenome-assembled genome (MAG) has been characterized. Here, we carried out a broad study of the distribution, abundance, ecotaxonomy, and metabolism of PAUC43f, for which we propose the name of Palauibacterales . This group was detected in 4,965 16S rRNA gene amplicon datasets, mainly from marine sediments, sponges, corals, soils, and lakes, reaching up to 34.3% relative abundance, which highlights its cosmopolitan character, mainly salt-related. The potential metabolic capabilities inferred from 52 Palauibacterales MAGs recovered from marine sediments, sponges, and saline soils suggested a facultative aerobic and chemoorganotrophic metabolism, although some members may also oxidize hydrogen. Some Palauibacterales species might also play an environmental role as N 2 O consumers as well as suppliers of serine and thiamine. When compared to the rest of the Gemmatimonadota phylum, the biosynthesis of thiamine was one of the key features of the Palauibacterales . Finally, we show that polysaccharide utilization loci (PUL) are widely distributed within the Gemmatimonadota so that they are not restricted to Bacteroidetes , as previously thought. Our results expand the knowledge about this cryptic phylum and provide new insights into the ecological roles of the Gemmatimonadota in the environment. IMPORTANCE Despite advances in molecular and sequencing techniques, there is still a plethora of unknown microorganisms with a relevant ecological role. In the last years, the mostly uncultured Gemmatimonadota phylum is attracting scientific interest because of its widespread distribution and abundance, but very little is known about its ecological role in the marine ecosystem. Here we analyze the global distribution and potential metabolism of the marine Gemmatimonadota group PAUC43f, for which we propose the name of Palauibacterales order. This group presents a saline-related character and a chemoorganoheterotrophic and facultatively aerobic metabolism, although some species might oxidize H 2 . Given that Palauibacterales is potentially able to synthesize thiamine, whose auxotrophy is the second most common in the marine environment, we propose Palauibacterales as a key thiamine supplier to the marine communities. This finding suggests that Gemmatimonadota could have a more relevant role in the marine environment than previously thought.

Comparative Genomic Insights into the Evolution of Halobacteria -Associated “ Candidatus Nanohaloarchaeota”

Citation
Zhao et al. (2022). mSystems 7 (6)
Names (1)
Ca. Nanohaloarchaeota
Subjects
Biochemistry Computer Science Applications Ecology, Evolution, Behavior and Systematics Genetics Microbiology Modeling and Simulation Molecular Biology Physiology
Abstract
The DPANN superphylum is a group of archaea widely distributed in various habitats. They generally have small cells and have a symbiotic lifestyle with other archaea.

Naming the unnamed: over 65,000 Candidatus names for unnamed Archaea and Bacteria in the Genome Taxonomy Database

Citation
Pallen et al. (2022). International Journal of Systematic and Evolutionary Microbiology 72 (9)
Names (7)
“Paenistieleria cafavia” “Afabiota” “Afabiia” “Afabiales” “Afabiaceae” “Afabia” “Afabia udivosa”
Subjects
Ecology, Evolution, Behavior and Systematics General Medicine Microbiology Modeling and Simulation
Abstract
Thousands of new bacterial and archaeal species and higher-level taxa are discovered each year through the analysis of genomes and metagenomes. The Genome Taxonomy Database (GTDB) provides hierarchical sequence-based descriptions and classifications for new and as-yet-unnamed taxa. However, bacterial nomenclature, as currently configured, cannot keep up with the need for new well-formed names. Instead, microbiologists have been forced to use hard-to-remember alphanumeric placeholder labels. Here, we exploit an approach to the generation of well-formed arbitrary Latinate names at a scale sufficient to name tens of thousands of unnamed taxa within GTDB. These newly created names represent an important resource for the microbiology community, facilitating communication between bioinformaticians, microbiologists and taxonomists, while populating the emerging landscape of microbial taxonomic and functional discovery with accessible and memorable linguistic labels.

Reevaluation of the Phylogenetic Diversity and Global Distribution of the Genus “CandidatusAccumulibacter”

Citation
Petriglieri et al. (2022). mSystems 7 (3)
Names (1)
Ca. Accumulibacter
Subjects
Biochemistry Computer Science Applications Ecology, Evolution, Behavior and Systematics Genetics Microbiology Modeling and Simulation Molecular Biology Physiology
Abstract
“CandidatusAccumulibacter” is the most studied PAO, with a primary role in biological nutrient removal. However, the species-level taxonomy of this lineage is convoluted due to the use of different phylogenetic markers or genome sequencing approaches. Here, we redefined the phylogeny of these organisms, proposing a comprehensive approach which could be used to address the classification of other diverse and uncultivated lineages.

Deciphering Symbiotic Interactions of “ Candidatus Aenigmarchaeota” with Inferred Horizontal Gene Transfers and Co-occurrence Networks

Citation
Li et al. (2021). mSystems 6 (4)
Names (1)
Ca. Aenigmarchaeota
Subjects
Biochemistry Computer Science Applications Ecology, Evolution, Behavior and Systematics Genetics Microbiology Modeling and Simulation Modelling and Simulation Molecular Biology Physiology
Abstract
Recent advances in sequencing technology promoted the blowout discovery of super tiny microbes in the Diapherotrites , Parvarchaeota , Aenigmarchaeota , Nanoarchaeota , and Nanohaloarchaeota (DPANN) superphylum. However, the unculturable properties of the majority of microbes impeded our investigation of their behavior and symbiotic lifestyle in the corresponding community.

Comparative Genomics Reveals Thermal Adaptation and a High Metabolic Diversity in “ Candidatus Bathyarchaeia”

Citation
Qi et al. (2021). mSystems 6 (4)
Names (1)
Bathyarchaeia
Subjects
Biochemistry Computer Science Applications Ecology, Evolution, Behavior and Systematics Genetics Microbiology Modeling and Simulation Modelling and Simulation Molecular Biology Physiology
Abstract
Ca . Bathyarchaeia MAGs from terrestrial hot spring habitats are poorly revealed, though they have been studied extensively in marine ecosystems.

Increased Biosynthetic Gene Dosage in a Genome-Reduced Defensive Bacterial Symbiont

Citation
Lopera et al. (2017). mSystems 2 (6)
Names (2)
“Didemniditutus mandelae” “Didemniditutus”
Subjects
Biochemistry Computer Science Applications Ecology, Evolution, Behavior and Systematics Genetics Microbiology Modeling and Simulation Molecular Biology Physiology
Abstract
Secondary metabolites, which are small-molecule organic compounds produced by living organisms, provide or inspire drugs for many different diseases. These natural products have evolved over millions of years to provide a survival benefit to the producing organism and often display potent biological activity with important therapeutic applications. For instance, defensive compounds in the environment may be cytotoxic to eukaryotic cells, a property exploitable for cancer treatment. Here, we describe the genome of an uncultured symbiotic bacterium that makes such a cytotoxic metabolite. This symbiont is losing genes that do not endow a selective advantage in a hospitable host environment. Secondary metabolism genes, however, are repeated multiple times in the genome, directly demonstrating their selective advantage. This finding shows the strength of selective forces in symbiotic relationships and suggests that uncultured bacteria in such relationships should be targeted for drug discovery efforts.