Benchmarking short-, long- and hybrid-read assemblers for metagenome sequencing of complex microbial communities.

Metagenome community analyses, driven by the continued development in sequencing technology, is rapidly providing insights in many aspects of microbiology and becoming a cornerstone tool. Illumina, Oxford Nanopore Technologies (ONT) and Pacific Biosciences (PacBio) are the leading technologies, each with their own advantages and drawbacks. Illumina provides accurate reads at a low cost, but their length is too short to close bacterial genomes.

A comparative genomic analysis of Fructobacillus evanidus sp. nov. from bumble bees.

The increase in studies on bee microbiomes is prompted by concerns over global pollinator declines. Bumble bees host core and non-core microbiota which may contribute to increased lifetime fitness. The presence of Fructobacillus in the gut microbiomes of bumble bee workers, or the replacement of core symbionts with Fructobacillus bacteria, has been considered a marker of dysbiosis.

Brytella acorum gen. nov., sp. nov., a novel acetic acid bacterium from sour beverages.

Polyphasic taxonomic and comparative genomic analyses revealed that a series of lambic beer isolates including strain LMG 32668 and the kombucha isolate LMG 32879 represent a novel species among the acetic acid bacteria, with Acidomonas methanolica as the nearest phylogenomic neighbor with a valid name. Overall genomic relatedness indices and phylogenomic and physiological analyses revealed that this novel species was best classified in a novel genus for which we propose the name Brytella acorum gen. nov.

Genome Sequences of the Two Type Strains, Telluria chitinolytica ACM 3522 and Telluria mixta DSM 29330.

High-quality draft genome sequences were obtained for the two type strains Telluria chitinolytica ACM 3522 and Telluria mixta DSM 29330. The genomes of both strains show a considerable biosynthetic potential to produce secondary metabolites.

The GEN-ERA toolbox: unified and reproducible workflows for research in microbial genomics.

Background: Microbial culture collections play a key role in taxonomy by studying the diversity of their strains and providing well-characterized biological material to the scientific community for fundamental and applied research. These microbial resource centers thus need to implement new standards in species delineation, including whole-genome sequencing and phylogenomics. In this context, the genomic needs of the Belgian Coordinated Collections of Microorganisms were studied, resulting in the GEN-ERA toolbox.

Phylogenomic Analyses of Isolates from Honeybees and Bumblebees Reveal Taxonomic and Functional Diversity.

is a genus of that lives in the gut of honeybees ( spp.) and bumblebees ( spp). It is part of a conserved microbiome that is composed of a few core phylotypes and is essential for bee health and metabolism.

Accurate prediction of metagenome-assembled genome completeness by MAGISTA, a random forest model built on alignment-free intra-bin statistics.

Background: Although the total number of microbial taxa on Earth is under debate, it is clear that only a small fraction of these has been cultivated and validly named. Evidently, the inability to culture most bacteria outside of very specific conditions severely limits their characterization and further studies. In the last decade, a major part of the solution to this problem has been the use of metagenome sequencing, whereby the DNA of an entire microbial community is sequenced, followed by the in silico reconstruction of genomes of its novel component species.

Consistent Prebiotic Effects of Carrot RG-I on the Gut Microbiota of Four Human Adult Donors in the SHIME Model despite Baseline Individual Variability.

The human gut microbiome is currently recognized to play a vital role in human biology and development, with diet as a major modulator. Therefore, novel indigestible polysaccharides that confer a health benefit upon their fermentation by the microbiome are under investigation. Based on the recently demonstrated prebiotic potential of a carrot-derived pectin extract enriched for rhamnogalacturonan I (cRG-I), the current study aimed to assess the impact of cRG-I upon repeated administration using the M-SHIME technology (3 weeks at 3g cRG-I/d).

Characterization of novel species from fruits and fermented food products sp. nov. sp. nov. and sp. nov.

Strains LMG 1744, LMG 1745, LMG 31484, LMG 1764 and R-71646 were isolated from rotting fruits and fermented food products. A phylogenomic analysis based on 107 single-copy core genes revealed that they grouped in a lineage comprising , , , and . OrthoANIu and digital DNA hybridization analyses demonstrated that these five strains represented three novel species, which could be differentiated from the type strains of closely related species by multiple phenotypic characteristics.

gen. nov., sp. nov., a new member of the isolated from the gut of the cockroach .

A novel bacterium designated G55GP and pertaining to the family was isolated from the gut of the Madagascar hissing cockroach . The Gram-negative cells were rod-shaped and non-motile. The complete 16S rRNA sequence of the strain G55GP showed the highest pairwise similarity to CFN-Cf-55T (95.

sp. nov., a novel species from sugar-rich environments.

A phylogenomic analysis based on 107 single-copy core genes revealed that three strains from sugar-rich environments, i.e. LMG 1728, LMG 1731 and LMG 22058, represented a single, novel lineage with as nearest validly named neighbour.

Novel acetic acid bacteria from cider fermentations: sp. nov. and sp. nov.

Strains LMG 1627, LMG 1636 and LMG 1637 were all isolated from cider fermentations in the 1940s and 1950s. A recent study based on MALDI-TOF MS and gene sequence analyses suggested they represented novel species. In the present study, we determined the whole-genome sequences of these strains and analysed their phenotypic and chemotaxonomic characteristics.

Description of sp. nov. and sp. nov. Isolated from Apple Cider Vinegar.

Two novel strains AV382 and AV436 were isolated from a submerged industrial bioreactor for production of apple cider vinegar in Kopivnik (Slovenia). Both strains showed very high (≥98.2%) 16S rRNA gene sequence similarities with species, but lower 16S-23S rRNA gene internal transcribed spacer (ITS).

sp. nov., having a SPI-1-like Type III secretion system and low virulence.

strains isolated from potato stems in Finland, Poland and the Netherlands were subjected to polyphasic analyses to characterize their genomic and phenotypic features. Phylogenetic analysis based on 382 core proteins showed that the isolates clustered closest to but could be divided into two clades. Average nucleotide identity (ANI) analysis revealed that the isolates in one of the clades included the type strain, whereas the second clade was at the border of the species with a 96 % ANI value.

PaSiT: a novel approach based on short-oligonucleotide frequencies for efficient bacterial identification and typing.

Motivation: One of the most widespread methods used in taxonomy studies to distinguish between strains or taxa is the calculation of average nucleotide identity. It requires a computationally expensive alignment step and is therefore not suitable for large-scale comparisons. Short oligonucleotide-based methods do offer a faster alternative but at the expense of accuracy.

Introducing SPeDE: High-Throughput Dereplication and Accurate Determination of Microbial Diversity from Matrix-Assisted Laser Desorption-Ionization Time of Flight Mass Spectrometry Data.

The isolation of microorganisms from microbial community samples often yields a large number of conspecific isolates. Increasing the diversity covered by an isolate collection entails the implementation of methods and protocols to minimize the number of redundant isolates. Matrix-assisted laser desorption-ionization time-of-flight (MALDI-TOF) mass spectrometry methods are ideally suited to this dereplication problem because of their low cost and high throughput.

sp. nov., producer of semduramicin, a polyether ionophore.

The taxonomic position of '' LMG 30035, a semduramicin-producing mutant of strain ATCC 53666, which was isolated from a soil sample collected in Yamae Village, Kamamoto, Japan, was clarified in the present study using a polyphasic approach. This Gram-positive, aerobic actinomycete formed a well-developed, extensively branched, non-fragmenting substrate and aerial mycelia which differentiated into single, smooth-appearing spores. Based on analysis of nearly complete 16S rRNA gene sequence, strain LMG 30035 was found to be closely related to the type strains of ATCC 49459 (98.

Genome sequences and description of novel exopolysaccharides producing species Komagataeibacter pomaceti sp. nov. and reclassification of Komagataeibacter kombuchae (Dutta and Gachhui 2007) Yamada et al., 2013 as a later heterotypic synonym of Komagataeibacter hansenii (Gosselé et al. 1983) Yamada et al., 2013.

Strains T5K1 and AV446 isolated from apple cider vinegars during a submerged vinegar production in two separate vinegar facilities showed 94% 16S rRNA gene similarity to its closest neighbors Komagataeibacter maltaceti LMG 1529 and Gluconacetobacter entanii LTH 4560. Further phylogenetic and phenotypic characterizations indicated that the isolates belonged to a novel species of the Komagataeibacter genus. Comparison based on 16S-23S rRNA gene ITS sequences and concatenated partial sequences of the housekeeping genes dnaK, groEL and rpoB, grouped both strains to a single phylogenetic cluster well separated from the other species of the Komagataeibacter genus.

Arcobacter haliotis sp. nov., isolated from abalone species Haliotis gigantea.

A Gram-negative, aerobic, polar-flagellated and rod-shaped, sometimes slightly curved bacterium, designated MA5T, was isolated from the gut of an abalone of the species Haliotis gigantea collected in Japan. Phylogenetic analyses based on 16S rRNA, gyrB, hsp60 and rpoB gene sequences placed strain MA5T in the genus Arcobacter in an independent phylogenetic line. Comparison of the 16S rRNA gene sequence of this strain with those of the type strains of the established Arcobacter species revealed A.

Paenibacillus aquistagni sp. nov., isolated from an artificial lake accumulating industrial wastewater.

Strain 11 was isolated from water of an artificial lake accumulating industrial wastewater on the outskirts of Celje, Slovenia. Phenotypic characterisation showed strain 11 to be a Gram-stain positive, spore forming bacterium. The 16S rRNA gene sequence identified strain 11 as a member of the genus Paenibacillus, closely related to Paenibacillus alvei (96.

Identification of acetic acid bacteria through matrix-assisted laser desorption/ionization time-of-flight mass spectrometry and report of Gluconobacter nephelii Kommanee et al. 2011 and Gluconobacter uchimurae Tanasupawat et al. 2012 as later heterotypic synonyms of Gluconobacter japonicus Malimas et al. 2009 and Gluconobacter oxydans (Henneberg 1897) De Ley 1961 (Approved Lists 1980) emend. Gosselé et al. 1983, respectively.

The classification and identification of acetic acid bacteria (AAB) underwent much change during the last two decades. However, several closely related AAB species are difficult to differentiate and rapid and correct species level identification remains challenging. In the present study, 281 well-characterized AAB strains representing AAB species of the family Acetobacteraceae were used to construct a matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS) identification database.

Cellulose synthesis by Komagataeibacter rhaeticus strain P 1463 isolated from Kombucha.

Isolate B17 from Kombucha was estimated to be an efficient producer of bacterial cellulose (BC). The isolate was deposited under the number P 1463 and identified as Komagataeibacter rhaeticus by comparing a generated amplified fragment length polymorphism (AFLP™) DNA fingerprint against a reference database. Static cultivation of the K.