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Tuesday, April 21, 2020

Complete genome sequence of Paracoccus sp. Arc7-R13, a silver nanoparticles synthesizing bacterium isolated from Arctic Ocean sediments

Paracoccus sp. Arc7-R13, a silver nanoparticles (AgNPs) synthesizing bacterium, was isolated from Arctic Ocean sediment. Here we describe the complete genome of Paracoccus sp. Arc7-R13. The complete genome contains 4,040,012?bp with 66.66?mol%?G?+?C content, including one circular chromosome of 3,231,929?bp (67.45?mol%?G?+?C content), and eight plasmids with length ranging from 24,536?bp to 199,685?bp. The genome contains 3835 protein-coding genes (CDSs), 49 tRNA genes, as well as 3 rRNA operons as 16S-23S-5S rRNA. Based on the gene annotation and Swiss-Prot analysis, a total of 15 genes belonging to 11 kinds, including silver exporting P-type ATPase (SilP), alkaline phosphatase, nitroreductase, thioredoxin reductase, NADPH dehydrogenase…

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Tuesday, April 21, 2020

Complete genome sequence of Paenisporosarcina antarctica CGMCC 1.6503 T, a marine psychrophilic bacterium isolated from Antarctica

A marine psychrophilic bacterium _Paenisporosarcina antarctica_ CGMCC 1.6503T (= JCM 14646T) was isolated off King George Island, Antarctica (62°13’31? S 58°57’08? W). In this study, we report the complete genome sequence of _Paenisporosarcina antarctica_, which is comprised of 3,972,524?bp with a mean G?+?C content of 37.0%. By gene function and metabolic pathway analyses, studies showed that strain CGMCC 1.6503T encodes a series of genes related to cold adaptation, including encoding fatty acid desaturases, dioxygenases, antifreeze proteins and cold shock proteins, and possesses several two-component regulatory systems, which could assist this strain in responding to the cold stress, the oxygen stress…

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Tuesday, April 21, 2020

Transcriptome Analysis Reveals the Accumulation Mechanism of Anthocyanins in Buckwheat (Fagopyrum esculentum Moench) Cotyledons and Flowers.

Buckwheat (Fagopyrum esculentum) is a valuable crop which can produce multiple human beneficial secondary metabolites, for example, the anthocyanins in sprouts and flowers. However, as the predominant group of visible polyphenols in pigmentation, little is known about the molecular mechanisms underlying the anthocyanin biosynthesis within buckwheat. In this study, a comparative transcriptome analysis of green and red common buckwheat cultivars was carried out through RNA sequencing. Overall, 3727 and 5323 differently expressed genes (DEGs) were identified in flowers and cotyledons, respectively. Through GO and KEGG analysis, we revealed that DEGs in flowers and cotyledons are predominately involved in biosynthesis of…

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Tuesday, April 21, 2020

Chromosome-scale assemblies reveal the structural evolution of African cichlid genomes.

African cichlid fishes are well known for their rapid radiations and are a model system for studying evolutionary processes. Here we compare multiple, high-quality, chromosome-scale genome assemblies to elucidate the genetic mechanisms underlying cichlid diversification and study how genome structure evolves in rapidly radiating lineages.We re-anchored our recent assembly of the Nile tilapia (Oreochromis niloticus) genome using a new high-density genetic map. We also developed a new de novo genome assembly of the Lake Malawi cichlid, Metriaclima zebra, using high-coverage Pacific Biosciences sequencing, and anchored contigs to linkage groups (LGs) using 4 different genetic maps. These new anchored assemblies allow…

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Tuesday, April 21, 2020

Divergent evolution in the genomes of closely related lacertids, Lacerta viridis and L. bilineata, and implications for speciation.

Lacerta viridis and Lacerta bilineata are sister species of European green lizards (eastern and western clades, respectively) that, until recently, were grouped together as the L. viridis complex. Genetic incompatibilities were observed between lacertid populations through crossing experiments, which led to the delineation of two separate species within the L. viridis complex. The population history of these sister species and processes driving divergence are unknown. We constructed the first high-quality de novo genome assemblies for both L. viridis and L. bilineata through Illumina and PacBio sequencing, with annotation support provided from transcriptome sequencing of several tissues. To estimate gene flow…

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Tuesday, April 21, 2020

Aquella oligotrophica gen. nov. sp. nov.: A new member of the family Neisseriaceae isolated from laboratory tap water.

A bacterial strain designated as P08T was isolated from laboratory tap water during a water quality assessment in University of Malaya, Malaysia. The strain was a Gram-negative, rod-shaped, nonmotile, and aerobic bacterium. Complete genome of P08T comprised of a 2,820,660 bp chromosome with a G + C content of 36.43%. Both 16S rRNA phylogeny and phylogenetic tree inferred from the core gene matrix demonstrated that P08T formed a hitherto unknown subline within the family Neisseriaceae. Ortho average nucleotide identity (OrthoANI) values and the percentage of conserved proteins (POCP) calculated from complete genome sequence indicated low relatedness between P08T and its phylogenetic neighbors. Respiratory…

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Tuesday, April 21, 2020

Genome mining identifies cepacin as a plant-protective metabolite of the biopesticidal bacterium Burkholderia ambifaria.

Beneficial microorganisms are widely used in agriculture for control of plant pathogens, but a lack of efficacy and safety information has limited the exploitation of multiple promising biopesticides. We applied phylogeny-led genome mining, metabolite analyses and biological control assays to define the efficacy of Burkholderia ambifaria, a naturally beneficial bacterium with proven biocontrol properties but potential pathogenic risk. A panel of 64 B.?ambifaria strains demonstrated significant antimicrobial activity against priority plant pathogens. Genome sequencing, specialized metabolite biosynthetic gene cluster mining and metabolite analysis revealed an armoury of known and unknown pathways within B.?ambifaria. The biosynthetic gene cluster responsible for the…

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Tuesday, April 21, 2020

Inter-chromosomal coupling between vision and pigmentation genes during genomic divergence.

Recombination between loci underlying mate choice and ecological traits is a major evolutionary force acting against speciation with gene flow. The evolution of linkage disequilibrium between such loci is therefore a fundamental step in the origin of species. Here, we show that this process can take place in the absence of physical linkage in hamlets-a group of closely related reef fishes from the wider Caribbean that differ essentially in colour pattern and are reproductively isolated through strong visually-based assortative mating. Using full-genome analysis, we identify four narrow genomic intervals that are consistently differentiated among sympatric species in a backdrop of…

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Tuesday, April 21, 2020

Complete genome sequences of a H2O2-resistant psychrophilic bacterium Colwellia sp. Arc7-D isolated from Arctic Ocean sediment

Colwellia sp. Arc7-D, a psychrophilic H2O2-resisitant bacterium, was isolated from Arctic Ocean sediment. Here we describe the complete genome of Colwellia sp. Arc7-D. The genome has one circular chromosome of 4,305,442?bp (37.67?mol%?G?+?C content), consisting of 3526 coding genes, 77 tRNA genes, as well as five rRNA operons as 16S–23S-5S rRNA and one rRNA operon as 16S-23S-5S-5S. According to KEGG analysis, strain Arc7-D encodes 23 genes related with antioxidant activity including superoxide dismutase, glutathione peroxidase, glutathione reductase and catalase. However, many additional genes affiliated with anti-oxidative stress were also identified, such as aconitase, thioredoxin and ascorbic acid.

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Tuesday, April 21, 2020

Complete genome sequence of Streptomyces spongiicola HNM0071T, a marine sponge-associated actinomycete producing staurosporine and echinomycin

Streptomyes spongiicola HNM0071T is a novel marine sponge-associated actinomycete with potential to produce antitumor agents including staurosporine and echinomycin. Here, we present the complete genome sequence of S. spongiicola HNM0071, which consists of a linear chromosome of 7,180,417?bp, 5669 protein coding genes, 18 rRNA genes, and 66 tRNA genes. Twenty-seven putative secondary metabolite biosynthetic gene clusters were found in the genome. Among them, the staurosporine and echinomycin gene clusters have been described completely. The complete genome information presented here will enable us to investigate the biosynthetic mechanism of two well-known antitumor antibiotics and to discover novel secondary metabolites with potential…

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Tuesday, April 21, 2020

Complete genome of Pseudoalteromonas atlantica ECSMB14104, a Gammaproteobacterium inducing mussel settlement

Pseudoalteromonas is widely distributed in the marine environments and the biofilms formed by Pseudoalteromonas promote settlement of many species of invertebrates. Here, we show the complete genome of Pseudoalteromonas atlantica ECSMB14104, which was isolated from biofilms formed in the East China Sea and exhibited inducing activity on the Mytilus coruscus settlement. Complete genome of this strain containsa total of 3325 genes and the GC content of 41.02%. This genomic information is contributed to molecular mechanism of P. atlantica ECSMB14104 regulating mussel settlement.

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Tuesday, April 21, 2020

Complete genome sequence of the novel agarolytic Catenovulum-like strain CCB-QB4

Members of the genus Catenovulum are recognized for their ability to degrade algal biomass. Here we report the complete genome of Cantenovulum–like strain CCB-QB4, an agarolytic bacterium isolated from the coastal area of Penang, Malaysia. The sequenced genome is composed of a 5,663,044?bp circular chromosome and a 208,085?bp circular plasmid. It contained 4409 protein coding and 83 RNA genes, including 62 tRNAs and 21 rRNAs. The genome of CCB-QB4 contains many agarases, which correlate with the high capacity of the strain to degrade agar. Genome sequencing of CCB-QB4 reveals gene candidates of potential interest in enzymatic industries or applications in…

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Tuesday, April 21, 2020

Snf2 controls pulcherriminic acid biosynthesis and antifungal activity of the biocontrol yeast Metschnikowia pulcherrima.

Metschnikowia pulcherrima synthesises the pigment pulcherrimin, from cyclodileucine (cyclo(Leu-Leu)) as a precursor, and exhibits strong antifungal activity against notorious plant pathogenic fungi. This yeast therefore has great potential for biocontrol applications against fungal diseases; particularly in the phyllosphere where this species is frequently found. To elucidate the molecular basis of the antifungal activity of M. pulcherrima, we compared a wild-type strain with a spontaneously occurring, pigmentless, weakly antagonistic mutant derivative. Whole genome sequencing of the wild-type and mutant strains identified a point mutation that creates a premature stop codon in the transcriptional regulator gene SNF2 in the mutant. Complementation of…

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Tuesday, April 21, 2020

Full-length transcriptome sequences obtained by a combination of sequencing platforms applied to heat shock proteins and polyunsaturated fatty acids biosynthesis in Pyropia haitanensis

Pyropia haitanensis is a high-yield commercial seaweed in China. Pyropia haitanensis farms often suffer from problems such as severe germplasm degeneration, while the mechanisms underlying resistance to abiotic stresses remain unknown because of lacking genomic information. Although many previous studies focused on using next-generation sequencing (NGS) technologies, the short-read sequences generated by NGS generally prevent the assembly of full-length transcripts, and then limit screening functional genes. In the present study, which was based on hybrid sequencing (NGS and single-molecular real-time sequencing) of the P. haitanensis thallus transcriptome, we obtained high-quality full-length transcripts with a mean length of 2998 bp and…

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Tuesday, April 21, 2020

Wild relatives of maize

Crop domestication changed the course of human evolution, and domestication of maize (Zea mays L. subspecies mays), today the world’s most important crop, enabled civilizations to flourish and has played a major role in shaping the world we know today. Archaeological and ethnobotanical research help us understand the development of the cultures and the movements of the peoples who carried maize to new areas where it continued to adapt. Ancient remains of maize cobs and kernels have been found in the place of domestication, the Balsas River Valley (~9,000 years before present era), and the cultivation center, the Tehuacan Valley…

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