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Thursday, August 27, 2020

Case Study: Diving Deep – Revealing the mysteries of marine life with SMRT Sequencing

Many scientists are using PacBio Single Molecule, Real-Time (SMRT) Sequencing to explore the genomes and transcriptomes of a wide variety of marine species and ecosystems. These studies are already adding to our understanding of how marine species adapt and evolve, contributing to conservation efforts, and informing how we can optimize food production through efficient aquaculture.

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Tuesday, April 21, 2020

Complete genome sequence of Antarcticibacterium flavum JB01H24T from an Antarctic marine sediment

Antarcticibacterium flavum JB01H24T was isolated from a marine sediment of the Ross Sea, Antarctica. Whole-genome sequencing of the strain Antarcticibacterium flavum JB01H24T was achieved using PacBio RS II platform. The resulting complete genome comprised of one closed, complete chromosome of 4,319,074 base pairs with a 40.87% G?+?C content, where genomic analyses demonstrated that it is constituted mostly by putative ORFs with unknown functions, representing a novel genetic feature. It is the first complete genome sequence of the Antarcticibacterium strain.

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Tuesday, April 21, 2020

Genome-Wide Association Study of Growth and Body-Shape-Related Traits in Large Yellow Croaker (Larimichthys crocea) Using ddRAD Sequencing.

Large yellow croaker (Larimichthys crocea) is an economically important marine fish species of China. Due to overfishing and marine pollution, the wild stocks of this croaker have collapsed in the past decades. Meanwhile, the cultured croaker is facing the difficulties of reduced genetic diversity and low growth rate. To explore the molecular markers related to the growth traits of croaker and providing the related SNPs for the marker-assisted selection, we used double-digest restriction-site associated DNA (ddRAD) sequencing to dissect the genetic bases of growth traits in a cultured population and identify the SNPs that associated with important growth traits by…

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Tuesday, April 21, 2020

Complete genome sequence of Marinobacter sp. LQ44, a haloalkaliphilic phenol-degrading bacterium isolated from a deep-sea hydrothermal vent

Marinobacter sp. strain LQ44, an alkaliphile and moderate halophile from a deep-sea hydrothermal vent on the East Pacific Rise, is a novel phenol-degrading bacterium that is capable of utilizing phenol as sole carbon and energy sources. Here, we present the complete genome sequence of strain LQ44, which consists of 4,435,564?bp with a circular chromosome, 4164 protein-coding genes, 3 rRNA operons and 50 tRNAs. Genome analysis revealed that strain LQ44 may degrade phenol via meta-cleavage pathway. The LQ44 genome contains multiple genes involved in pH adaptation and osmotic adjustment. Genes related to hydrocarbon degradation, aerobic denitrification and potential industrial important enzymes…

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Tuesday, April 21, 2020

The Genome of the Zebra Mussel, Dreissena polymorpha: A Resource for Invasive Species Research

The zebra mussel, Dreissena polymorpha, continues to spread from its native range in Eurasia to Europe and North America, causing billions of dollars in damage and dramatically altering invaded aquatic ecosystems. Despite these impacts, there are few genomic resources for Dreissena or related bivalves, with nearly 450 million years of divergence between zebra mussels and its closest sequenced relative. Although the D. polymorpha genome is highly repetitive, we have used a combination of long-read sequencing and Hi-C-based scaffolding to generate the highest quality molluscan assembly to date. Through comparative analysis and transcriptomics experiments we have gained insights into processes that…

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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 of a marine bacterium Vibrio chagasii ECSMB14107 with the ability to infect mussels

Vibrio strains are pervasive in the aquatic environment and may form pathogenic and symbiotic relationships with the host. Vibrio chagasii ECSMB14107 was isolated from natural biofilms and is used as a model to elucidate the role of Vibrio in hard-shelled mussel (Mytilus coruscus) settlement, health and disease. The genome of the Vibrio strain ECSMB14107, comprised of two circular chromosomes that together encompass 5,549,357?bp with a mean GC content of 44.39% was determined. Knowledge about the genome of V. chagasii ECSMB14107 will provide insight into its contribution to mussel development and health.

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Tuesday, April 21, 2020

Complete genome sequences of pooled genomic DNA from 10 marine bacteria using PacBio long-read sequencing.

High-quality, completed genomes are important to understand the functions of marine bacteria. PacBio sequencing technology provides a powerful way to obtain high-quality completed genomes. However individual library production is currently still costly, limiting the utility of the PacBio system for high-throughput genomics. Here we investigate how to generate high-quality genomes from pooled marine bacterial genomes.Pooled genomic DNA from 10 marine bacteria were subjected to a single library production and sequenced with eight SMRT cells on the PacBio RS II sequencing platform. In total, 7.35 Gbp of long-read data was generated, which is equivalent to an approximate 168× average coverage for…

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Tuesday, April 21, 2020

Complete genome of Pseudomonas sp. DMSP-1 isolated from the Arctic seawater of Kongsfjorden, Svalbard

The genus Pseudomonas is highly metabolically diverse and has colonized a wide range of ecological niches. The strain Pseudomonas sp. DMSP-1 was isolated from Arctic seawater (Kongsfjorden, Svalbard) using dimethylsulfoniopropionate (DMSP) as the sole carbon source. To better understand its role in the Arctic coastal ecosystem, the genome of Pseudomonas sp. strain DMSP-1 was completely sequenced. The genome contained a circular chromosome of 6,282,445?bp with an average GC content of 60.01?mol%. A total of 5510 protein coding genes, 70 tRNA genes and 19 rRNA genes were obtained. However, no genes encoding known enzymes associated with DMSP catabolism were identified in…

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Tuesday, April 21, 2020

Genomic data mining of an Antarctic deep-sea actinobacterium, Janibacter limosus P3-3-X1

Janibacter limosus P3-3-X1, a psychrotolerant deep-sea actinobacterium isolated from the Southern Ocean, was completely sequenced and analyzed for its biotechnological potential in bioremediation and natural product biosynthesis. The circular genome contained 3.5?Mb with a high GC content of 70.44?mol%. Genomic data mining revealed a gene cluster for degrading phenol and its derivatives, including a multi-component phenol hydroxylase and a meta-cleavage pathway. The strain was shown to grow on phenol as its sole carbon source, supporting the findings of genomic analysis. Many more genes encoding for monooxygenases, dioxygenases and other aromatic compound degradation proteins involved in xenobiotics degradation were detected. Multiple…

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Tuesday, April 21, 2020

Complete genome sequence of Pseudoalteromonas sp. MEBiC 03485, isolated from deep-sea sediment

Pseudoalteromonas strains are widely distributed in the marine environment and most have attracted considerable interest owing to their ability to synthesize biologically active metabolites. In this study, we report and describe the genome sequence of Pseudoalteromonas sp. MEBiC 03485, isolated from the deep-sea sediment of Pacific Ocean at a depth of 2000?m. The complete genome consisted of three contigs with a total genome size of 4,167,407?bp and a GC content of 40.76?l%, and was predicted to contain 4194 protein-coding genes and 131 non-coding RNA genes. The strain MEBiC 03485 genome was also shown to contain genes for diverse metabolic pathways.…

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Tuesday, April 21, 2020

A microbial factory for defensive kahalalides in a tripartite marine symbiosis.

Chemical defense against predators is widespread in natural ecosystems. Occasionally, taxonomically distant organisms share the same defense chemical. Here, we describe an unusual tripartite marine symbiosis, in which an intracellular bacterial symbiont (“Candidatus Endobryopsis kahalalidefaciens”) uses a diverse array of biosynthetic enzymes to convert simple substrates into a library of complex molecules (the kahalalides) for chemical defense of the host, the alga Bryopsis sp., against predation. The kahalalides are subsequently hijacked by a third partner, the herbivorous mollusk Elysia rufescens, and employed similarly for defense. “Ca E. kahalalidefaciens” has lost many essential traits for free living and acts as a…

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Tuesday, April 21, 2020

Draft Genome Sequences of Type VI Secretion System-Encoding Vibrio fischeri Strains FQ-A001 and ES401.

The type VI secretion system (T6SS) facilitates lethal competition between bacteria through direct contact. Comparative genomics has facilitated the study of these systems in Vibrio fischeri, which colonizes the squid host Euprymna scolopes Here, we report the draft genome sequences of two lethal V. fischeri strains that encode the T6SS, FQ-A001 and ES401.Copyright © 2019 Bultman et al.

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Tuesday, April 21, 2020

Chromosomal-level assembly of the blolsod clam, Scapharca (Anadara) broughtonii, using long sequence reads and Hi-C.

The blood clam, Scapharca (Anadara) broughtonii, is an economically and ecologically important marine bivalve of the family Arcidae. Efforts to study their population genetics, breeding, cultivation, and stock enrichment have been somewhat hindered by the lack of a reference genome. Herein, we report the complete genome sequence of S. broughtonii, a first reference genome of the family Arcidae.A total of 75.79 Gb clean data were generated with the Pacific Biosciences and Oxford Nanopore platforms, which represented approximately 86× coverage of the S. broughtonii genome. De novo assembly of these long reads resulted in an 884.5-Mb genome, with a contig N50…

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Tuesday, April 21, 2020

A hybrid de novo assembly of the sea pansy (Renilla muelleri) genome.

More than 3,000 species of octocorals (Cnidaria, Anthozoa) inhabit an expansive range of environments, from shallow tropical seas to the deep-ocean floor. They are important foundation species that create coral “forests,” which provide unique niches and 3-dimensional living space for other organisms. The octocoral genus Renilla inhabits sandy, continental shelves in the subtropical and tropical Atlantic and eastern Pacific Oceans. Renilla is especially interesting because it produces secondary metabolites for defense, exhibits bioluminescence, and produces a luciferase that is widely used in dual-reporter assays in molecular biology. Although several anthozoan genomes are currently available, the majority of these are hexacorals.…

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