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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

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 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 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

Strengths and potential pitfalls of hay-transfer for ecological restoration revealed by RAD-seq analysis in floodplain Arabis species

Achieving high intraspecific genetic diversity is a critical goal in ecological restoration as it increases the adaptive potential and long-term resilience of populations. Thus, we investigated genetic diversity within and between pristine sites in a fossil floodplain and compared it to sites restored by hay-transfer between 1997 and 2014. RAD-seq genotyping revealed that the stenoecious flood-plain species Arabis nemorensis is co-occurring with individuals that, based on ploidy, ITS-sequencing and morphology, probably belong to the close relative Arabis sagittata, which has a documented preference for dry calcareous grasslands but has not been reported in floodplain meadows. We show that hay-transfer maintains…

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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 38 Serratia marcescens Isolates Associated with Acroporid Serratiosis.

Serratia marcescens is a Gram-negative bacterium causally linked to acroporid serratiosis, a form of white pox disease implicated in the decline of elkhorn corals. We report draft genomes of 38 S. marcescens isolates collected from host and nonhost sources. The availability of these genomes will aid future analyses of acroporid serratiosis. Copyright © 2019 Elledge 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

De novo assembly of the goldfish (Carassius auratus) genome and the evolution of genes after whole-genome duplication.

For over a thousand years, the common goldfish (Carassius auratus) was raised throughout Asia for food and as an ornamental pet. As a very close relative of the common carp (Cyprinus carpio), goldfish share the recent genome duplication that occurred approximately 14 million years ago in their common ancestor. The combination of centuries of breeding and a wide array of interesting body morphologies provides an exciting opportunity to link genotype to phenotype and to understand the dynamics of genome evolution and speciation. We generated a high-quality draft sequence and gene annotations of a “Wakin” goldfish using 71X PacBio long reads.…

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Tuesday, April 21, 2020

Sensory receptor repertoire in cyprid antennules of the barnacle Balanus improvisus.

Barnacle settlement involves sensing of a variety of exogenous cues. A pair of antennules is the main sensory organ that the cyprid larva uses to explore the surface. Antennules are equipped with a number of setae that have both chemo- and mechanosensing function. The current study explores the repertoire of sensory receptors in Balanus improvisus cyprid antennules with the goal to better understand sensory systems involved in the settling behavior of this species. We carried out transcriptome sequencing of dissected B. improvisus cyprid antennules. The generated transcriptome assembly was used to search for sensory receptors using HMM models. Among potential…

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Tuesday, April 21, 2020

Morphotypes of the common beadlet anemone Actinia equina (L.) are genetically distinct

Anemones of the genus Actinia are ecologically important and familiar organisms on many rocky shores. However, this genus is taxonomically problematical and prior evidence suggests that the North Atlantic beadlet anemone, Actinia equina, may actually consist of a number of cryptic species. Previous genetic work has been largely limited to allozyme electrophoresis and there remains a dearth of genetic resources with which to study this genus. Mitochondrial DNA sequencing may help to clarify the taxonomy of Actinia. Here, the complete mitochondrial genome of the beadlet anemone Actinia equina (Cnidaria: Anthozoa: Actinaria: Actiniidae) is shown to be 20,690?bp in length and…

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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

Finding Nemo’s Genes: A chromosome-scale reference assembly of the genome of the orange clownfish Amphiprion percula.

The iconic orange clownfish, Amphiprion percula, is a model organism for studying the ecology and evolution of reef fishes, including patterns of population connectivity, sex change, social organization, habitat selection and adaptation to climate change. Notably, the orange clownfish is the only reef fish for which a complete larval dispersal kernel has been established and was the first fish species for which it was demonstrated that antipredator responses of reef fishes could be impaired by ocean acidification. Despite its importance, molecular resources for this species remain scarce and until now it lacked a reference genome assembly. Here, we present a…

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Tuesday, April 21, 2020

The rising tide of high-quality genomic resources.

Few images are more iconic of coral reef ecosystems than an orange clownfish (Amphiprion percula) nestled among the tentacles of its mutualistic partner, the sea anemone (Figure 1a). Popularized as the Disney character, “Nemo,” clownfish are more than a charismatic on- screen presence. Among biologists, they are an ecological and evolutionary research model, shedding light on everything from social organization (Wong, Uppaluri, Medina, Seymour, & Buston, 2016) to mutualisms (Schmiege, D’Aloia, & Buston, 2017). Now, clownfish have yet another reason to be in the spotlight.

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