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Friday, July 19, 2019

Advantages of Single-Molecule Real-Time Sequencing in high-GC content genomes.

Next-generation sequencing has become the most widely used sequencing technology in genomics research, but it has inherent drawbacks when dealing with high-GC content genomes. Recently, single-molecule real-time sequencing technology (SMRT) was introduced as a third-generation sequencing strategy to compensate for this drawback. Here, we report that the unbiased and longer read length of SMRT sequencing markedly improved genome assembly with high GC content via gap filling and repeat resolution.

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Friday, July 19, 2019

Chromosomal-level assembly of the Asian seabass genome using long sequence reads and multi-layered scaffolding.

We report here the ~670 Mb genome assembly of the Asian seabass (Lates calcarifer), a tropical marine teleost. We used long-read sequencing augmented by transcriptomics, optical and genetic mapping along with shared synteny from closely related fish species to derive a chromosome-level assembly with a contig N50 size over 1 Mb and scaffold N50 size over 25 Mb that span ~90% of the genome. The population structure of L. calcarifer species complex was analyzed by re-sequencing 61 individuals representing various regions across the species’ native range. SNP analyses identified high levels of genetic diversity and confirmed earlier indications of a…

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Friday, July 19, 2019

The genome of Chenopodium quinoa.

Chenopodium quinoa (quinoa) is a highly nutritious grain identified as an important crop to improve world food security. Unfortunately, few resources are available to facilitate its genetic improvement. Here we report the assembly of a high-quality, chromosome-scale reference genome sequence for quinoa, which was produced using single-molecule real-time sequencing in combination with optical, chromosome-contact and genetic maps. We also report the sequencing of two diploids from the ancestral gene pools of quinoa, which enables the identification of sub-genomes in quinoa, and reduced-coverage genome sequences for 22 other samples of the allotetraploid goosefoot complex. The genome sequence facilitated the identification of…

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Friday, July 19, 2019

Dissecting the causal mechanism of X-linked Dystonia-Parkinsonism by integrating genome and transcriptome assembly.

X-linked Dystonia-Parkinsonism (XDP) is a Mendelian neurodegenerative disease that is endemic to the Philippines and is associated with a founder haplotype. We integrated multiple genome and transcriptome assembly technologies to narrow the causal mutation to the TAF1 locus, which included a SINE-VNTR-Alu (SVA) retrotransposition into intron 32 of the gene. Transcriptome analyses identified decreased expression of the canonical cTAF1 transcript among XDP probands, and de novo assembly across multiple pluripotent stem-cell-derived neuronal lineages discovered aberrant TAF1 transcription that involved alternative splicing and intron retention (IR) in proximity to the SVA that was anti-correlated with overall TAF1 expression. CRISPR/Cas9 excision of the SVA…

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Sunday, July 7, 2019

Complete genome sequence of the bioluminescent marine bacterium Vibrio harveyi ATCC 33843 (392 [MAV]).

Vibrio harveyi is a Gram-negative marine ?-proteobacterium that is known to be a formidable pathogen of aquatic animals and is a model organism for the study of bacterial bioluminescence and quorum sensing. In this report, we describe the complete genome sequence of the most studied strain of this species: V. harveyi ATCC 33843 (392 [MAV]). Copyright © 2015 Wang et al.

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Sunday, July 7, 2019

Complete genome sequence of Marinobacter sp. CP1, isolated from a self-regenerating biocathode biofilm.

Marinobacter sp. CP1 was isolated from a self-regenerating and self-sustaining biocathode biofilm that can fix CO2 and generate electric current. We present the complete genome sequence of this strain, which consists of a circular 4.8-Mbp chromosome, to understand the mechanism of extracellular electron transfer in a microbial consortium. Copyright © 2015 Wang et al.

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Sunday, July 7, 2019

Complete genome sequence of the probiotic bacterium Bifidobacterium breve KCTC 12201BP isolated from a healthy infant.

We present the completely sequenced genome of Bifidobacterium breve CBT BR3, which was isolated from the feces of a healthy infant. The 2.43-Mb genome contains several kinds of genetic factors associated with health promotion of the human host such as oligosaccharide-degrading genes and vitamin-biosynthetic genes. Copyright © 2015. Published by Elsevier B.V.

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Sunday, July 7, 2019

Complete genome sequence of Bifidobacterium longum KCTC 12200BP, a probiotic strain promoting the intestinal health.

Bifidobacteria constitute a major group of beneficial intestinal bacteria, and are therefore often used to formulate probiotic products in combination with lactic acid bacteria. The availability of bifidobacterial genome sequences has broadened our knowledge on health-promoting factors as well as their safety assessments. Here, we present the complete genome sequence of Bifidobacterium longum CBT BG7 that consists of a 2.45-Mb chromosome and a plasmid. Copyright © 2015. Published by Elsevier B.V.

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Sunday, July 7, 2019

A full genomic characterization of the development of a stable Small Colony Variant cell-type by a clinical Staphylococcus aureus strain.

A key to persistent and recurrent Staphylococcus aureus infections is its ability to adapt to diverse and toxic conditions. This ability includes a switch into a biofilm or to the quasi-dormant Small Colony Variant (SCV). The development and molecular attributes of SCVs have been difficult to study due to their rapid reversion to their parental cell-type. We recently described the unique induction of a matrix-embedded and stable SCV cell-type in a clinical S. aureus strain (WCH-SK2) by growing the cells with limiting conditions for a prolonged timeframe. Here we further study their characteristics. They possessed an increased viability in the…

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Sunday, July 7, 2019

Genome sequence of Salmonella enterica subsp. enterica serovar Typhi isolate PM016/13 from untreated well water associated with a Typhoid outbreak in Pasir Mas, Kelantan, Malaysia.

Salmonella enterica subsp. enterica serovar Typhi is a human-restricted pathogen that causes typhoid fever. Even though it is a human-restricted pathogen, the bacterium is also isolated from environments such as groundwater and pond water. Here, we describe the genome sequence of the Salmonella enterica subsp. enterica serovar Typhi PM016/13 which was isolated from well water during a typhoid outbreak in Kelantan, Malaysia, in 2013. Copyright © 2015 Muhamad Harish et al.

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Sunday, July 7, 2019

The genome sequence of the Antarctic bullhead notothen reveals evolutionary adaptations to a cold environment.

BackgroundAntarctic fish have adapted to the freezing waters of the Southern Ocean. Representative adaptations to this harsh environment include a constitutive heat shock response and the evolution of an antifreeze protein in the blood. Despite their adaptations to the cold, genome-wide studies have not yet been performed on these fish due to the lack of a sequenced genome. Notothenia coriiceps, the Antarctic bullhead notothen, is an endemic teleost fish with a circumpolar distribution and makes a good model to understand the genomic adaptations to constant sub-zero temperatures.ResultsWe provide the draft genome sequence and annotation for N. coriiceps. Comparative genome-wide analysis…

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