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Sunday, October 25, 2020

PAG PacBio Workshop: De novo assembly of a complex panicoid grass genome using ultra-long PacBio reads with P6-C4 chemistry

Robert VanBuren of the Danforth Plant Science Center and winner of the 2014 SMRT Grant Program presents a de novo assembly of the Oro grass genome (Oropetium thomaeum). The reference genome will aid scientist studying drought tolerance in common crop species, especially cereals, though comparative genomics to understand potential key genetic underpinnings for this “resurrection” trait. Initial comparative results to Brachypodium and maize are presented, as well as secondary analysis to identify key metabolic traits.

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Sunday, October 25, 2020

ASHG PacBio Workshop: Resolving complexity of the human genome

Evan Eichler, Howard Hughes Medical Investigator from the University of Washington discusses his use of the PacBio system to study difficult-to-sequence regions of the human and chimp genomes. Eichler has identified a number of rapidly evolving hot spots in the human genome that are associated with disease. These regions are quite long and have extremely repetitive DNA sequence, making them difficult to elucidate with short-read sequencing and very expensive to interrogate with Sanger sequencing. Eichler’s goal is to fill in the missing regions of the human genome reference, many of which contain segmental duplications.

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Tuesday, April 21, 2020

Characterization of Reference Materials for Genetic Testing of CYP2D6 Alleles: A GeT-RM Collaborative Project.

Pharmacogenetic testing increasingly is available from clinical and research laboratories. However, only a limited number of quality control and other reference materials currently are available for the complex rearrangements and rare variants that occur in the CYP2D6 gene. To address this need, the Division of Laboratory Systems, CDC-based Genetic Testing Reference Material Coordination Program, in collaboration with members of the pharmacogenetic testing and research communities and the Coriell Cell Repositories (Camden, NJ), has characterized 179 DNA samples derived from Coriell cell lines. Testing included the recharacterization of 137 genomic DNAs that were genotyped in previous Genetic Testing Reference Material Coordination…

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Tuesday, April 21, 2020

Chlorella vulgaris genome assembly and annotation reveals the molecular basis for metabolic acclimation to high light conditions.

Chlorella vulgaris is a fast-growing fresh-water microalga cultivated at the industrial scale for applications ranging from food to biofuel production. To advance our understanding of its biology and to establish genetics tools for biotechnological manipulation, we sequenced the nuclear and organelle genomes of Chlorella vulgaris 211/11P by combining next generation sequencing and optical mapping of isolated DNA molecules. This hybrid approach allowed to assemble the nuclear genome in 14 pseudo-molecules with an N50 of 2.8 Mb and 98.9% of scaffolded genome. The integration of RNA-seq data obtained at two different irradiances of growth (high light-HL versus low light -LL) enabled…

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Tuesday, April 21, 2020

An improved pig reference genome sequence to enable pig genetics and genomics research

The domestic pig (Sus scrofa) is important both as a food source and as a biomedical model with high anatomical and immunological similarity to humans. The draft reference genome (Sscrofa10.2) represented a purebred female pig from a commercial pork production breed (Duroc), and was established using older clone-based sequencing methods. The Sscrofa10.2 assembly was incomplete and unresolved redundancies, short range order and orientation errors and associated misassembled genes limited its utility. We present two highly contiguous chromosome-level genome assemblies created with more recent long read technologies and a whole genome shotgun strategy, one for the same Duroc female (Sscrofa11.1) and…

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Tuesday, April 21, 2020

Emergence of plasmid-mediated high-level tigecycline resistance genes in animals and humans.

Tigecycline is a last-resort antibiotic that is used to treat severe infections caused by extensively drug-resistant bacteria. tet(X) has been shown to encode a flavin-dependent monooxygenase that modifies tigecycline1,2. Here, we report two unique mobile tigecycline-resistance genes, tet(X3) and tet(X4), in numerous Enterobacteriaceae and Acinetobacter that were isolated from animals, meat for consumption and humans. Tet(X3) and Tet(X4) inactivate all tetracyclines, including tigecycline and the newly FDA-approved eravacycline and omadacycline. Both tet(X3) and tet(X4) increase (by 64-128-fold) the tigecycline minimal inhibitory concentration values for Escherichia coli, Klebsiella pneumoniae and Acinetobacter baumannii. In addition, both Tet(X3) (A. baumannii) and Tet(X4) (E.…

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Tuesday, April 21, 2020

Complete Genome Sequence of a Parabacteroides distasonis Strain (CavFT hAR46) Isolated from a Gut Wall-Cavitating Microlesion in a Patient with Severe Crohn’s Disease.

Crohn’s disease (CD) is a chronic inflammatory bowel disease (IBD) of the digestive tract in humans. There is evidence that Parabacteroides distasonis could contribute to IBD. Here, we present the complete genome sequence of a strain designated CavFT-hAR46, which was isolated from a gut intramural cavernous fistulous tract (CavFT) microlesion in a CD patient.Copyright © 2019 Yang et al.

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Tuesday, April 21, 2020

Complete Genome Sequence of Dehalococcoides mccartyi Strain FL2, a Trichloroethene-Respiring Anaerobe Isolated from Pristine Freshwater Sediment.

Dehalococcoides mccartyi strain FL2 couples growth to hydrogen oxidation and reductive dechlorination of trichloroethene and cis- and trans-1,2-dichloroethenes. Strain FL2 has a 1.42-Mb genome with a G+C content of 47.0% and carries 1,465 protein-coding sequences, including 24 reductive dehalogenase genes.Copyright © 2019 Yan et al.

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Tuesday, April 21, 2020

Complete Genome and Plasmid Sequences of Seven Isolates of Salmonella enterica subsp. enterica Harboring the mcr-1 Gene Obtained from Food in China.

Seven Salmonella enterica subsp. enterica isolates were identified as carrying the mcr-1 gene, by using a real-time fluorescence quantitative PCR method, from a total of 2,558 isolates which were cultured from various food origins in China between 2011 and 2016. Few complete genomes of Salmonella strains harboring the mcr-1 gene have been reported to date, so we report here the complete genome and plasmid sequences of all of these isolates to provide useful references for understanding the prevalence of foodborne Salmonella enterica subsp. enterica isolates carrying mcr-1.Copyright © 2019 Hu et al.

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Tuesday, April 21, 2020

A Novel Bacteriophage Exclusion (BREX) System Encoded by the pglX Gene in Lactobacillus casei Zhang.

The bacteriophage exclusion (BREX) system is a novel prokaryotic defense system against bacteriophages. To our knowledge, no study has systematically characterized the function of the BREX system in lactic acid bacteria. Lactobacillus casei Zhang is a probiotic bacterium originating from koumiss. By using single-molecule real-time sequencing, we previously identified N6-methyladenine (m6A) signatures in the genome of L. casei Zhang and a putative methyltransferase (MTase), namely, pglX This work further analyzed the genomic locus near the pglX gene and identified it as a component of the BREX system. To decipher the biological role of pglX, an L. casei Zhang pglX mutant…

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Tuesday, April 21, 2020

First Complete Genome Sequence of Haematobacter massiliensis OT1 (Chromosome and Multiple Plasmids), Isolated from Human Skin.

Haematobacter massiliensis OT1 was isolated from human skin. This strain can catabolize 4-hydroxybenzoate. Here, we present the first complete whole-genome sequence of this species, which has one chromosome (2,467 kbp) and nine plasmids (total of 1,765 kbp). The analysis of the H. massiliensis OT1 genome indicated a potential for autotrophic growth.Copyright © 2019 Lim et al.

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