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Tuesday, April 21, 2020

The genome of the soybean cyst nematode (Heterodera glycines) reveals complex patterns of duplications involved in the evolution of parasitism genes.

Heterodera glycines, commonly referred to as the soybean cyst nematode (SCN), is an obligatory and sedentary plant parasite that causes over a billion-dollar yield loss to soybean production annually. Although there are genetic determinants that render soybean plants resistant to certain nematode genotypes, resistant soybean cultivars are increasingly ineffective because their multi-year usage has selected for virulent H. glycines populations. The parasitic success of H. glycines relies on the comprehensive re-engineering of an infection site into a syncytium, as well as the long-term suppression of host defense to ensure syncytial viability. At the forefront of these complex molecular interactions are…

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Sunday, September 22, 2019

Complete genome sequence of Enterococcus durans Oregon-R-modENCODE strain BDGP3, a lactic acid bacterium found in the Drosophila melanogaster gut

Enterococcus durans Oregon-R-modENCODE strain BDGP3 was isolated from the Drosophila melanogaster gut for functional host-microbe interaction studies. The complete genome is composed of a single circular genome of 2,983,334 bp, with a G+C content of 38%, and a single plasmid of 5,594 bp. Copyright © 2017 Wan et al.

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Sunday, September 22, 2019

A survey of the sorghum transcriptome using single-molecule long reads.

Alternative splicing and alternative polyadenylation (APA) of pre-mRNAs greatly contribute to transcriptome diversity, coding capacity of a genome and gene regulatory mechanisms in eukaryotes. Second-generation sequencing technologies have been extensively used to analyse transcriptomes. However, a major limitation of short-read data is that it is difficult to accurately predict full-length splice isoforms. Here we sequenced the sorghum transcriptome using Pacific Biosciences single-molecule real-time long-read isoform sequencing and developed a pipeline called TAPIS (Transcriptome Analysis Pipeline for Isoform Sequencing) to identify full-length splice isoforms and APA sites. Our analysis reveals transcriptome-wide full-length isoforms at an unprecedented scale with over 11,000 novel…

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Sunday, September 22, 2019

Reference assembly and annotation of the Pyrenophora teres f. teres isolate 0-1.

Pyrenophora teres f.teres, the causal agent of net form net blotch (NFNB) of barley, is a destructive pathogen in barley-growing regions throughout the world. Typical yield losses due to NFNB range from 10 to 40%; however, complete loss has been observed on highly susceptible barley lines where environmental conditions favor the pathogen. Currently, genomic resources for this economically important pathogen are limited to a fragmented draft genome assembly and annotation, with limited RNA support of theP. teresf.teresisolate 0-1. This research presents an updated 0-1 reference assembly facilitated by long-read sequencing and scaffolding with the assistance of genetic linkage maps. Additionally,…

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Sunday, September 22, 2019

A whole genome assembly of the horn fly, Haematobia irritans, and prediction of genes with roles in metabolism and sex determination.

Haematobia irritans, commonly known as the horn fly, is a globally distributed blood-feeding pest of cattle that is responsible for significant economic losses to cattle producers. Chemical insecticides are the primary means for controlling this pest but problems with insecticide resistance have become common in the horn fly. To provide a foundation for identification of genomic loci for insecticide resistance and for discovery of new control technology, we report the sequencing, assembly, and annotation of the horn fly genome. The assembled genome is 1.14 Gb, comprising 76,616 scaffolds with N50 scaffold length of 23 Kb. Using RNA-Seq data, we have…

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Sunday, July 7, 2019

Sequence analysis of Staphylococcus hyicus ATCC 11249T, an etiological agent of exudative epidermitis in swine, reveals a type VII secretion system locus and a novel 116-kilobase genomic island harboring toxin-encoding genes.

Staphylococcus hyicus is the primary etiological agent of exudative epidermitis in swine. Analysis of the complete genome sequence of the type strain revealed a locus encoding a type VII secretion system and a large chromosomal island harboring the genes encoding exfoliative toxin ExhA and an EDIN toxin homolog. Copyright © 2015 Calcutt et al.

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Sunday, July 7, 2019

Analysis of the complete Mycoplasma hominis LBD-4 genome sequence reveals strain-variable prophage insertion and distinctive repeat-containing surface protein arrangements.

The complete genome sequence of Mycoplasma hominis LBD-4 has been determined and the gene content ascribed. The 715,165-bp chromosome contains 620 genes, including 14 carried by a strain-variable prophage genome related to Mycoplasma fermentans MFV-1 and Mycoplasma arthritidis MAV-1. Comparative analysis with the genome of M. hominis PG21(T) reveals distinctive arrangements of repeat-containing surface proteins. Copyright © 2015 Calcutt and Foecking.

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Sunday, July 7, 2019

Complete genome sequence of Mycoplasma yeatsii strain GM274B (ATCC 43094).

Mycoplasma yeatsii is a goat mycoplasma species that, although an obligate parasite, accommodates this lifestyle as an inapparent commensalist. High-frequency transformation has also been reported for this species. The complete 895,051-bp genome sequence of strain GM274B has been determined, enabling an analysis of the features of this potential cloning host. Copyright © 2015 Calcutt et al.

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Sunday, July 7, 2019

High-quality draft genome sequence of actinobacterium Kibdelosporangium sp. MJ126-NF4, producer of type II polyketide azicemicins, using Illumina and PacBio Technologies.

Here, we report the high-quality draft genome sequence of actinobacterium Kibdelosporangium sp. MJ126-NF4, producer of the type II polyketide azicemicins, obtained using Illumina and PacBio sequencing technologies. The 11.75-Mbp genome contains >11,000 genes and 22 polyketide and nonribosomal peptide natural product gene clusters. Copyright © 2015 Ogasawara et al.

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Sunday, July 7, 2019

The mitochondrial genome of a Texas outbreak strain of the cattle tick, Rhipicephalus (Boophilus) microplus, derived from whole genome sequencing Pacific Biosciences and Illumina reads.

The cattle fever tick, Rhipicephalus (Boophilus) microplus is one of the most significant medical veterinary pests in the world, vectoring several serious livestock diseases negatively impacting agricultural economies of tropical and subtropical countries around the world. In our study, we assembled the complete R. microplus mitochondrial genome from Illumina and Pac Bio sequencing reads obtained from the ongoing R. microplus (Deutsch strain from Texas, USA) genome sequencing project. We compared the Deutsch strain mitogenome to the mitogenome from a Brazilian R. microplus and from an Australian cattle tick that has recently been taxonomically designated as Rhipicephalus australis after previously being…

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Sunday, July 7, 2019

Complete genome sequence of Kocuria palustris MU14/1.

Presented here is the first completely assembled genome sequence of Kocuria palustris, an actinobacterial species with broad ecological distribution. The single, circular chromosome of K. palustris MU14/1 comprises 2,854,447 bp, has a G+C content of 70.5%, and contains a deduced gene set of 2,521 coding sequences. Copyright © 2015 Calcutt and Foecking.

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Sunday, July 7, 2019

Molecular and biological characterization of a new isolate of guinea pig cytomegalovirus.

Development of a vaccine against congenital infection with human cytomegalovirus is complicated by the issue of re-infection, with subsequent vertical transmission, in women with pre-conception immunity to the virus. The study of experimental therapeutic prevention of re-infection would ideally be undertaken in a small animal model, such as the guinea pig cytomegalovirus (GPCMV) model, prior to human clinical trials. However, the ability to model re-infection in the GPCMV model has been limited by availability of only one strain of virus, the 22122 strain, isolated in 1957. In this report, we describe the isolation of a new GPCMV strain, the CIDMTR…

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Sunday, July 7, 2019

Draft genome sequence of a metabolically diverse Antarctic supraglacial stream organism, Polaromonas sp. strain CG9_12, determined using Pacific Biosciences Single-Molecule Real-Time Sequencing Technology.

Polaromonas species are found in a diversity of environments and are particularly common in icy ecosystems. Polaromonas sp. strain CG9_12 is an aerobic, Gram-negative, catalase-positive, white-pigmented bacterium of the Proteobacteria phylum. Here, we present the draft genome sequence of Polaromonas sp. strain CG9_12, isolated from an Antarctic supraglacial stream. Copyright © 2014 Smith et al.

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Sunday, July 7, 2019

Genomic exploration of individual giant ocean viruses.

Viruses are major pathogens in all biological systems. Virus propagation and downstream analysis remains a challenge, particularly in the ocean where the majority of their microbial hosts remain recalcitrant to current culturing techniques. We used a cultivation-independent approach to isolate and sequence individual viruses. The protocol uses high-speed fluorescence-activated virus sorting flow cytometry, multiple displacement amplification (MDA), and downstream genomic sequencing. We focused on ‘giant viruses’ that are readily distinguishable by flow cytometry. From a single-milliliter sample of seawater collected from off the dock at Boothbay Harbor, ME, USA, we sorted almost 700 single virus particles, and subsequently focused on…

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