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Friday, February 26, 2021

Genome and transcriptome of the refeneration-competent flatworm, Macrostomum lignano

The free-living flatworm, Macrostomum lignano, much like its better known planarian relative, Schmidtea mediterranea, has an impressive regenerative capacity. Following injury, this species has the ability to regenerate almost an entirely new organism. This is attributable to the presence of an abundant somatic stem cell population, the neoblasts. These cells are also essential for the ongoing maintenance of most tissues, as their loss leads to irreversible degeneration of the animal. This set of unique properties makes a subset of flatworms attractive organisms for studying the evolution of pathways involved in tissue self-renewal, cell fate specification, and regeneration. The use of…

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Friday, February 26, 2021

Allelic specificity of immunoglobulin heavy chain (IGH@) translocation in B-cell acute lymphoblastic leukemia (B-ALL) unveiled by long-read sequencing

Oncogenic fusion of IGH-DUX4 has recently been reported as a hallmark that defines a B-ALL subtype present in up to 7% of adolescents and young adults B-ALL. The translocation of DUX4 into IGH results in aberrant activation of DUX4 by hijacking the intronic IGH enhancer (Eµ). How IGH-DUX4 translocation interplays with IGH allelic exclusion was never been explored. We investigated this in Nalm6 B-ALL cell line, using long-read (PacBio Iso-Seq method and 10X Chromium WGS), short-read (Illumina total stranded RNA and WGS), epigenome (H3K27ac ChIP-seq, ATAC-seq) and 3-D genome (Hi-C, H3K27ac HiChIP, Capture-C).

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Friday, February 26, 2021

Detection and phasing of small variants in Genome in a Bottle samples with highly accurate long reads

Introduction: Long-read PacBio SMRT Sequencing has been applied successfully to assemble genomes and detect structural variants. However, due to high raw read error rates of 10-15%, it has remained difficult to call small variants from long reads. Recent improvements in library preparation, sequencing chemistry, and instrument yield have increased length, accuracy, and throughput of PacBio Circular Consensus (CCS) reads, resulting in 10-20 kb “HiFi” reads with mean read quality above 99%. Materials and Methods: We sequenced 11 kb size-selected libraries from the Genome in a Bottle (GIAB) human reference samples HG001, HG002, and HG005 to approximately 30-fold coverage on the…

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Friday, February 26, 2021

Metagenomic analysis of type II diabetes gut microbiota using PacBio HiFi reads reveals taxonomic and functional differences

In the past decade, the human microbiome has been increasingly shown to play a major role in health. For example, imbalances in gut microbiota appear to be associated with Type II diabetes mellitus (T2DM) and cardiovascular disease. Coronary artery disease (CAD) is a major determinant of the long-term prognosis among T2DM patients, with a 2- to 4-fold increased mortality risk when present. However, the exact microbial strains or functions implicated in disease need further investigation. From a large study with 523 participants (185 healthy controls, 186 T2DM patients without CAD, and 106 T2DM patients with CAD), 3 samples from each…

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Friday, February 5, 2021

Movie: The new biology

This documentary film features the wave of cutting-edge technologies that now provide the opportunity to create predictive models of living systems, and gain wisdom about the fundamental nature of life itself. The potential impact for humanity is immense: from fighting complex diseases such as cancer, enabling proactive surveillance of virulent pathogens, and increasing food crop production.

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Friday, February 5, 2021

Podcast: Going beyond the $1,000 genome with Mark Gerstein

Mark Gerstein is the co-director of the Yale Computational Biology and Bioinformatics program where he focuses on better annotation of the human genome and better ways to mine big genomics data. He has played a big role in some of the large genomics initiatives since the first human genome project, including ENCODE and the 1,000 Genomes Project. “I’m very enthusiastic, of course, about the thousand dollar genome, but I don’t think that a true human genome has arrived for a thousand dollars,” Mark says at the outset of this Mendelspod interview. “The great excitement of next generation sequencing—which is deserved—has…

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Friday, February 5, 2021

AGBT PacBio Workshop: De novo sequencing of the naked mole rat genome

At AGBT 2017, Margaret Roy from Calico Life Sciences discussed a de novo genome sequencing effort for the naked mole rat. This animal has a remarkably long life span and resistance to cancer, both of which make it interesting for studies of life extension. The team is using SMRT Sequencing for a more complete, contiguous assembly than the two existing short-read-based assemblies. Included: data from the Sequel System.

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Friday, February 5, 2021

User Group Meeting: New genotype to phenotype associations in viral metagenomes enabled by SMRT Sequencing

In this PacBio User Group Meeting lightning talk, Shawn Polson of the University of Delaware speaks about viral metagenomes, which are more challenging to distinguish than their bacterial counterparts because viruses have no 16S equivalent. By using SMRT Sequencing, his team generated higher-resolution data about viral genomes and aims to use this information as a guide to how these genomes function.

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Tuesday, April 21, 2020

A robust benchmark for germline structural variant detection

New technologies and analysis methods are enabling genomic structural variants (SVs) to be detected with ever-increasing accuracy, resolution, and comprehensiveness. Translating these methods to routine research and clinical practice requires robust benchmark sets. We developed the first benchmark set for identification of both false negative and false positive germline SVs, which complements recent efforts emphasizing increasingly comprehensive characterization of SVs. To create this benchmark for a broadly consented son in a Personal Genome Project trio with broadly available cells and DNA, the Genome in a Bottle (GIAB) Consortium integrated 19 sequence-resolved variant calling methods, both alignment- and de novo assembly-based,…

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Tuesday, April 21, 2020

Updated assembly resource of Phytophthora ramorum Pr102 isolate incorporating long reads from PacBio sequencing.

The NA1 clonal lineage of Phytophthora ramorum is responsible for Sudden Oak Death, an epidemic that has devastated California’s coastal forest ecosystems. An NA1 isolate Pr102 derived from coast live oak in California was previously sequenced and reported with 65 Mb assembly containing 12 Mb gaps in 2576 scaffolds. Here we report an improved 70 Mb genome in 1512 scaffolds with 6752 bp gaps after incorporating PacBio P5-C3 longreads. This assembly contains 19494 gene models (average gene length 2515 bp) compared to 16134 genes (average gene length of 1673 bp) in the previous version. We predicted 29 new RXLRs and…

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Tuesday, April 21, 2020

The use of Online Tools for Antimicrobial Resistance Prediction by Whole Genome Sequencing in MRSA and VRE.

The antimicrobial resistance (AMR) crisis represents a serious threat to public health and has resulted in concentrated efforts to accelerate development of rapid molecular diagnostics for AMR. In combination with publicly-available web-based AMR databases, whole genome sequencing (WGS) offers the capacity for rapid detection of antibiotic resistance genes. Here we studied the concordance between WGS-based resistance prediction and phenotypic susceptibility testing results for methicillin-resistant Staphylococcus aureus (MRSA) and vancomycin resistant Enterococcus (VRE) clinical isolates using publicly-available tools and databases.Clinical isolates prospectively collected at the University of Pittsburgh Medical Center between December 2016 and December 2017 underwent WGS. Antibiotic resistance gene…

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Tuesday, April 21, 2020

Microbial diversity in the tick Argas japonicus (Acari: Argasidae) with a focus on Rickettsia pathogens.

The soft tick Argas japonicus mainly infests birds and can cause human dermatitis; however, no pathogen has been identified from this tick species in China. In the present study, the microbiota in A. japonicus collected from an epidemic community was explored, and some putative Rickettsia pathogens were further characterized. The results obtained indicated that bacteria in A. japonicus were mainly ascribed to the phyla Proteobacteria, Firmicutes and Actinobacteria. At the genus level, the male A. japonicus harboured more diverse bacteria than the females and nymphs. The bacteria Alcaligenes, Pseudomonas, Rickettsia and Staphylococcus were common in nymphs and adults. The abundance…

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