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Thursday, January 7, 2021

Case Study: Sequencing an historic bacterial collection for the future

The UK’s National Collection of Type Cultures (NCTC) is a unique collection of more than 5,000 expertly preserved and authenticated bacterial cultures, many of historical significance. Founded in 1920, NCTC is the longest established collection of its type anywhere in the world, with a history of its own that has reflected — and contributed to — the evolution of microbiology for more than 100 years.

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Wednesday, January 6, 2021

Podcast: Frontiers of sequencing – Putting long reads and graph assemblies to work

The Mike Schatz lab at Cold Spring Harbor is well know for de novo genome assemblies and their work on structural variation in cancer genomes. In this Mendelspod podcast, lab leader, Mike Schatz, and doctorate student, Maria Nattestad tell of two new projects that include the de novo assembly of a very difficult but important flatworm genome and, secondly, making better variant calls for oncogenes such as HER2.

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Wednesday, January 6, 2021

Podcast: A home run on the first hit – PacBio’s Jonas Korlach

From Mendelspod: Jonas Korlach is a natural storyteller—a rare trait in a scientist who is more comfortable presenting data than talking of himself. Jonas is the co-inventor of PacBio’s SMRT (single molecule, real time) sequencing, and we wanted to hear from him directly how it all got started, and also when the team realized that they had something big with long reads and close to 100X coverage. How many of us can boast of hitting it out of the park on our first try?

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Wednesday, January 6, 2021

Webinar: SMRT Sequencing applications for human genomics and medicine

In this webinar, Adam Ameur of SciLifeLab at Uppsala University shares how he uses Single Molecule, Real-Time (SMRT) Sequencing applications for medical diagnostics and human genetics research, including sequencing of single genes and de novo assembly of human genomes as well as a new method for detection of CRISPR-Cas9 off-targets.

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Tuesday, December 22, 2020

Comparative metagenome-assembled genome analysis of “Candidatus Lachnocurva vaginae”, formerly known as Bacterial Vaginosis Associated bacterium – 1 (BVAB1)

Bacterial Vaginosis Associated bacterium 1 (BVAB1) is an as-yet uncultured bacterial species found in the human vagina that belongs to the family Lachnospiraceae within the order Clostridiales. As its name suggests, this bacterium is often associated with bacterial vaginosis (BV), a common vaginal disorder that has been shown to increase a woman’s risk for HIV, Chlamydia trachomatis, and Neisseria gonorrhoeae infections as well as preterm birth. Further, BVAB1 is associated with the persistence of BV following metronidazole treatment, increased vaginal inflammation, and adverse obstetrics outcomes. There is no available complete genome sequence of BVAB1, which has made it di?cult to…

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Tuesday, December 22, 2020

New discoveries from closing Salmonella genomes using Pacific Biosciences continuous long reads.

The newer hierarchical genome assembly process (HGAP) performs de novo assembly using data from a single PacBio long insert library. To assess the benefits of this method, DNA from several Salmonella enterica serovars was isolated from a pure culture. Genome sequencing was performed using Pacific Biosciences RS sequencing technology. The HGAP process enabled us to close sixteen Salmonella subsp. enterica genomes and their associated mobile elements: The ten serotypes include: Salmonella enterica subsp. enterica serovar Enteritidis (S. Enteritidis) S. Bareilly, S. Heidelberg, S. Cubana, S. Javiana and S. Typhimurium, S. Newport, S. Montevideo, S. Agona, and S. Tennessee. In addition,…

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Tuesday, December 22, 2020

HLA variant identification techniques

The Human Leukocyte Antigen (HLA) genes located on chromosome 6 are responsible for regulating immune function via antigen presentation and are one of the determining factors for stem cell and organ transplantation compatibility. Additionally various alleles within this region have been implicated in autoimmune disorders, cancer, vaccine response and both non-infectious and infectious disease risk. The HLA region is highly variable; containing repetitive regions; and co-dominantly expressed genes. This complicates short read mapping and means that assessing the effect of variation within a gene requires full phase information to resolve haplotypes.One solution to the problem of HLA identification is the…

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Tuesday, December 22, 2020

Analysis of 37,000 Caucasian samples reveals tight linkage between SNP RS9277534 and high resolution typing of HLA-DPB1

HLA-DPB1 mismatching between patients and unrelated donors is known to increase the risk of acute graft-versus-host-disease (GvHD) after hematopoietic stem cell transplantation. If only HLA-DPB1 mismatched donors are available, the genotype defined by the Single Nucleotide Polymorphism (SNP) rs9277534 can be used to select mismatched donors that are well-tolerated. However, since rs9277534 resides within the 3’ untranslated region (UTR), it usually is not analyzed during DPB1 routine typing.

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Tuesday, December 22, 2020

Full-length cDNA sequencing of prokaryotic transcriptome and metatranscriptome samples

Next-generation sequencing has become a useful tool for studying transcriptomes. However, these methods typically rely on sequencing short fragments of cDNA, then attempting to assemble the pieces into full-length transcripts. Here, we describe a method that uses PacBio long reads to sequence full-length cDNAs from individual transcriptomes and metatranscriptome samples. We have adapted the PacBio Iso-Seq protocol for use with prokaryotic samples by incorporating RNA polyadenylation and rRNA-depletion steps. In conjunction with SMRT Sequencing, which has average readlengths of 10-15 kb, we are able to sequence entire transcripts, including polycistronic RNAs, in a single read. Here, we show full-length bacterial…

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Tuesday, December 22, 2020

SMRT-Cappable-seq reveals the complex operome of bacteria

SMRT-Cappable-seq combines the isolation of full-length prokaryotic primary transcripts with long read sequencing technology. It is the first experimental methodology to sequence entire prokaryotic transcripts. It identifies the transcription start site and termination site, thereby directly defines the operon structures genome-wide in prokaryotes. Applied to E.coli, SMRT-Cappable-seq identifies a total of ~2300 operons, among which ~900 are novel. Importantly, our result reveals a pervasive read-through of previous experimentally validated transcription termination sites. Termination read-through represents a powerful strategy to control gene expression. Taken together this data provides a first glance at the complexity of the ‘operome’ in bacteria and presents…

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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

Chromosome-level reference genome of X12, a highly virulent race of the soybean cyst nematode Heterodera glycines.

Soybean cyst nematode (SCN, Heterodera glycines) is a major pest of soybean that is spreading across major soybean production regions worldwide. Increased SCN virulence has recently been observed in both the United States and China. However, no study has reported a genome assembly for H. glycines at the chromosome scale. Herein, the first chromosome-level reference genome of X12, an unusual SCN race with high infection ability, is presented. Using whole-genome shotgun (WGS) sequencing, PacBio sequencing, Illumina paired-end sequencing, 10X Genomics linked reads and high-throughput chromatin conformation capture (Hi-C) genome scaffolding techniques, a 141.01-Mb assembled genome was obtained with scaffold and…

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