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Friday, February 26, 2021

SMRT Sequencing solutions for investigative studies to understand evolutionary processes.

Single Molecule, Real-Time (SMRT) Sequencing holds promise for addressing new frontiers to understand molecular mechanisms in evolution and gain insight into adaptive strategies. With read lengths exceeding 10 kb, we are able to sequence high-quality, closed microbial genomes with associated plasmids, and investigate large genome complexities, such as long, highly repetitive, low-complexity regions and multiple tandem-duplication events. Improved genome quality, observed at 99.9999% (QV60) consensus accuracy, and significant reduction of gap regions in reference genomes (up to and beyond 50%) allow researchers to better understand coding sequences with high confidence, investigate potential regulatory mechanisms in noncoding regions, and make inferences…

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Friday, February 26, 2021

SMRT Sequencing solutions for plant genomes and transcriptomes

Single Molecule, Real-Time (SMRT) Sequencing provides efficient, streamlined solutions to address new frontiers in plant genomes and transcriptomes. Inherent challenges presented by highly repetitive, low-complexity regions and duplication events are directly addressed with multi- kilobase read lengths exceeding 8.5 kb on average, with many exceeding 20 kb. Differentiating between transcript isoforms that are difficult to resolve with short-read technologies is also now possible. We present solutions available for both reference genome and transcriptome research that best leverage long reads in several plant projects including algae, Arabidopsis, rice, and spinach using only the PacBio platform. Benefits for these applications are further…

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Friday, February 26, 2021

A genome assembly of the domestic goat from 70x coverage of single molecule, real-time sequence.

Goat is an important source of milk, meat, and fiber, especially in developing countries. An advantage of goats as livestock is the low maintenance requirements and high adaptability compared to other milk producers. The global population of domestic goats exceeds 800 million. In Africa, goat production is characterized by low productivity levels, and attempts to introduce more productive breeds have met with poor success due in part to nutritional constraints. It has been suggested that incorporation of selective breeding within the herds adapted for survival could represent one approach to improving food security across Africa. A recently produced genome assembly…

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Friday, February 26, 2021

SMRT Sequencing of DNA and RNA samples extracted from formalin-fixed and paraffin embedded tissues using adaptive focused acoustics by Covaris.

Recent advances in next-generation sequencing have led to an increased use of formalin-fixed and paraffin-embedded (FFPE) tissues for medical samples in disease and scientific research. Single Molecule, Real-Time (SMRT) Sequencing offers a unique advantage for direct analysis of FFPE samples without amplification. However, obtaining ample long-read information from FFPE samples has been a challenge due to the quality and quantity of the extracted DNA. FFPE samples often contain damaged sites, including breaks in the backbone and missing or altered nucleotide bases, which directly impact sequencing and target enrichment. Additionally, the quality and quantity of the recovered DNA vary depending on…

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Friday, February 26, 2021

SMRT Sequencing of DNA and RNA samples extracted from formalin-fixed and paraffin-embedded tissues

Recent advances in next-generation sequencing have led to the increased use of formalin-fixed and paraffin-embedded (FFPE) tissues for medical samples in disease and scientific research. Single Molecule, Real-Time (SMRT) Sequencing offers a unique advantage in that it allows direct analysis of FFPE samples without amplification. However, obtaining ample long-read information from FFPE samples has been a challenge due to the quality and quantity of the extracted DNA. DNA samples extracted from FFPE often contain damaged sites, including breaks in the backbone and missing or altered nucleotide bases, which directly impact sequencing and amplification. Additionally, the quality and quantity of the…

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Friday, February 26, 2021

The MHC Diversity in Africa Project (MDAP) pilot – 125 African high resolution HLA types from 5 populations

The major histocompatibility complex (MHC), or human leukocyte antigen (HLA) in humans, is a highly diverse gene family with a key role in immune response to disease; and has been implicated in auto-immune disease, cancer, infectious disease susceptibility, and vaccine response. It has clinical importance in the field of solid organ and bone marrow transplantation, where donors and recipient matching of HLA types is key to transplanted organ outcomes. The Sanger based typing (SBT) methods currently used in clinical practice do not capture the full diversity across this region, and require specific reference sequences to deconvolute ambiguity in HLA types.…

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Friday, February 26, 2021

Profiling complex communities with highly accurate single molecule reads: cow rumen microbiomes

Determining compositions and functional capabilities of complex populations is often challenging, especially for sequencing technologies with short reads that do not uniquely identify organisms or genes. Long-read sequencing improves the resolution of these mixed communities, but adoption for this application has been limited due to concerns about throughput, cost and accuracy. The recently introduced PacBio Sequel System generates hundreds of thousands of long and highly accurate single-molecule reads per SMRT Cell. We investigated how the Sequel System might increase understanding of metagenomic communities. In the past, focus was largely on taxonomic classification with 16S rRNA sequencing. Recent expansion to WGS…

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Friday, February 26, 2021

T-cell receptor profiling using PacBio sequencing of SMARTer libraries

T-cells play a central part in the immune response in humans and related species. T-cell receptors (TCRs), heterodimers located on the T-cell surface, specifically bind foreign antigens displayed on the MHC complex of antigen-presenting cells. The wide spectrum of potential antigens is addressed by the diversity of TCRs created by V(D)J recombination. Profiling this repertoire of TCRs could be useful from, but not limited to, diagnosis, monitoring response to treatments, and examining T-cell development and diversification.

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Friday, February 26, 2021

De novo assembly and preliminary annotation of the Schizocardium californicum genome

Animals in the phylum Hemichordata have provided key understanding of the origins and development of body patterning and nervous system organization. However, efforts to sequence and assemble the genomes of highly heterozygous non-model organisms have proven to be difficult with traditional short read approaches. Long repetitive DNA structures, extensive structural variation between haplotypes in polyploid species, and large genome sizes are limiting factors to achieving highly contiguous genome assemblies. Here we present the highly contiguous de novo assembly and preliminary annotation of an indirect developing hemichordate genome, Schizocardium californicum, using SMRT Sequening long reads.

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Friday, February 26, 2021

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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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

ASHG Virtual Poster: The MHC Diversity in Africa Project (MDAP) pilot – 125 African high resolution HLA types from 5 populations

In this ASHG 2016 poster video, Martin Pollard from the Wellcome Trust Sanger Institute and the University of Cambridge describes an ambitious project to better represent natural variation in the complex MHC region by sequencing the locus in thousands of people from various populations in Africa. A pilot project in five populations has already revealed a lot of diversity in the region, which is important for human disease, vaccine response, and organ transplantation. Pollard says SMRT Sequencing is the only technology that can deliver the full-length haplotypes necessary to identify complete variation in this highly polymorphic complex. Plus: plans to…

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