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Friday, February 26, 2021

An update on goat genomics

Goats are specialized in dairy, meat and fiber production, being adapted to a wide range of environmental conditions and having a large economic impact in developing countries. In the last years, there have been dramatic advances in the knowledge of the structure and diversity of the goat genome/transcriptome and in the development of genomic tools, rapidly narrowing the gap between goat and related species such as cattle and sheep. Major advances are: 1) publication of a de novo goat genome reference sequence; 2) Development of whole genome high density RH maps, and; 3) Design of a commercial 50K SNP array.…

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Friday, February 26, 2021

A comprehensive lincRNA analysis: From conifers to trees

We have produced an updated annotation of the Norway spruce genome on the basis of an in siliconormalised set of RNA-Seq data obtained from 1,529 samples and comprising 15.5 billion paired-end Illumina HiSeq reads complemented by 18Mbp of PacBio cDNA data (3.2M sequences). In addition to augmenting and refining the previous protein coding gene annotation, here we focus on the addition of long intergenic non-coding RNA (lincRNA) and micro RNA (miRNA) genes. In addition to non-coding loci, our analyses also identified protein coding genes that had been missed by the initial genome annotation and enabled us to update the annotation…

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Friday, February 26, 2021

Resolving KIR genotypes and haplotypes simultaneously using Single Molecule, Real-Time Sequencing

The killer immunoglobulin-like receptors (KIR) genes belong to the immunoglobulin superfamily and are widely studied due to the critical role they play in coordinating the innate immune response to infection and disease. Highly accurate, contiguous, long reads, like those generated by SMRT Sequencing, when combined with target-enrichment protocols, provide a straightforward strategy for generating complete de novo assembled KIR haplotypes. We have explored two different methods to capture the KIR region; one applying the use of fosmid clones and one using Nimblegen capture.

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Friday, February 26, 2021

Whole gene sequencing of KIR-3DL1 with SMRT Sequencing and the distribution of allelic variants in different ethnic groups

The killer-cell immunoglobulin-like receptor (KIR) gene family are involved in immune modulation during viral infection, autoimmune disease and in allogeneic stem cell transplantation. Most KIR gene diversity studies and their impact on the transplant outcome is performed by gene absence/presence assays. However, it is well known that KIR gene allelic variations have biological significance. Allele level typing of KIR genes has been very challenging until recently due to the homologous nature of those genes and very long intronic sequences. SMRT (Single Molecule Real-Time) Sequencing generates average long reads of 10 to 15 kb and allows us to obtain in-phase long…

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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

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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Saturday, February 20, 2021

Case Study: Diving Deep – Revealing the mysteries of marine life with SMRT Sequencing

Many scientists are using PacBio Single Molecule, Real-Time (SMRT) Sequencing to explore the genomes and transcriptomes of a wide variety of marine species and ecosystems. These studies are already adding to our understanding of how marine species adapt and evolve, contributing to conservation efforts, and informing how we can optimize food production through efficient aquaculture.

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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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Friday, February 5, 2021

AGBT PacBio Workshop: High-throughput HLA class I whole gene and HLA class II long range typing on PacBio RSII and Sequel Platforms

In a talk at AGBT 2017, Histogenetics CEO Nezih Cereb reported on how SMRT Sequencing is allowing his team to produce full-length, phased sequences for HLA alleles, which are important for matching organ transplants to recipients. The company is typing thousands of samples per day on their PacBio RS II systems and their new Sequel System. Cereb noted that SMRT Sequencing is unique in its ability to reliably phase mutations in the HLA alleles without imputation. Cereb concluded with his plans to use this approach for other complex regions, such as KIR, and announced their continued increasing HLA typing capacity…

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Friday, February 5, 2021

Webinar: Understanding SARS-CoV-2 and host immune response to COVID-19 with PacBio sequencing

Studying microbial genomics and infectious disease? Learn how the PacBio Sequel II System can help advance your research, with first-hand perspectives from scientists who are investigating SARS-CoV-2 and COVID-19. In this webinar, Melissa Laird-Smith (Mt. Sinai School of Medicine) discusses her work evaluating the impact of host immune restriction in health and disease with high resolution HLA typing. She is joined by Corey Watson (University of Louisville School of Medicine) who talks about overcoming complexity to elucidate the role of IGH haplotype diversity in antibody-mediated immunity. Hosted by Meredith Ashby, Director of Microbial Genomics at PacBio. Access additional PacBio resources…

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Friday, February 5, 2021

PacBio Workshop: Understanding the biology of genomes with HiFi sequencing

The utility of new highly accurate long reads, or HiFi reads, was first demonstrated for calling all variant types in human genomes. It has since been shown that HiFi reads can be used to generate contiguous, complete, and accurate human genomes, even in repeat structures such as centromeres and telomeres. In this virtual workshop scientists from PacBio as well as Tina Graves-Lindsay from the McDonnell Genome Institute at Washington University share the many improvements we’ve made to HiFi sequencing in the past year, tools that take advantage of HiFi data for variant detection and assembly, and examples in numerous genomics…

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Friday, February 5, 2021

Webinar: Opportunities for using PacBio Long-read sequencing for COVID-19 research

In this Labroots webinar, Meredith Ashby, Director of Microbial Genomics at PacBio, describes the utility of highly accurate long-read sequencing, known as HiFi sequencing, to understand the SARs-CoV-2 viral genome. HiFi sequencing enables mutation phasing and rare variant detection to understand viral stability and mutation rates, as well as providing insights into viral population structure for monitoring viral evolution. Ashby also shares how HiFi sequencing can be used to explore the host immune response to COVID-19, specifically by providing full-length sequencing of the B cell repertoire, IGH locus and HLA genes. Access additional COVID-19 Sequencing Tools and Resources at at…

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