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Thursday, August 27, 2020

Immunology Brochure: Invaluable insights into immunology

In order to understand the molecular mechanisms governing the outcomes of disease, health and survival, immunologists have to characterize exceptionally complex genomic regions, like major histocompatibility complex (MHC), killer cell immune receptors (KIR), and the B and T-cell immune repertoire. Single Molecule, Real-Time (SMRT) Sequencing delivers the long read lengths, uniform coverage and high accuracy necessary to comprehensively and confidently resolve these immune sub-genomic regions. The granularity of data generated by PacBio® reads provides new access to imputation-free characterization of genes and haplotypes for invaluable genomic insights to advance disease association and evolutionary research.

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Thursday, August 27, 2020

Case Study: SMRT sequencing brings clarity to HIV vaccine and transplant research at the Wisconsin national primate research center

The Wisconsin National Primate Research Center (WNPRC) is a leading Major Histocompatibility Complex (MHC) typing lab that focuses on monkeys. While many scientists are familiar with the importance of characterizing the histocompatibility region of the human genome for applications like disease research or tissue typing before organ transplantation, fewer are aware of the need to accurately type this region in non-human primates. At the primate research lab, part of the University of Wisconsin- Madison, scientists are analyzing immune regions to help test potential HIV vaccines and AIDS therapies. Their work is essential for understanding the effects of treatment ahead of…

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Tuesday, April 21, 2020

Report from the Eleventh Killer Immunoglobulin-like Receptor (KIR) Workshop: Novel insights on KIR polymorphism, ligand recognition, expression and function.

The Eleventh Killer Immunoglobulin-like Receptor (KIR) Workshop was held in Camogli (Genoa, Italy) in October 2018. This congress brought together 113 participants working on KIR field. Fifty-eight studies have been presented, the majority of which included unpublished data. Thus, KIR workshop, allowing the meeting of people sharing their knowledge and experience in a friendly atmosphere, still represents a special event of fruitful discussion and exchange of novel breakthrough, results, and ideas. In this report, we summarize all the scientific contributions highlighting the most recent advances in KIR field. Forty abstracts presented at the KIR Workshop are published in this issue.…

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Monday, March 30, 2020

ASHI PacBio Workshop: KIR haplotypes – The long and short of it

KIR haplotypes can be determined by physical and computational and statistical methods. Martin Maiers from National Bone Marrow Donor Program (NMDP) presents a summary of their work to determine KIR genomic content for use in clinical transplantation, outcomes of HLA sequencing of KIR region across a variety of methods and shares their data from recent experiments using PacBio single-molecule sequencing of fosmid libraries.

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Monday, March 30, 2020

AGBT Virtual Poster: Insight into MHC and KIR genomic regions associated with autoimmune disease

Dan Geraghty from the Fred Hutchinson Cancer Research Center presents his AGBT poster on a new PacBio-based solution to sequence extended genomic regions — in this case, KIR and MHC, two of the most variable regions of the human genome. He reports data revealing for the first time regions that may be associated with autoimmune diseases such as diabetes, rheumatoid arthritis, and multiple sclerosis, and also shows that sequences were phased, complete, and highly accurate.

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Monday, March 30, 2020

Podcast: Major sequencing projects should be done with long reads

Dan Geraghty explains that while there have been decades’ worth of studies associating the genetics of the major histocompatibility complex (MHC), and the highly polymorphic HLA class 1 and 2 genes, we still haven’t found the key mutations for a variety of different autoimmune diseases such as type 1 diabetes, rheumatoid arthritis, multiple sclerosis, and others. Enormous amounts of linkage disequilibrium in these regions are one factor, as is getting information in phase, so larger stretches of sequence are needed. Recently Geraghty has begun using SMRT Technology with hopes of drilling down to the causal genetics. 

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Monday, March 30, 2020

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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Wednesday, February 26, 2020

Assembly of complete KIR haplotypes from a diploid individual by the direct sequencing of full-length fosmids.

We show that linearizing and directly sequencing full-length fosmids simplifies the assembly problem such that it is possible to unambiguously assemble individual haplotypes for the highly repetitive 100-200 kb killer Ig-like receptor (KIR) gene loci of chromosome 19. A tiling of targeted fosmids can be used to clone extended lengths of genomic DNA, 100s of kb in length, but repeat complexity in regions of particular interest, such as the KIR locus, means that sequence assembly of pooled samples into complete haplotypes is difficult and in many cases impossible. The current maximum read length generated by SMRT Sequencing exceeds the length…

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Wednesday, February 26, 2020

Unique haplotype structure determination in human genome using Single Molecule, Real-Time (SMRT) Sequencing of targeted full-length fosmids.

Determination of unique individual haplotypes is an essential first step toward understanding how identical genotypes having different phases lead to different biological interpretations of function, phenotype, and disease. Genome-wide methods for identifying individual genetic variation have been limited in their ability to acquire phased, extended, and complete genomic sequences that are long enough to assemble haplotypes with high confidence. We explore a recombineering approach for isolation and sequencing of a tiling of targeted fosmids to capture interesting regions from human genome. Each individual fosmid contains large genomic fragments (~35?kb) that are sequenced with long-read SMRT technology to generate contiguous long…

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Wednesday, February 26, 2020

Genomic Architecture of the KIR and MHC-B and -C Regions in Orangutan

PacBio 2013 User Group Meeting Presentation Slides: Lisbeth Guethlein from Stanford University School of Medicine looked at highly repetitive and variable immune regions of the orangutan genome. Guethlein reported that “PacBio managed to accomplish in a week what I have been working on for a couple years” (with Sanger sequencing), and the results were concordant. “Long story short, I was a happy customer.”

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