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Friday, February 5, 2021

ASHG PacBio Workshop: SMRT Sequencing as a translational research tool to investigate germline, somatic and infectious diseases

Melissa Laird Smith discussed how the Icahn School of Medicine at Mount Sinai uses long-read sequencing for translational research. She gave several examples of targeted sequencing projects run on the Sequel System including CYP2D6, phased mutations of GLA in Fabry’s disease, structural variation breakpoint validation in glioblastoma, and full-length immune profiling of TCR sequences.

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Friday, February 5, 2021

ASHG PacBio Workshop: Identification and characterization of informative genetic structural variants for neurodegenerative diseases

Michael Lutz, from the Duke University Medical Center, discussed a recently published software tool that can now be used in a pipeline with SMRT Sequencing data to find structural variant biomarkers for neurodegenerative diseases with a focus on Alzheimer’s disease, ALS, and Lewy body dementia. His team is particularly interested in short sequence repeats and short tandem repeats, which have already been implicated in neurodegenerative disease.

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Friday, February 5, 2021

PAG PacBio Workshop: Comparative analyses of next generation technologies for generating chromosome-level reference genome assemblies

At PAG 2017, Rockefeller University’s Erich Jarvis offered an in-depth comparison of methods for generating highly contiguous genome assemblies, using hummingbird as the basis to evaluate a number of sequencing and scaffolding technologies. Analyses include gene content, error rate, chromosome metrics, and more. Plus: a long-read look at four genes associated with vocal learning.

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Friday, February 5, 2021

Tutorial: Long amplicon analysis application [SMRT Link v5.0.0]

This tutorial provides an overview of the Long Amplicon Analysis (LAA) application. The LAA algorithm generates highly accurate, phased and full-length consensus sequences from long amplicons. Applications of LAA include HLA typing, alternative haplotyping, and localized de novo assemblies of targeted genes. This tutorial covers features of SMRT Link v5.0.0.

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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: A paradigm shift in HLA sequencing: from exons to high-resolution allele-level HLA yyping

Human MHC class I genes HLA-A, -B, -C, and class II genes HLA -DR, -DQ, and -DP play a critical role in the immune system as primary factors responsible for organ transplant rejection. Additionally, the HLA genes are important targets for clinical and drug sensitivity research because of their direct or linkage-based association with several diseases, including cancer, and autoimmune diseases. HLA genes are highly polymorphic, and their diversity originates from exonic combinations as well as recombination events. With full-length gene sequencing, a significant increase of new alleles in the HLA database is expected, stressing the need for high-resolution sequencing.…

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Friday, February 5, 2021

Webinar: Addressing “NGS Dead Zones” with third generation PacBio sequencing

SMRT Sequencing is a DNA sequencing technology characterized by long read lengths and high consensus accuracy, regardless of the sequence complexity or GC content of the DNA sample. These characteristics can be harnessed to address medically relevant genes, mRNA transcripts, and other genomic features that are otherwise difficult or impossible to resolve. I will describe examples for such new clinical research in diverse areas, including full-length gene sequencing with allelic haplotype phasing, gene/pseudogene discrimination, sequencing extreme DNA contexts, high-resolution pharmacogenomics, biomarker discovery, structural variant resolution, full-length mRNA isoform cataloging, and direct methylation detection.

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Friday, February 5, 2021

ASHG PacBio Workshop: Multiplatform discovery of haplotype-resolved structural variation in human genome

In this ASHG 2017 presentation, Charles Lee of The Jackson Laboratory for Genomic Medicine presented work from the Human Genome Structural Variation Consortium. He shared data from efforts to utilize multiple platforms for the comprehensive discovery of structural variations—including insertions, deletions, inversions and mobile element insertions—in individual genomes. By combining various technologies, this research identified 7 times more structural variation per person than was previously known to exist.

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Friday, February 5, 2021

PAG Conference: Using cattle subspecies crosses to explore chromosome of origin expression through Iso-seq analysis

In this PAG 2018 presentation, John Williams of University of Adelaide, presents research on using PacBio SMRT Sequencing to explore the genetic origins of cattle subspecies, Angus (Bos taurus taurus) and Brahman (Bos taurus indicus). He shares RNA sequencing data using the PacBio Iso-Seq method to compare transcriptomes and phase allelic expression and describes how the IsoPhase technique enables evaluation of SNPs through transcriptome mapping back to the single genome of a cross-bred individual. Using a genomic and transcriptomic approach, two high-quality genomes from a single individual and gene isoforms specific to each subspecies are being identified.

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Tuesday, April 21, 2020

Variant Phasing and Haplotypic Expression from Single-molecule Long-read Sequencing in Maize

Haplotype phasing of genetic variants is important for interpretation of the maize genome, population genetic analysis, and functional genomic analysis of allelic activity. Accordingly, accurate methods for phasing full-length isoforms are essential for functional genomics study. In this study, we performed an isoform-level phasing study in maize, using two inbred lines and their reciprocal crosses, based on single-molecule full-length cDNA sequencing. To phase and analyze full-length transcripts between hybrids and parents, we developed a tool called IsoPhase. Using this tool, we validated the majority of SNPs called against matching short read data and identified cases of allele-specific, gene-level, and isoform-level…

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Tuesday, April 21, 2020

Potential of TLR-gene diversity in Czech indigenous cattle for resistance breeding as revealed by hybrid sequencing

A production herd of Czech Simmental cattle (Czech Red Pied, CRP), the conserved subpopulation of this breed, and the ancient local breed Czech Red cattle (CR) were screened for diversity in the antibacterial toll-like receptors (TLRs), which are members of the innate immune system. Polymerase chain reaction (PCR) amplicons of TLR1, TLR2, TLR4, TLR5, and TLR6 from pooled DNA samples were sequenced with PacBio technology, with 3–5×?coverage per gene per animal. To increase the reliability of variant detection, the gDNA pools were sequenced in parallel with the Illumina X-ten platform at low coverage (60× per gene). The diversity in conserved…

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Tuesday, April 21, 2020

Short communication: Identification of the pseudoautosomal region in the Hereford bovine reference genome assembly ARS-UCD1.2.

In cattle, the X chromosome accounts for approximately 3 and 6% of the genome in bulls and cows, respectively. In spite of the large size of this chromosome, very few studies report analysis of the X chromosome in genome-wide association studies and genomic selection. This lack of genetic interrogation is likely due to the complexities of undertaking these studies given the hemizygous state of some, but not all, of the X chromosome in males. The first step in facilitating analysis of this gene-rich chromosome is to accurately identify coordinates for the pseudoautosomal boundary (PAB) to split the chromosome into a…

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Tuesday, April 21, 2020

A Look to the Future: Pharmacogenomics and Data Technologies of Today and Tomorrow

The ability to measure chemical and physiologic states in tandem with good experimental design has enabled the discovery and characterization of a plethora of gene–drug interactions. Recent advances in methods to measure organic molecules and phenotypes, describe clinical states, and reason across federated data offer an increasingly precise set of technologies for pharmacogenomics discovery and clinical translation.

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Tuesday, April 21, 2020

Multi-platform discovery of haplotype-resolved structural variation in human genomes.

The incomplete identification of structural variants (SVs) from whole-genome sequencing data limits studies of human genetic diversity and disease association. Here, we apply a suite of long-read, short-read, strand-specific sequencing technologies, optical mapping, and variant discovery algorithms to comprehensively analyze three trios to define the full spectrum of human genetic variation in a haplotype-resolved manner. We identify 818,054 indel variants (

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Tuesday, April 21, 2020

Haplotype-aware diplotyping from noisy long reads.

Current genotyping approaches for single-nucleotide variations rely on short, accurate reads from second-generation sequencing devices. Presently, third-generation sequencing platforms are rapidly becoming more widespread, yet approaches for leveraging their long but error-prone reads for genotyping are lacking. Here, we introduce a novel statistical framework for the joint inference of haplotypes and genotypes from noisy long reads, which we term diplotyping. Our technique takes full advantage of linkage information provided by long reads. We validate hundreds of thousands of candidate variants that have not yet been included in the high-confidence reference set of the Genome-in-a-Bottle effort.

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