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Thursday, August 19, 2021

Whitepaper: Structural variation in the human genome

Structural variation accounts for much of the variation among human genomes. Structural variants of all types are known to cause Mendelian disease and contribute to complex disease. Learn how long-read sequencing is enabling detection of the full spectrum of structural variants to advance the study of human disease, evolution and genetic diversity.

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Thursday, August 19, 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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Tuesday, June 1, 2021

Integrative biology of a fungus: Using PacBio SMRT Sequencing to interrogate the genome, epigenome, and transcriptome of Neurospora crassa.

PacBio SMRT Sequencing has the unique ability to directly detect base modifications in addition to the nucleotide sequence of DNA. Because eukaryotes use base modifications to regulate gene expression, the absence or presence of epigenetic events relative to the location of genes is critical to elucidate the function of the modification. Therefore an integrated approach that combines multiple omic-scale assays is necessary to study complex organisms. Here, we present an integrated analysis of three sequencing experiments: 1) DNA sequencing, 2) base-modification detection, and 3) Iso-seq analysis, in Neurospora crassa, a filamentous fungus that has been used to make many landmark…

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Tuesday, June 1, 2021

High-throughput analysis of full-length proviral HIV-1 genomes from PBMCs.

Background: HIV-1 proviruses in peripheral blood mononuclear cells (PBMCs) are felt to be an important reservoir of HIV-1 infection. Given that this pool represents an archival library, it can be used to study virus evolution and CD4+ T cell survival. Accurate study of this pool is burdened by difficulties encountered in sequencing a full-length proviral genome, typically accomplished by assembling overlapping pieces and imputing the full genome. Methodology: Cryopreserved PBMCs collected from a total of 8 HIV+ patients from 1997-2001 were used for genomic DNA extraction. Patients had been receiving cART for 2-8 years at the time samples were obtained.…

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Tuesday, June 1, 2021

Resources for advanced bioinformaticians working in plant and animal genomes with SMRT Sequencing.

Significant advances in bioinformatics tool development have been made to more efficiently leverage and deliver high-quality genome assemblies with PacBio long-read data. Current data throughput of SMRT Sequencing delivers average read lengths ranging from 10-15 kb with the longest reads exceeding 40 kb. This has resulted in consistent demonstration of a minimum 10-fold improvement in genome assemblies with contig N50 in the megabase range compared to assemblies generated using only short- read technologies. This poster highlights recent advances and resources available for advanced bioinformaticians and developers interested in the current state-of-the-art large genome solutions available as open-source code from PacBio…

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Tuesday, June 1, 2021

Highly sensitive and cost-effective detection of BRCA1 and BRCA2 cancer variants in FFPE samples using Multiplicom’s MASTR technology & Single Molecule, Real-Time (SMRT) Sequencing

Specific mutations in BRCA1 and BRCA2 have been shown to be associated with several types of cancers. Molecular profiling of cancer samples requires assays capable of accurately detecting the entire spectrum of variants, including those at relatively low frequency. Next-Generation Sequencing (NGS) has been a powerful tool for researchers to better understand cancer genetics. Here we describe a targeted re-sequencing workflow that combines barcoded amplification of BRCA1 and BRCA2 exons from 12 FFPE tumor samples using Multiplicom’s MASTR technology with PacBio SMRT Sequencing. This combination allows for the accurate detection of variants in a cost-effective and timely manner.

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Tuesday, June 1, 2021

SMRT Sequencing of the alala genome

Single Molecule Real-Time (SMRT) Sequencing was used to generate long reads for whole genome shotgun sequencing of the genome of the`alala (Hawaiian crow). The ‘alala is endemic to Hawaii, and the only surviving lineage of the crow family, Corvidae, in the Hawaiian Islands. The population declined to less than 20 individuals in the 1990s, and today this charismatic species is extinct in the wild. Currently existing in only two captive breeding facilities, reintroduction of the ‘alala is scheduled to begin in the Fall of 2016. Reintroduction efforts will be assisted by information from the ‘alala genome generated and assembled by…

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Tuesday, June 1, 2021

Targeted sequencing of genes from soybean using NimbleGen SeqCap EZ and PacBio SMRT Sequencing

Full-length gene capture solutions offer opportunities to screen and characterize structural variations and genetic diversity to understand key traits in plants and animals. Through a combined Roche NimbleGen probe capture and SMRT Sequencing strategy, we demonstrate the capability to resolve complex gene structures often observed in plant defense and developmental genes spanning multiple kilobases. The custom panel includes members of the WRKY plant-defense-signaling family, members of the NB-LRR disease-resistance family, and developmental genes important for flowering. The presence of repetitive structures and low-complexity regions makes short-read sequencing of these genes difficult, yet this approach allows researchers to obtain complete sequences…

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Tuesday, June 1, 2021

Minimization of chimera formation and substitution errors in full-length 16S PCR amplification

The constituents and intra-communal interactions of microbial populations have garnered increasing interest in areas such as water remediation, agriculture and human health. Amplification and sequencing of the evolutionarily conserved 16S rRNA gene is an efficient method of profiling communities. Currently, most targeted amplification focuses on short, hypervariable regions of the 16S sequence. Distinguishing information not spanned by the targeted region is lost, and species-level classification is often not possible. PacBio SMRT Sequencing easily spans the entire 1.5 kb 16S gene in a single read, producing highly accurate single-molecule sequences that can improve the identification of individual species in a metapopulation.However,…

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Tuesday, June 1, 2021

Multiplex target enrichment using barcoded multi-kilobase fragments and probe-based capture technologies

Target enrichment capture methods allow scientists to rapidly interrogate important genomic regions of interest for variant discovery, including SNPs, gene isoforms, and structural variation. Custom targeted sequencing panels are important for characterizing heterogeneous, complex diseases and uncovering the genetic basis of inherited traits with more uniform coverage when compared to PCR-based strategies. With the increasing availability of high-quality reference genomes, customized gene panels are readily designed with high specificity to capture genomic regions of interest, thus enabling scientists to expand their research scope from a single individual to larger cohort studies or population-wide investigations. Coupled with PacBio® long-read sequencing, these…

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Tuesday, June 1, 2021

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, June 1, 2021

Target enrichment using a neurology panel for 12 barcoded genomic DNA samples on the PacBio SMRT Sequencing platform

Target enrichment is a powerful tool for studies involved in understanding polymorphic SNPs with phasing, tandem repeats, and structural variations. With increasing availability of reference genomes, researchers can easily design a cost-effective targeted investigation with custom probes specific to regions of interest. Using PacBio long-read technology in conjunction with probe capture, we were able to sequence multi-kilobase enriched regions to fully investigate intronic and exonic regions, distinguish haplotypes, and characterize structural variations. Furthermore, we demonstrate this approach is advantageous for studying complex genomic regions previously inaccessible through other sequencing platforms. In the present work, 12 barcoded genomic DNA (gDNA) samples…

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Tuesday, June 1, 2021

Assessing diversity and clonal variation of Australia’s grapevine germplasm: Curating the FALCON-Unzip Chardonnay de novo genome assembly

Until recently only two genome assemblies were publicly available for grapevine—both Vitis vinifera L. Cv. Pinot Noir (PN). The best available PN genome assembly (Jaillon et al. 2007) is not representative of the genome complexity that is typical of wine-grape cultivars in the field and it is highly fragmented. To assess the genetic complexities of Chardonnay grapevine, assembly of a new de novo reference genome was needed. Here we describe a draft assembly using PacBio SMRT Sequencing data and PacBio’s new phased diploid genome assembler FALCON-Unzip (Chin et al. 2016).

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Tuesday, June 1, 2021

Screening and characterization of causative structural variants for bipolar disorder in a significantly linked chromosomal region onXq24-q27 in an extended pedigree from a genetic isolate

Bipolar disorder (BD) is a phenotypically and genetically complex and debilitating neurological disorder that affects 1% of the worldwide population. There is compelling evidence from family, twin and adoption studies supporting the involvement of a genetic predisposition in BD with estimated heritability up to ~ 80%. The risk in first-degree relatives is ten times higher than in the general population. Linkage and association studies have implicated multiple putative chromosomal loci for BP susceptibility, however no disease genes have been identified to date.

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Tuesday, June 1, 2021

SMRT Sequencing of full-length androgen receptor isoforms in prostate cancer reveals previously hidden drug resistant variants

Prostate cancer is the most frequently diagnosed male cancer. For prostate cancer that has progressed to an advanced or metastatic stage, androgen deprivation therapy (ADT) is the standard of care. ADT inhibits activity of the androgen receptor (AR), a master regulator transcription factor in normal and cancerous prostate cells. The major limitation of ADT is the development of castration-resistant prostate cancer (CRPC), which is almost invariably due to transcriptional re-activation of the AR. One mechanism of AR transcriptional re-activation is expression of AR-V7, a truncated, constitutively active AR variant (AR-V) arising from alternative AR pre-mRNA splicing. Noteworthy, AR-V7 is being…

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