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Tuesday, June 1, 2021

Multiplexing strategies for microbial whole genome SMRT Sequencing

The increased throughput of the RS II and Sequel Systems enables multiple microbes to be sequenced on a single SMRT Cell. This multiplexing can be readily achieved by simply incorporating a unique barcode for each microbe into the SMRTbell adapters after shearing genomic DNA using a streamlined library construction process. Incorporating a barcode without the requirement for PCR amplification prevents the loss of epigenetic information (e.g., methylation signatures), and the generation of chimeric sequences, while the modified protocol eliminates the need to build several individual SMRTbell libraries. We multiplexed up to 8 unique strains of H. pylori. Each strain was…

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Tuesday, June 1, 2021

Candidate gene screening using long-read sequencing

We have developed several candidate gene screening applications for both Neuromuscular and Neurological disorders. The power behind these applications comes from the use of long-read sequencing. It allows us to access previously unresolvable and even unsequencable genomic regions. SMRT Sequencing offers uniform coverage, a lack of sequence context bias, and very high accuracy. In addition, it is also possible to directly detect epigenetic signatures and characterize full-length gene transcripts through assembly-free isoform sequencing. In addition to calling the bases, SMRT Sequencing uses the kinetic information from each nucleotide to distinguish between modified and native bases.

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Tuesday, June 1, 2021

Enrichment of unamplified DNA and long-read SMRT Sequencing to unlock repeat expansion disorders

Nucleotide repeat expansions are a major cause of neurological and neuromuscular disease in humans, however, the nature of these genomic regions makes characterizing them extremely challenging. Accurate DNA sequencing of repeat expansions using short-read sequencing technologies is difficult, as short-read technologies often cannot read through regions of low sequence complexity. Additionally, these short reads do not span the entire region of interest and therefore sequence assembly is required. Lastly, most target enrichment methods are reliant upon amplification which adds the additional caveat of PCR bias. We have developed a novel, amplification-free enrichment technique that employs the CRISPR/Cas9 system for specific…

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Tuesday, June 1, 2021

Targeted enrichment without amplification and SMRT Sequencing of repeat-expansion disease causative genomic regions

Targeted sequencing has proven to be an economical means of obtaining sequence information for one or more defined regions of a larger genome. However, most target enrichment methods are reliant upon some form of amplification. Amplification removes the epigenetic marks present in native DNA, and some genomic regions, such as those with extreme GC content and repetitive sequences, are recalcitrant to faithful amplification. Yet, a large number of genetic disorders are caused by expansions of repeat sequences. Furthermore, for some disorders, methylation status has been shown to be a key factor in the mechanism of disease. We have developed a…

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Tuesday, June 1, 2021

Amplification-free targeted enrichment and SMRT Sequencing of repeat-expansion genomic regions

Targeted sequencing has proven to be an economical means of obtaining sequence information for one or more defined regions of a larger genome. However, most target enrichment methods are reliant upon some form of amplification. Amplification removes the epigenetic marks present in native DNA, and some genomic regions, such as those with extreme GC content and repetitive sequences, are recalcitrant to faithful amplification. Yet, a large number of genetic disorders are caused by expansions of repeat sequences. Furthermore, for some disorders, methylation status has been shown to be a key factor in the mechanism of disease.

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Tuesday, June 1, 2021

Allelic specificity of immunoglobulin heavy chain (IGH@) translocation in B-cell acute lymphoblastic leukemia (B-ALL) unveiled by long-read sequencing

Oncogenic fusion of IGH-DUX4 has recently been reported as a hallmark that defines a B-ALL subtype present in up to 7% of adolescents and young adults B-ALL. The translocation of DUX4 into IGH results in aberrant activation of DUX4 by hijacking the intronic IGH enhancer (Eµ). How IGH-DUX4 translocation interplays with IGH allelic exclusion was never been explored. We investigated this in Nalm6 B-ALL cell line, using long-read (PacBio Iso-Seq method and 10X Chromium WGS), short-read (Illumina total stranded RNA and WGS), epigenome (H3K27ac ChIP-seq, ATAC-seq) and 3-D genome (Hi-C, H3K27ac HiChIP, Capture-C).

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Tuesday, June 1, 2021

Amplification-free, CRISPR-Cas9 targeted enrichment and SMRT Sequencing of repeat-expansion disease causative genomic regions

Targeted sequencing has proven to be economical for obtaining sequence information for defined regions of the genome. However, most target enrichment methods are reliant upon some form of amplification which can negatively impact downstream analysis. For example, amplification removes epigenetic marks present in native DNA, including nucleotide methylation, which are hypothesized to contribute to disease mechanisms in some disorders. In addition, some genomic regions known to be causative of many genetic disorders have extreme GC content and/or repetitive sequences that tend to be recalcitrant to faithful amplification. We have developed a novel, amplification-free enrichment technique that employs the CRISPR/Cas9 system…

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Wednesday, March 24, 2021

AGBT Presentation: Increasing the Solve Rate of Rare and Undiagnosed Genetic Diseases with HiFi Sequencing

In this talk, Jonas Korlach, PhD, Chief Scientific Officer at PacBio describes how using PacBio HiFi reads, which are greater than 99.9% accurate and up to 25 kb long, led to the detection of structural variants in examples of previously unexplained rare genetic diseases. Genetic diseases affect as much as 10% of the population and over 50% of cases currently remain unexplained. Similarly, Mendelian diseases include over 8,500 described disorders, however at present ~40% have an unknown genetic cause. In addition, he highlights the strength of complete, phased, high-accuracy human WGS for simultaneously yielding high-quality information about any other locus…

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