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October 17, 2019

TLA & long-read sequencing: Efficient targeted sequencing and phasing of the CFTR gene

Background: The sequencing and haplotype phasing of entire gene sequences improves the understanding of the genetic basis of disease and drug response. One example is cystic fibrosis (CF). Cystic fibrosis transmembrane conductance regulator (CFTR) modulator therapies have revolutionized CF treatment, but only in a minority of CF subjects. Observed heterogeneity in CFTR modulator efficacy is related to the range of CFTR mutations; revertant mutations can modify the response to CFTR modulators, and other intronic variations in the ~200 kb CFTR gene have been linked to disease severity. Heterogeneity in the CFTR gene may also be linked to differential responses to…

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October 17, 2019

The value of long read amplicon sequencing for clinical applications

NGS is commonly used for amplicon sequencing in clinical applications to study genetic disorders and detect disease-causing mutations. This approach can be plagued by limited ability to phase sequence variants and makes interpretation of sequence data difficult when pseudogenes are present. Long-read highly accurate amplicon sequencing can provide very accurate, efficient, high throughput (through multiplexing) sequences from single molecules, with read lengths largely limited by PCR. Data is easy to interpret; phased variants and breakpoints are present within high fidelity individual reads. Here we show SMRT Sequencing of the PMS2 and OPN1 (MW and LW) genes using the Sequel System.…

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September 23, 2019

Application Brief: No-Amp targeted sequencing – Best Practices

With the PacBio no-amplification (No-Amp) targeted sequencing method, you can now sequence through previously inaccessible regions of the genome to provide base-level resolution of disease-causing repeat expansions. By combining the CRISPR/Cas9 enrichment method with Single Molecule, Real-Time (SMRT) Sequencing on the Sequel Systems you are no longer limited by hard-to-amplify targets.

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September 5, 2019

Sequencing the previously unsequenceable using amplification-free targeted enrichment powered by CRISPR/Cas9

Genomic regions with extreme base composition bias and repetitive sequences have long proven challenging for targeted enrichment methods, as they rely upon some form of amplification. Similarly, most DNA sequencing technologies struggle to faithfully sequence regions of low complexity. This has especially been true for repeat expansion disorders such as Fragile X syndrome, Huntington’s disease and various Ataxias, where the repetitive elements range from several hundreds of bases to tens of kilobases. We have developed a robust, amplification-free targeted enrichment technique, called No-Amp Targeted Sequencing, that employs the CRISPR/Cas9 system. In conjunction with Single Molecule, Real-Time (SMRT) Sequencing, which delivers…

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September 1, 2019

µLAS technology for DNA isolation coupled to Cas9-assisted targeting for sequencing and assembly of a 30 kb region in plant genome.

Cas9-assisted targeting of DNA fragments in complex genomes is viewed as an essential strategy to obtain high-quality and continuous sequence data. However, the purity of target loci selected by pulsed-field gel electrophoresis (PFGE) has so far been insufficient to assemble the sequence in one contig. Here, we describe the µLAS technology to capture and purify high molecular weight DNA. First, the technology is optimized to perform high sensitivity DNA profiling with a limit of detection of 20 fg/µl for 50 kb fragments and an analytical time of 50 min. Then, µLAS is operated to isolate a 31.5 kb locus cleaved…

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