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Wednesday, February 26, 2020

Structural variant in the RNA Binding Motif Protein, X-Linked 2 (RBMX2) gene found to be linked to bipolar disorder

Bipolar disorder (BD) is a phenotypically and genetically complex 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 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 BD susceptibility, however no disease genes have yet to be identified. Here, we have fully characterized a ~12 Mb significantly linked (lod score=3.54) genomic region on chromosome Xq24-q27 in an extended family from…

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Wednesday, February 26, 2020

Targeted SMRT Sequencing and phasing using Roche NimbleGen’s SeqCap EZ enrichment

As a cost-effective alternative to whole genome human sequencing, targeted sequencing of specific regions, such as exomes or panels of relevant genes, has become increasingly common. These methods typically include direct PCR amplification of the genomic DNA of interest, or the capture of these targets via probe-based hybridization. Commonly, these approaches are designed to amplify or capture exonic regions and thereby result in amplicons or fragments that are a few hundred base pairs in length, a length that is well-addressed with short-read sequencing technologies. These approaches typically provide very good coverage and can identify SNPs in the targeted region, but…

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Wednesday, February 26, 2020

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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Wednesday, February 26, 2020

Application specific barcoding strategies for SMRT Sequencing

Over the last few years, several advances were implemented in the PacBio RS II System to maximize throughput and efficiency while reducing the cost per sample. The number of useable bases per SMRT Cell now exceeds 1 Gb with the latest P6-C4 chemistry and 6-hour movies. For applications such as microbial sequencing, targeted sequencing, Iso-Seq (full-length isoform sequencing) and Nimblegen’s target enrichment method, current SMRT Cell yields could be an excess relative to project requirements. To this end, barcoding is a viable option for multiplexing samples. For microbial sequencing, multiplexing can be accomplished by tagging sheared genomic DNA during library…

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Wednesday, February 26, 2020

Immune regions are no longer incomprehensible with SMRT Sequencing

The complex immune regions of the genome, including MHC and KIR, contain large copy number variants (CNVs), a high density of genes, hyper-polymorphic gene alleles, and conserved extended haplotypes (CEH) with enormous linkage disequilibrium (LDs). This level of complexity and inherent biases of short-read sequencing make it challenging for extracting immune region haplotype information from reference-reliant, shotgun sequencing and GWAS methods. As NGS based genome and exome sequencing and SNP arrays have become a routine for population studies, numerous efforts are being made for developing software to extract and or impute the immune gene information from these datasets. Despite these…

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Wednesday, February 26, 2020

Highly contiguous de novo human genome assembly and long-range haplotype phasing using SMRT Sequencing

The long reads, random error, and unbiased sampling of SMRT Sequencing enables high quality, de novo assembly of the human genome. PacBio long reads are capable of resolving genomic variations at all size scales, including SNPs, insertions, deletions, inversions, translocations, and repeat expansions, all of which are important in understanding the genetic basis for human disease and difficult to access via other technologies. In demonstration of this, we report a new high-quality, diploid aware de novo assembly of Craig Venter’s well-studied genome.

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Wednesday, February 26, 2020

Application-specific barcoding strategies for SMRT Sequencing

The increased sequencing throughput creates a need for multiplexing for several applications. We are here detailing different barcoding strategies for microbial sequencing, targeted sequencing, Iso-Seq full-length isoform sequencing, and Roche NimbleGen’s target enrichment method.

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Wednesday, February 26, 2020

Highly contiguous de novo human genome assembly and long-range haplotype phasing using SMRT Sequencing

The long reads, random error, and unbiased sampling of SMRT Sequencing enables high quality, de novo assembly of the human genome. PacBio long reads are capable of resolving genomic variations at all size scales, including SNPs, insertions, deletions, inversions, translocations, and repeat expansions, all of which are both important in understanding the genetic basis for human disease, and difficult to access via other technologies. In demonstration of this, we report a new high-quality, diploid-aware de novo assembly of Craig Venter’s well-studied genome.

Read More »

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