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Thursday, August 19, 2021

Infographic: A brief history of microbiology

Our understanding of microbiology has evolved enormously over the last 150 years. Few institutions have witnessed our collective progress more closely than the National Collection of Type Cultures (NCTC). In fact, the collection itself is a record of the many milestones microbiologists have crossed, building on the discoveries of those who came before. To date, 60% of NCTC’s historic collection now has a closed, finished reference genome, thanks to PacBio Single Molecule, Real- Time (SMRT) Sequencing. We are excited to be their partner in crossing this latest milestone on their quest to improve human and animal health by understanding the…

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Thursday, August 19, 2021

Case Study: Sequencing an historic bacterial collection for the future

The UK’s National Collection of Type Cultures (NCTC) is a unique collection of more than 5,000 expertly preserved and authenticated bacterial cultures, many of historical significance. Founded in 1920, NCTC is the longest established collection of its type anywhere in the world, with a history of its own that has reflected — and contributed to — the evolution of microbiology for more than 100 years.

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Tuesday, June 1, 2021

Genome sequencing of endosymbiotic bacterial Streptomyces sp. from Antartic lichen using Single Molecule Real-time Sequencing (SMRT) technology.

Along with the advent of next-generation sequencing (NGS) techniques, it has become possible to sequence a microbial genome very quickly with high coverage. Recently, PacificBioscience developed single molecule real-time sequencing (SMRT) technology, 3rd generation sequencing platform, which provide much longer (average read length: 1.5Kb) reads without PCR amplification. We did de novo sequencing of Streptomyces sp. using Illumina GAIIx, Roche 454 and PacBio RS system and compared the data. The endosymbiotic bacteria Streptomyces sp. PAMC 26508 was isolated from Antarctic lichen Psoroma sp. that grows attached rocks on Barton Peninsula, King George Island, Antarctica (62, 13’S, 58, 47’W). With 4…

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Tuesday, June 1, 2021

Advances in sequence consensus and clustering algorithms for effective de novo assembly and haplotyping applications.

One of the major applications of DNA sequencing technology is to bring together information that is distant in sequence space so that understanding genome structure and function becomes easier on a large scale. The Single Molecule Real Time (SMRT) Sequencing platform provides direct sequencing data that can span several thousand bases to tens of thousands of bases in a high-throughput fashion. In contrast to solving genomic puzzles by patching together smaller piece of information, long sequence reads can decrease potential computation complexity by reducing combinatorial factors significantly. We demonstrate algorithmic approaches to construct accurate consensus when the differences between reads…

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Tuesday, June 1, 2021

Complex alternative splicing patterns in hematopoietic cell subpopulations revealed by third-generation long reads.

Background: Alternative splicing expands the repertoire of gene functions and is a signature for different cell populations. Here we characterize the transcriptome of human bone marrow subpopulations including progenitor cells to understand their contribution to homeostasis and pathological conditions such as atherosclerosis and tumor metastasis. To obtain full-length transcript structures, we utilized long reads in addition to RNA-seq for estimating isoform diversity and abundance. Method: Freshly harvested, viable human bone marrow tissues were extracted from discarded harvesting equipment and separated into total bone marrow (total), lineage-negative (lin-) progenitor cells and differentiated cells (lin+) by magnetic bead sorting with antibodies to…

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Tuesday, June 1, 2021

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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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

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

“SMRTer Confirmation”: Scalable clinical read-through variant confirmation using the Pacific Biosciences SMRT Sequencing platform

Next-generation sequencing (NGS) has significantly improved the cost and turnaround time for diagnostic genetic tests. ACMG recommends variant confirmation by an orthogonal method, unless sufficiently high sensitivity and specificity can be demonstrated using NGS alone. Most NGS laboratories make extensive use of Sanger sequencing for secondary confirmation of single nucleotide variants (SNVs) and indels, representing a large fraction of the cost and time required to deliver high quality genetic testing data to clinicians and patients. Despite its established data quality, Sanger is not a high-throughput method by today’s standards from either an assay or analysis standpoint as it can involve…

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Friday, February 5, 2021

Podcast: Going beyond the $1,000 genome with Mark Gerstein

Mark Gerstein is the co-director of the Yale Computational Biology and Bioinformatics program where he focuses on better annotation of the human genome and better ways to mine big genomics data. He has played a big role in some of the large genomics initiatives since the first human genome project, including ENCODE and the 1,000 Genomes Project. “I’m very enthusiastic, of course, about the thousand dollar genome, but I don’t think that a true human genome has arrived for a thousand dollars,” Mark says at the outset of this Mendelspod interview. “The great excitement of next generation sequencing—which is deserved—has…

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Tuesday, April 21, 2020

Long-read sequencing for rare human genetic diseases.

During the past decade, the search for pathogenic mutations in rare human genetic diseases has involved huge efforts to sequence coding regions, or the entire genome, using massively parallel short-read sequencers. However, the approximate current diagnostic rate is

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