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June 22, 2017

Case Study: SMRT sequencing brings clarity to HIV vaccine and transplant research at the Wisconsin national primate research center

The Wisconsin National Primate Research Center (WNPRC) is a leading Major Histocompatibility Complex (MHC) typing lab that focuses on monkeys. While many scientists are familiar with the importance of characterizing the histocompatibility region of the human genome for applications like disease research or tissue typing before organ transplantation, fewer are aware of the need to accurately type this region in non-human primates. At the primate research lab, part of the University of Wisconsin- Madison, scientists are analyzing immune regions to help test potential HIV vaccines and AIDS therapies. Their work is essential for understanding the effects of treatment ahead of…

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March 3, 2017

Characterization of the dynamic transcriptome of a herpesvirus with long-read Single Molecule Real-Time Sequencing.

Herpesvirus gene expression is co-ordinately regulated and sequentially ordered during productive infection. The viral genes can be classified into three distinct kinetic groups: immediate-early, early, and late classes. In this study, a massively parallel sequencing technique that is based on PacBio Single Molecule Real-time sequencing platform, was used for quantifying the poly(A) fraction of the lytic transcriptome of pseudorabies virus (PRV) throughout a 12-hour interval of productive infection on PK-15 cells. Other approaches, including microarray, real-time RT-PCR and Illumina sequencing are capable of detecting only the aggregate transcriptional activity of particular genomic regions, but not individual herpesvirus transcripts. However, SMRT…

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December 1, 2015

No assembly required: Full-length MHC class I allele discovery by PacBio circular consensus sequencing.

Single-molecule real-time (SMRT) sequencing technology with the Pacific Biosciences (PacBio) RS II platform offers the potential to obtain full-length coding regions (~1100-bp) from MHC class I cDNAs. Despite the relatively high error rate associated with SMRT technology, high quality sequences can be obtained by circular consensus sequencing (CCS) due to the random nature of the error profile. In the present study we first validated the ability of SMRT-CCS to accurately identify class I transcripts in Mauritian-origin cynomolgus macaques (Macaca fascicularis) that have been characterized previously by cloning and Sanger-based sequencing as well as pyrosequencing approaches. We then applied this SMRT-CCS…

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October 22, 2014

Targeted combinatorial alternative splicing generates brain region-specific repertoires of neurexins.

Molecular diversity of surface receptors has been hypothesized to provide a mechanism for selective synaptic connectivity. Neurexins are highly diversified receptors that drive the morphological and functional differentiation of synapses. Using a single cDNA sequencing approach, we detected 1,364 unique neurexin-a and 37 neurexin-ß mRNAs produced by alternative splicing of neurexin pre-mRNAs. This molecular diversity results from near-exhaustive combinatorial use of alternative splice insertions in Nrxn1a and Nrxn2a. By contrast, Nrxn3a exhibits several highly stereotyped exon selections that incorporate novel elements for posttranscriptional regulation of a subset of transcripts. Complexity of Nrxn1a repertoires correlates with the cellular complexity of neuronal…

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