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Thursday, August 27, 2020

Immunology Brochure: Invaluable insights into immunology

In order to understand the molecular mechanisms governing the outcomes of disease, health and survival, immunologists have to characterize exceptionally complex genomic regions, like major histocompatibility complex (MHC), killer cell immune receptors (KIR), and the B and T-cell immune repertoire. Single Molecule, Real-Time (SMRT) Sequencing delivers the long read lengths, uniform coverage and high accuracy necessary to comprehensively and confidently resolve these immune sub-genomic regions. The granularity of data generated by PacBio® reads provides new access to imputation-free characterization of genes and haplotypes for invaluable genomic insights to advance disease association and evolutionary research.

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Wednesday, May 13, 2020

Webinar: Understanding SARS-CoV-2 and host immune response to COVID-19 with PacBio sequencing

Studying microbial genomics and infectious disease? Learn how the PacBio Sequel II System can help advance your research, with first-hand perspectives from scientists who are investigating SARS-CoV-2 and COVID-19. In this webinar, Melissa Laird-Smith (Mt. Sinai School of Medicine) discusses her work evaluating the impact of host immune restriction in health and disease with high resolution HLA typing. She is joined by Corey Watson (University of Louisville School of Medicine) who talks about overcoming complexity to elucidate the role of IGH haplotype diversity in antibody-mediated immunity. Hosted by Meredith Ashby, Director of Microbial Genomics at PacBio. Access additional PacBio resources…

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Tuesday, April 21, 2020

A Highly Unusual V1 Region of Env in an Elite Controller of HIV Infection.

HIV elite controllers represent a remarkable minority of patients who maintain normal CD4+ T-cell counts and low or undetectable viral loads for decades in the absence of antiretroviral therapy. To examine the possible contribution of virus attenuation to elite control, we obtained a primary HIV-1 isolate from an elite controller who had been infected for 19?years, the last 10 of which were in the absence of antiretroviral therapy. Full-length sequencing of this isolate revealed a highly unusual V1 domain in Envelope (Env). The V1 domain in this HIV-1 strain was 49 amino acids, placing it in the top 1% of…

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Tuesday, April 21, 2020

Immunogenetic factors driving formation of ultralong VH CDR3 in Bos taurus antibodies.

The antibody repertoire of Bos taurus is characterized by a subset of variable heavy (VH) chain regions with ultralong third complementarity determining regions (CDR3) which, compared to other species, can provide a potent response to challenging antigens like HIV env. These unusual CDR3 can range to over seventy highly diverse amino acids in length and form unique ß-ribbon ‘stalk’ and disulfide bonded ‘knob’ structures, far from the typical antigen binding site. The genetic components and processes for forming these unusual cattle antibody VH CDR3 are not well understood. Here we analyze sequences of Bos taurus antibody VH domains and find…

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Tuesday, April 21, 2020

Long-read sequencing unveils IGH-DUX4 translocation into the silenced IGH allele in B-cell acute lymphoblastic leukemia.

IGH@ proto-oncogene translocation is a common oncogenic event in lymphoid lineage cancers such as B-ALL, lymphoma and multiple myeloma. Here, to investigate the interplay between IGH@ proto-oncogene translocation and IGH allelic exclusion, we perform long-read whole-genome and transcriptome sequencing along with epigenetic and 3D genome profiling of Nalm6, an IGH-DUX4 positive B-ALL cell line. We detect significant allelic imbalance on the wild-type over the IGH-DUX4 haplotype in expression and epigenetic data, showing IGH-DUX4 translocation occurs on the silenced IGH allele. In vitro, this reduces the oncogenic stress of DUX4 high-level expression. Moreover, patient samples of IGH-DUX4 B-ALL have similar expression…

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Wednesday, February 26, 2020

Characterizing haplotype diversity at the immunoglobulin heavy chain locus across human populations using novel long-read sequencing and assembly approaches

The human immunoglobulin heavy chain locus (IGH) remains among the most understudied regions of the human genome. Recent efforts have shown that haplotype diversity within IGH is elevated and exhibits population specific patterns; for example, our re-sequencing of the locus from only a single chromosome uncovered >100 Kb of novel sequence, including descriptions of six novel alleles, and four previously unmapped genes. Historically, this complex locus architecture has hindered the characterization of IGH germline single nucleotide, copy number, and structural variants (SNVs; CNVs; SVs), and as a result, there remains little known about the role of IGH polymorphisms in inter-individual…

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