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Tuesday, April 21, 2020

Genetic Variation, Comparative Genomics, and the Diagnosis of Disease.

The discovery of mutations associated with human genetic dis- ease is an exercise in comparative genomics (see Glossary). Although there are many different strategies and approaches, the central premise is that affected persons harbor a significant excess of pathogenic DNA variants as com- pared with a group of unaffected persons (controls) that is either clinically defined1 or established by surveying large swaths of the general population.2 The more exclu- sive the variant is to the disease, the greater its penetrance, the larger its effect size, and the more relevant it becomes to both disease diagnosis and future therapeutic investigation. The…

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Tuesday, April 21, 2020

Long-read sequencing identified intronic repeat expansions in SAMD12 from Chinese pedigrees affected with familial cortical myoclonic tremor with epilepsy.

The locus for familial cortical myoclonic tremor with epilepsy (FCMTE) has long been mapped to 8q24 in linkage studies, but the causative mutations remain unclear. Recently, expansions of intronic TTTCA and TTTTA repeat motifs within SAMD12 were found to be involved in the pathogenesis of FCMTE in Japanese pedigrees. We aim to identify the causative mutations of FCMTE in Chinese pedigrees.We performed genetic linkage analysis by microsatellite markers in a five-generation Chinese pedigree with 55 members. We also used array-comparative genomic hybridisation (CGH) and next-generation sequencing (NGS) technologies (whole-exome sequencing, capture region deep sequencing and whole-genome sequencing) to identify the…

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Tuesday, April 21, 2020

Multi-platform discovery of haplotype-resolved structural variation in human genomes.

The incomplete identification of structural variants (SVs) from whole-genome sequencing data limits studies of human genetic diversity and disease association. Here, we apply a suite of long-read, short-read, strand-specific sequencing technologies, optical mapping, and variant discovery algorithms to comprehensively analyze three trios to define the full spectrum of human genetic variation in a haplotype-resolved manner. We identify 818,054 indel variants (

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Tuesday, April 21, 2020

Long-Read Sequencing Emerging in Medical Genetics

The wide implementation of next-generation sequencing (NGS) technologies has revolutionized the field of medical genetics. However, the short read lengths of currently used sequencing approaches pose a limitation for identification of structural variants, sequencing repetitive regions, phasing alleles and distinguishing highly homologous genomic regions. These limitations may significantly contribute to the diagnostic gap in patients with genetic disorders who have undergone standard NGS, like whole exome or even genome sequencing. Now, the emerging long-read sequencing (LRS) technologies may offer improvements in the characterization of genetic variation and regions that are difficult to assess with the currently prevailing NGS approaches. LRS…

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Monday, March 30, 2020

ASHG PacBio Workshop: Medical diagnostic challenges and structural variation detection using the PacBio Platform

Richard Gibbs, Director of Baylor College of Medicine’s Human Genome Sequencing Center, talked about the transition to genomic medicine. This hasn’t been as simple as people would like due to such issues as the incomplete reference genome, the difficulty in characterizing some variation, and the lack of knowledge about the function of some genes. At Baylor, most of the human genome sequencing is done for children with Mendelian disorders. He said that among 7,000 samples processed using short-read exome sequencing, only about 25% of these cases are solved. The relatively low diagnosis rate is likely due to structural variation and…

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Monday, March 30, 2020

Podcast: Exploring the exome and the future of genomics with Jay Shendure

Jay Shendure, a Professor in the Department of Genome Sciences at the University of Washington School of Medicine explores the role of exome sequencing in clinical genomics. In this Podcast he discusses his views on the current and future roles of sequencing in diagnosing Mendelian disorders and investigation of complex regions of the genome.

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