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Optimization of next-generation sequencing technologies for von Hippel Lindau (VHL) mosaic mutation detection and development of confirmation methods.

07:00 EST 4th February 2019 | BioPortfolio

Summary of "Optimization of next-generation sequencing technologies for von Hippel Lindau (VHL) mosaic mutation detection and development of confirmation methods."

Von Hippel Lindau disease (VHL) is a monogenic disorder characterized by the development of tumors affecting the central nervous system, kidney, pancreas, or adrenal glands, and due to germline mutations in the VHL tumor suppressor gene. About 5% of patients harboring a typical VHL phenotype have no mutation detected by conventional techniques, so a postzygotic VHL mosaicism can be suspected. The aim of this study was therefore to implement a next-generation sequencing (NGS) strategy for VHL mosaic mutation detection, including an optimization of the original Personal Genome Machine design by enrichment with oligonucleotides corresponding to amplicons with insufficient depth of coverage. Two complementary strategies were developed for the confirmation of mosaic mutations identified by NGS, SNaPshot for variants present at an allelic ratio greater than 5%, and droplet digital PCR for allelic ratio above 1%. VHL mutant plasmids were generated to assess VHL mosaic mutation detection in different exons and to set up an internal quality control that could be included in each run or regularly to validate the assay. This strategy was applied to 47 patients with a suggestive or clinical VHL disease and mosaic mutations were identified in 8.5% of patients. In conclusion, NGS technologies combined with SNaPshot or droplet digital PCR allow the detection and confirmation of mosaic mutations in a clinical laboratory setting.

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Name: The Journal of molecular diagnostics : JMD
ISSN: 1943-7811
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Medical and Biotech [MESH] Definitions

A ubiquitin-protein ligase that mediates OXYGEN-dependent polyubiquitination of HYPOXIA-INDUCIBLE FACTOR 1, ALPHA SUBUNIT. It is inactivated in VON HIPPEL-LINDAU SYNDROME.

An autosomal dominant disorder caused by mutations in a tumor suppressor gene. This syndrome is characterized by abnormal growth of small blood vessels leading to a host of neoplasms. They include HEMANGIOBLASTOMA in the RETINA; CEREBELLUM; and SPINAL CORD; PHEOCHROMOCYTOMA; pancreatic tumors; and renal cell carcinoma (see CARCINOMA, RENAL CELL). Common clinical signs include HYPERTENSION and neurological dysfunctions.

A benign tumor of the nervous system that may occur sporadically or in association with VON HIPPEL-LINDAU DISEASE. It accounts for approximately 2% of intracranial tumors, arising most frequently in the cerebellar hemispheres and vermis. Histologically, the tumors are composed of multiple capillary and sinusoidal channels lined with endothelial cells and clusters of lipid-laden pseudoxanthoma cells. Usually solitary, these tumors can be multiple and may also occur in the brain stem, spinal cord, retina, and supratentorial compartment. Cerebellar hemangioblastomas usually present in the third decade with INTRACRANIAL HYPERTENSION, and ataxia. (From DeVita et al., Cancer: Principles and Practice of Oncology, 5th ed, pp2071-2)

The type species of TOBAMOVIRUS which causes mosaic disease of tobacco. Transmission occurs by mechanical inoculation.

A unit of the National Institutes of Health that seeks to catalyze the generation of innovative methods and technologies that will enhance the development, testing, and implementation of diagnostics and therapeutics across a wide range of human diseases and conditions. The Center was established in 2011.

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