Validation of an Expanded Carrier Screen that Optimizes Sensitivity via Full-Exon Sequencing and Panel-wide Copy Number Variant Identification

By identifying pathogenic variants across hundreds of genes, expanded carrier screening (ECS) enables prospective parents to assess the risk of transmitting an autosomal recessive or X-linked condition. Detection of at-risk couples depends on the number of conditions tested, the prevalence of the re...

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Veröffentlicht in:Clinical chemistry (Baltimore, Md.) Md.), 2018-07, Vol.64 (7), p.1063-1073
Hauptverfasser: Hogan, Gregory J, Vysotskaia, Valentina S, Beauchamp, Kyle A, Seisenberger, Stefanie, Grauman, Peter V, Haas, Kevin R, Hong, Sun Hae, Jeon, Diana, Kash, Shera, Lai, Henry H, Melroy, Laura M, Theilmann, Mark R, Chu, Clement S, Iori, Kevin, Maguire, Jared R, Evans, Eric A, Haque, Imran S, Mar-Heyming, Rebecca, Kang, Hyunseok P, Muzzey, Dale
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container_issue 7
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container_title Clinical chemistry (Baltimore, Md.)
container_volume 64
creator Hogan, Gregory J
Vysotskaia, Valentina S
Beauchamp, Kyle A
Seisenberger, Stefanie
Grauman, Peter V
Haas, Kevin R
Hong, Sun Hae
Jeon, Diana
Kash, Shera
Lai, Henry H
Melroy, Laura M
Theilmann, Mark R
Chu, Clement S
Iori, Kevin
Maguire, Jared R
Evans, Eric A
Haque, Imran S
Mar-Heyming, Rebecca
Kang, Hyunseok P
Muzzey, Dale
description By identifying pathogenic variants across hundreds of genes, expanded carrier screening (ECS) enables prospective parents to assess the risk of transmitting an autosomal recessive or X-linked condition. Detection of at-risk couples depends on the number of conditions tested, the prevalence of the respective diseases, and the screen's analytical sensitivity for identifying disease-causing variants. Disease-level analytical sensitivity is often
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Detection of at-risk couples depends on the number of conditions tested, the prevalence of the respective diseases, and the screen's analytical sensitivity for identifying disease-causing variants. Disease-level analytical sensitivity is often &lt;100% in ECS tests because copy number variants (CNVs) are typically not interrogated because of their technical complexity. We present an analytical validation and preliminary clinical characterization of a 235-gene sequencing-based ECS with full coverage across coding regions, targeted assessment of pathogenic noncoding variants, panel-wide CNV calling, and specialized assays for technically challenging genes. Next-generation sequencing, customized bioinformatics, and expert manual call review were used to identify single-nucleotide variants, short insertions and deletions, and CNVs for all genes except and those whose low disease incidence or high technical complexity precluded novel variant identification or interpretation. Screening of 36859 patients' blood or saliva samples revealed the substantial impact on fetal disease-risk detection attributable to novel CNVs (9.19% of risk) and technically challenging conditions (20.2% of risk), such as congenital adrenal hyperplasia. Of the 7498 couples screened, 335 were identified as at risk for an affected pregnancy, underscoring the clinical importance of the test. Validation of our ECS demonstrated &gt;99% analytical sensitivity and &gt;99% analytical specificity. 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source Oxford University Press Journals All Titles (1996-Current)
subjects Bioinformatics
Complexity
Congenital diseases
Copy number
Cystic fibrosis
Disease
Fetuses
FMR1 protein
Gene sequencing
Genes
Genetic screening
Genetics
Genomes
Genomics
Haplotypes
Hyperplasia
Identification
Laboratories
Mathematical analysis
Molecular chains
Parents
Pregnancy
Risk assessment
Saliva
Screening
Sensitivity analysis
title Validation of an Expanded Carrier Screen that Optimizes Sensitivity via Full-Exon Sequencing and Panel-wide Copy Number Variant Identification
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