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Target Enrichment Approaches for Next-Generation Sequencing Applications in Oncology

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DIAGNOSTICS
卷 12, 期 7, 页码 -

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MDPI
DOI: 10.3390/diagnostics12071539

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next-generation sequencing; NGS; target enrichment; polymerase chain reaction; amplicon; hybridization capture

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Screening for genomic sequence variants is crucial in precision medicine and next-generation sequencing technologies have become the preferred platforms due to their capacity for massively parallel sequencing. Targeted NGS workflow involves enrichment of the regions of interest, improving the accuracy and cost-effectiveness of screening.
Screening for genomic sequence variants in genes of predictive and prognostic significance is an integral part of precision medicine. Next-generation sequencing (NGS) technologies are progressively becoming platforms of choice to facilitate this, owing to their massively parallel sequencing capability, which can be used to simultaneously screen multiple markers in multiple samples for a variety of variants (single nucleotide and multi nucleotide variants, insertions and deletions, gene copy number variations, and fusions). A crucial step in the workflow of targeted NGS is the enrichment of the genomic regions of interest to be sequenced, against the whole genomic background. This ensures that the NGS effort is focused to predominantly screen target regions of interest with minimal off-target sequencing, making it more accurate and economical. Polymerase chain reaction-based (PCR, or amplicon-based) and hybridization capture-based methodologies are the two prominent approaches employed for target enrichment. This review summarizes the basic principles of target enrichment utilized by these methods, their multiple variations that have evolved over time, automation approaches, overall comparison of their advantages and drawbacks, and commercially available choices for these methodologies.

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