Evaluation of Hybridization Capture Versus Amplicon-Based Methods for Whole-Exome Sequencing

Area of Science:

• Genomics
• Molecular Biology
• Bioinformatics

Background:

• Next-generation sequencing (NGS) advances genomic variation characterization.
• Whole-exome sequencing (WES) is a cost-effective method for identifying phenotype-altering mutations.
• Exome enrichment strategies have evolved from hybridization capture to amplicon-based methods.

Purpose of the Study:

• To compare the performance of hybridization capture-based and amplicon-based WES methods.
• To evaluate on-target alignment, uniformity, and variant calling accuracy across different WES approaches.
• To guide laboratories in selecting optimal WES strategies.

Main Methods:

• Evaluation of two hybridization capture and two amplicon-based WES methods.
• Utilized both Illumina and Ion Torrent sequencing platforms.
• Assessed on-target rates, uniformity, single-nucleotide variant (SNV) and copy-number variant (CNV) calling.

Main Results:

• Amplicon-based methods showed higher on-target alignment rates.
• Hybridization capture methods exhibited superior uniformity.
• All methods detected common SNVs, but amplicon methods had unique discordant variants, potentially due to coverage or platform-specific algorithms.
• All methods showed effective CNV calling when compared to SNP arrays.

Conclusions:

• WES approaches differ in performance characteristics, impacting variant detection.
• Selecting appropriate variant calling algorithms is crucial and depends on the capture method used.
• This comparative study aids laboratories in choosing the most suitable WES strategy for their needs.