Clinical sequencing: is WGS the better WES?

Area of Science:

• Genomics
• Molecular Biology
• Clinical Diagnostics

Background:

• Clinical next-generation sequencing commonly utilizes gene panels and exome analysis.
• These methods rely on selective capturing of target DNA regions.
• Current capturing techniques exhibit limitations in fully covering coding exons, particularly GC-rich areas.

Purpose of the Study:

• To compare the coverage efficacy of whole exome sequencing (WES) with PCR-free whole genome sequencing (WGS).
• To evaluate the suitability of WGS for comprehensive genomic testing in clinical diagnostics.
• To determine if WGS can overcome the limitations of targeted capturing in WES.

Main Methods:

• Comparative analysis of whole exome sequencing (WES) and PCR-free whole genome sequencing (WGS).
• Assessment of genomic region coverage, with a focus on coding exons and GC-rich regions.
• Evaluation from a clinical and technical perspective.

Main Results:

• Whole genome sequencing (WGS) provides unprecedented and complete coverage of the genome's coding regions.
• WES, relying on selective capturing, demonstrates insufficient coverage, especially in GC-rich areas.
• PCR-free WGS achieves superior and comprehensive genomic data acquisition.

Conclusions:

• Whole genome sequencing (WGS) surpasses whole exome sequencing (WES) in terms of genomic coverage and clinical utility.
• WGS eliminates the necessity for targeted capturing in comprehensive genomic testing for Mendelian disorders.
• WGS represents a significant advancement for clinical genomic diagnostics.