Single nucleotide variant sequencing errors in whole exome sequencing using the Ion Proton System.

Area of Science:

• Genomics
• Molecular Biology
• Bioinformatics

Background:

• Next-generation sequencing (NGS) is crucial for genomic analysis.
• Interpreting NGS results is hindered by sequencing errors.
• Single nucleotide variants (SNVs) are key genetic variations.

Purpose of the Study:

• To investigate the types and origins of sequencing errors in human germline exome sequencing.
• To identify common sources of false positive SNVs using the Ion Proton system.

Main Methods:

• Exome sequencing of human germline DNA from two consanguineous cases using the Thermo Fisher Ion Proton System and AmpliSeq Exome capture kit.
• Analysis of single nucleotide variants (SNVs).
• Validation of NGS-detected SNVs using Sanger sequencing.

Main Results:

• A total of 98 SNVs detected by NGS were randomly selected for validation.
• Nine of the analyzed SNVs (9.2%) were identified as false positives.
• The majority of false positive SNVs were attributed to homopolymer insertion/deletion errors.
• One error was linked to primer-related issues.

Conclusions:

• Homopolymer insertion/deletion errors are the primary source of SNV sequencing errors in Ion Torrent-based exome sequencing.
• These findings are critical for accurate interpretation of human germline DNA sequencing data.
• Understanding error profiles improves the reliability of NGS applications.