Validation of Next-Generation Sequencer for 24-Chromosome Aneuploidy Screening in Human Embryos

Abstract

BACKGROUND: Next-Generation Sequencing (NGS) is the latest approach for preimplantation genetic diagnoses (PGD). AIM: The purpose of this study was to standardize and validate an NGS method for comprehensive chromosome screening and to investigate its applicability to PGD. METHODS: Embryo biopsy, whole-genome amplification, array comparative genomic hybridization (aCGH), and semiconductor sequencing were employed. RESULTS: A total of 204 whole-genome-amplified products were tested with an NGS-based protocol, from which 100 samples were used for standardization and to evaluate the quality of the results produced by this new technique. The remaining 104 samples tested by NGS were previously analyzed by using the aCGH protocol to determine the sensitivity and specificity of this new technique. In total, 4896 chromosomes were assessed, out of which 196 carried a copy number imbalance. NGS sensitivity and specificity for calling aneuploidy was 100%. CONCLUSION: This is the first study reporting preclinical validation and accuracy assessment of the Ion Torrent Personal Genome Machine (PGM) NGS-based comprehensive chromosome screening method using blastomeres and blastocysts. The NGS proved to be a robust methodology and is ready for clinical application in reproductive medicine, with the major advantage of low cost and enhanced precision when compared with other technologies used for comprehensive chromosome screening.