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BRCA Testing by Single-Molecule Molecular Inversion Probes.

Kornelia Neveling1, Arjen R Mensenkamp1, Ronny Derks1

  • 1Department of Human Genetics, Radboud university medical center, Nijmegen, the Netherlands.

Clinical Chemistry
|December 16, 2016
PubMed
Summary
This summary is machine-generated.

This study demonstrates that single-molecule molecular inversion probes (smMIPs) enable automated, fast, and accurate genetic testing for BRCA1 and BRCA2 genes. This method improves clinical genetic testing efficiency and reliability.

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Area of Science:

  • Genetics
  • Molecular Biology
  • Clinical Diagnostics

Background:

  • Next-generation DNA sequencing (NGS) tests for single genes need improvement in speed, cost, completeness, and quality.
  • Single-molecule molecular inversion probes (smMIPs) offer potential for enhanced clinical genetic testing.
  • BRCA1 and BRCA2 gene testing is frequently requested and serves as a model for this study.

Purpose of the Study:

  • To develop and validate an automated workflow for clinical genetic testing of BRCA1 and BRCA2 genes using smMIPs.
  • To assess the performance of smMIPs in terms of accuracy, speed, and reliability for diagnostic genetic testing.

Main Methods:

  • Developed and validated BRCA1 and BRCA2 smMIPs using 166 human genomic DNA samples.
  • Established a generic automated workflow for smMIP-based enrichment and sequencing.
  • Included CHEK2 c.1100del variant in the automated workflow for comprehensive analysis.

Main Results:

  • Achieved 100% analytical sensitivity and specificity for pathogenic and benign variants in a subset of 152 samples.
  • Automated workflow correctly identified all true-positive variants (>3000) across 65 in-house and 267 Norwegian samples, with no false positives.
  • Reduced turnaround times by 60% to 10-15 days and detected copy number variants with 100% sensitivity and 88% specificity.

Conclusions:

  • smMIP-based genetic testing provides an automated and reliable method for analyzing BRCA1 and BRCA2 coding sequences.
  • The integrated approach using smMIPs, automation, and sequencing in duplo ensures a robust process and reduces turnaround times.
  • smMIPs offer potential to replace independent tools for copy number variation analysis, streamlining genetic testing.