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A Reference System for BRCA Mutation Detection Based on Next-Generation Sequencing in the Chinese Population.

Shoufang Qu1, Qiong Chen2, Yuting Yi3

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A new reference system for BRCA genetic testing in China improves variant interpretation and NGS performance. This system includes interpretation rules, reference materials, and a database, aiding clinical decisions for Chinese patients.

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Area of Science:

  • Genetics
  • Genomic Medicine
  • Molecular Diagnostics

Background:

  • Limited BRCA1/2 mutation data and interpretation guidelines hinder next-generation sequencing (NGS) in China.
  • Standardized BRCA variant interpretation is crucial for accurate genetic testing and clinical decision-making.

Purpose of the Study:

  • To establish a comprehensive reference system for BRCA genetic testing performance evaluation and variant interpretation in the Chinese population.
  • To develop interpretation rules, reference materials (RMs), and a reference database (RD) for BRCA1/2 variants.

Main Methods:

  • BRCA1/2 mutations from cell lines and clinical cases were identified using NGS and validated by Sanger sequencing.
  • A reference database (RD) was constructed by collecting and annotating variant call format files and standard variant datasets.
  • Participant laboratories validated the developed reference system.

Main Results:

  • BRCA2 mutations (55%) were more prevalent than BRCA1 mutations (45%) in Chinese patients.
  • The RD comprises 750 unique BRCA mutations after deduplication from 19,886 variants.
  • The reference system predominantly contains pathogenic or likely pathogenic variants (RMs: 77.5%, RD: 57%), including 91 novel ones.

Conclusions:

  • The established reference system enhances NGS performance and interpretation quality for BRCA genetic testing in China.
  • This system supports clinical decision-making and accelerates the development of BRCA mutation detection technologies in the region.