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Somatic mutation phasing and haplotype extension using linked-reads in multiple myeloma.

Steven M Foltz1,2, Yize Li1,2, Lijun Yao1,2

  • 1Department of Medicine, Washington University in St. Louis, St. Louis, MO, 63110, USA.

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Summary

This study phases somatic mutations in multiple myeloma (MM) using linked-read whole genome sequencing. This approach reveals cancer haplotype structures and aids in understanding clonal evolution with higher resolution.

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Area of Science:

  • Genomics
  • Cancer Biology
  • Bioinformatics

Background:

  • Somatic mutation phasing is crucial for understanding cancer driver mutations and clonal evolution.
  • Multiple Myeloma (MM) is a hematological malignancy characterized by complex genetic alterations.

Purpose of the Study:

  • To reconstruct cancer haplotypes and phase somatic mutations in multiple myeloma using linked-read whole genome sequencing.
  • To demonstrate the utility of haplotype-aware analysis for interpreting clonal evolution at higher resolution.

Main Methods:

  • Generated linked-read whole genome sequencing data for 23 samples from 14 MM patients.
  • Systematically assigned somatic mutations to haplotypes using linked-read information.
  • Integrated samples from the same individual to extend phase block length.

Main Results:

  • Reconstructed cancer haplotypes and phase blocks from MM samples.
  • Successfully phased 79.4% of 20,705 high-confidence somatic mutations across multiple myeloma genes.
  • Identified instances where phased mutations provided higher resolution insights into clonal evolution, such as independent subclonal events of multiple mutations within the same gene.

Conclusions:

  • Haplotype-aware analysis of somatic mutations provides valuable insights into cancer genetics and evolution.
  • The developed framework is beneficial for understanding complex cancer cases with sufficient data quality and tumor purity.
  • This approach enhances the resolution of clonal evolution models in multiple myeloma.