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Scalable whole-genome single-cell library preparation without preamplification.

Hans Zahn1,2, Adi Steif1,3, Emma Laks1,3

  • 1Genome Science and Technology Graduate Program, University of British Columbia, Vancouver, British Columbia, Canada.

Nature Methods
|January 10, 2017
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Summary

Direct library preparation (DLP) offers a cost-effective, scalable method for single-cell genomics. This approach improves coverage uniformity and enables detection of rare cell populations and genomic alterations without preamplification.

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Area of Science:

  • Genomics
  • Cancer Biology
  • Molecular Biology

Background:

  • Single-cell genomics is crucial for understanding cancer cell heterogeneity.
  • Existing library preparation methods are costly, require preamplification, and introduce bias.

Purpose of the Study:

  • To introduce Direct Library Preparation (DLP), a novel, robust, and scalable method for single-cell whole-genome library preparation.
  • To evaluate DLP's performance in terms of coverage uniformity, bias reduction, and detection of genomic alterations.

Main Methods:

  • Developed nanoliter-volume transposition reactions for preamplification-free single-cell whole-genome library preparation.
  • Applied DLP to 782 cells from cell lines and triple-negative breast xenograft tumors.
  • Utilized low-depth sequencing and phylogenetic analysis.

Main Results:

  • DLP demonstrated greater coverage uniformity and more reliable copy-number alteration detection compared to existing methods.
  • Identified minor xenograft subpopulations undetectable by bulk sequencing.
  • Revealed dynamic clonal expansion and diversification across passages.
  • Generated high-depth, uniform 'bulk-equivalent' genomes by merging single-cell data.

Conclusions:

  • Low-depth sequencing of DLP libraries is a viable alternative to conventional bulk sequencing.
  • DLP enables cell-level copy number analysis and population-level genomic variant analysis.
  • This method enhances the study of cellular heterogeneity and genomic evolution in cancer.