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Detection of Copy Number Alterations Using Single Cell Sequencing
Published on: February 17, 2017
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Whole-genome single-cell copy number profiling from formalin-fixed paraffin-embedded samples
Luciano G Martelotto1, Timour Baslan2,3, Jude Kendall2
1Department of Pathology, Memorial Sloan Kettering Cancer Center (MSKCC), New York, New York, USA.
Nature Medicine
|February 7, 2017
Summary
Researchers developed a new method for single-cell genomics on formalin-fixed samples. This technique reveals intratumor genetic heterogeneity in breast cancer progression, aiding precision medicine efforts.
Area of Science:
- Oncology
- Genomics
- Cancer Biology
Background:
- Intratumor genetic heterogeneity complicates precision medicine.
- Single-cell genomics can resolve cellular subpopulations and genetic variations.
- Formalin fixation limits current single-cell genomic applications.
Purpose of the Study:
- To develop a robust method for whole-genome copy-number profiling of single nuclei from formalin-fixed paraffin-embedded (FFPE) tumor samples.
- To apply this method to investigate the genetic heterogeneity and evolutionary processes in breast cancer progression.
Main Methods:
- Development and validation of a single-cell sequencing methodology for FFPE samples.
- Whole-genome copy-number profiling of single nuclei.
- Application to study progression from ductal carcinoma in situ to invasive breast cancer.
Main Results:
- Successful whole-genome copy-number profiling of single nuclei from FFPE breast cancer samples.
- Demonstration of intratumor genetic heterogeneity in ductal carcinomas in situ at diagnosis.
- Identification of diverse evolutionary pathways from in situ to invasive breast cancer.
Conclusions:
- The developed methodology enables single-cell genomic analysis of FFPE tissues, overcoming previous limitations.
- Intratumor genetic heterogeneity is present early in breast cancer development (in situ stage).
- Understanding heterogeneity and evolutionary trajectories is crucial for advancing precision oncology and breast cancer treatment.
