Single-Cell RNA-Seq Reveals Heterogeneous lncRNA Expression in Xenografted Triple-Negative Breast Cancer Cells

Area of Science:

• Oncology
• Molecular Biology
• Genomics

Background:

• Triple-negative breast cancer (TNBC) is a highly heterogeneous malignancy, posing challenges for treatment.
• Tumor heterogeneity involves varying gene expression profiles and aggressive subclonal populations.
• Long non-coding RNAs (lncRNAs) are increasingly recognized as regulatory molecules in cancer.

Purpose of the Study:

• To investigate in vivo TNBC tumor heterogeneity at the single-cell level.
• To determine if lncRNA expression varies across individual cells within TNBC tumors.
• To assess if lncRNA expression is sufficient to define distinct cellular subpopulations.

Main Methods:

• Application of single-cell RNA sequencing (scRNA-seq) to profile lncRNA expression.
• Analysis of lncRNA expression in TNBC xenografts at single-cell resolution.
• Characterization of lncRNA expression patterns, including ubiquitous, subpopulation-specific, and hybrid expression.

Main Results:

• Most lncRNAs were detected at low levels in TNBC xenografts, with a median of 25 lncRNAs per cell.
• lncRNA expression alone was insufficient to define distinct cellular subpopulations.
• Observed heterogeneous lncRNA expression patterns across cells and subpopulations.

Conclusions:

• Transcriptionally defined tumor cell subpopulations can be identified in cell-line derived xenografts.
• lncRNA expression is highly heterogeneous within TNBC tumors.
• Further research is needed to explore lncRNAs as potential therapeutic targets and biomarkers for TNBC.