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Tracing tumorigenesis in a solid tumor model at single-cell resolution.

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Summary

This study maps salivary gland squamous cell carcinoma development in mice. Tumorigenesis progresses from basal cells through cancer stem cells to differentiated cells, revealing a reproducible developmental trajectory.

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Area of Science:

  • Oncology
  • Developmental Biology
  • Genomics

Background:

  • Solid tumor characterization is crucial for understanding cancer initiation, progression, and metastasis.
  • Patient-derived samples offer insights but are heterogeneous and often from advanced stages.
  • Studying tumorigenesis from a developmental perspective in model systems is essential.

Purpose of the Study:

  • To comprehensively characterize tumor-specific cells and their developmental trajectory in salivary gland squamous cell carcinoma.
  • To utilize a mouse model for an unbiased investigation of tumorigenesis from a developmental viewpoint.
  • To create a detailed cell atlas of the tumor microenvironment.

Main Methods:

  • Single-cell transcriptome profiling
  • Epitope profiling
  • Pathway analysis
  • Lineage analysis
  • Mouse model of salivary gland squamous cell carcinoma

Main Results:

  • A comprehensive cell atlas of salivary gland squamous cell carcinoma was generated.
  • Tumor-specific cells were characterized and found to follow a reproducible developmental trajectory.
  • Tumorigenesis initiated in basal cells with an epithelial-to-mesenchymal transition signature.
  • Progression involved Wnt-differential cancer stem cell-like subpopulations.
  • Differentiation led to luminal-like cells.

Conclusions:

  • The study provides unbiased insights into tumor-specific cellular identities within a whole tissue environment.
  • Defined genetic model systems are powerful tools for studying complex biological processes like tumorigenesis.
  • Understanding the developmental trajectory of tumors can inform therapeutic strategies.