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Updated: Jun 13, 2026
Revealing the Cytoskeletal Organization of Invasive Cancer Cells in 3D
Published on: October 26, 2013
The 3D chromatin landscape of rhabdomyosarcoma
Meng Wang1, Prethish Sreenivas2, Benjamin D Sunkel1
1Nationwide Children's Hospital, Center for Childhood Cancer, Columbus, OH 43205, USA.
Abstract:
Rhabdomyosarcoma (RMS) is a pediatric soft tissue cancer with a lack of precision therapy options for patients. We hypothesized that with a general paucity of known mutations in RMS, chromatin structural driving mechanisms are essential for tumor proliferation. Thus, we carried out high-depth in situ Hi-C in representative cell lines and patient-derived xenografts (PDXs) to define chromatin architecture in each major RMS subtype. We report a comprehensive 3D chromatin structural analysis and characterization of fusion-positive (FP-RMS) and fusion-negative RMS (FN-RMS). We have generated spike-in in situ Hi-C chromatin interaction maps for the most common FP-RMS and FN-RMS cell lines and compared our data with PDX models. In our studies, we uncover common and distinct structural elements in large Mb-scale chromatin compartments, tumor-essential genes within variable topologically associating domains and unique patterns of structural variation. Our high-depth chromatin interactivity maps and comprehensive analyses provide context for gene regulatory events and reveal functional chromatin domains in RMS.
Insights
This study reveals key 3D chromatin structures in pediatric rhabdomyosarcoma (RMS), a cancer lacking targeted therapies. Understanding these structures offers new avenues for precision medicine in fusion-positive and fusion-negative RMS.
Area of Science:
- Genomics
- Cancer Biology
- Epigenetics
Background:
- Rhabdomyosarcoma (RMS) is a pediatric soft tissue cancer with limited precision therapy options.
- The genetic landscape of RMS is not fully understood, suggesting non-mutational drivers like chromatin structure may be crucial for tumor growth.
Purpose of the Study:
- To define the 3D chromatin architecture in major subtypes of rhabdomyosarcoma (RMS).
- To investigate the role of chromatin structural mechanisms in RMS proliferation.
- To compare chromatin structures between cell lines and patient-derived xenografts (PDXs) across different RMS subtypes.
Main Methods:
- High-depth in situ Hi-C experiments were performed on representative RMS cell lines and PDXs.
- Chromatin interaction maps were generated and analyzed for fusion-positive RMS (FP-RMS) and fusion-negative RMS (FN-RMS).
- Comparative analysis was conducted between cell line and PDX models.
Main Results:
- Comprehensive 3D chromatin structural analysis was performed for FP-RMS and FN-RMS.
- Common and distinct structural elements were identified in large megabase-scale chromatin compartments.
- Variable topologically associating domains containing tumor-essential genes and unique structural variations were characterized.
Conclusions:
- High-depth chromatin interactivity maps provide context for gene regulatory events in RMS.
- The study reveals functional chromatin domains critical for RMS.
- These findings lay the groundwork for understanding chromatin's role in RMS pathogenesis and developing precision therapies.
