Related Experiment Video
Updated: Aug 7, 2026
Determining Genetic Expression Profiles in C. elegans Using Microarray and Real-time PCR
Published on: July 30, 2011
Identification of novel genes expressed during rhabdomyosarcoma differentiation using cDNA microarrays
Kate A Carey1, David Segal, Reuben Klein
1Center for Physical Activity and Nutrition, School of Exercise and Nutrition Sciences, Deakin University, Melbourne, Australia.
Abstract:
Rhabdomyosarcomas (RMS) are highly aggressive tumors that are thought to arise as a consequence of the regulatory disruption of the growth and differentiation of skeletal muscle progenitor cells. Normal myogenesis is characterized by the expression of the myogenic regulatory factor gene family but, despite their expression in RMS, these tumor cells fail to complete the latter stages of myogenesis. The RMS cell line RD-A was treated with 12-O-tetradecanoylphorbol-13-acetate to induce differentiation and cultured for 10 days. RNA was extracted on days 1, 3, 6, 8 and 10. A human skeletal muscle cDNA microarray was developed and used to analyze the global gene expression of RMS tumors over the time-course of differentiation. As a comparison, the genes identified were subsequently examined during the differentiated primary human skeletal muscle cultures. Prothymosin alpha (PTMA), and translocase of inner mitochondrial membrane 10 (Tim10), two genes not previously implicated in RMS, showed reduced expression during differentiation. Marked differences in the expression of PTMA and Tim10 were observed during the differentiation of human primary skeletal muscle cells. These results identify several new genes with potential roles in the myogenic arrest present in rhabdomyosarcoma. PTMA expression in RMS biopsy samples might prove to be an effective diagnostic marker for this disease.
Insights
Rhabdomyosarcoma tumor cells fail to differentiate normally. New research identifies Prothymosin alpha (PTMA) and Tim10 gene expression changes, suggesting PTMA as a potential diagnostic marker for this aggressive cancer.
Area of Science:
- Molecular Biology
- Oncology
- Cell Differentiation
Background:
- Rhabdomyosarcomas (RMS) are aggressive tumors originating from disrupted skeletal muscle progenitor cell growth and differentiation.
- RMS cells express myogenic regulatory factors but fail to complete myogenesis.
Purpose of the Study:
- To investigate global gene expression during the differentiation of RMS cells.
- To identify genes involved in the myogenic arrest characteristic of rhabdomyosarcoma.
Main Methods:
- The RD-A RMS cell line was induced to differentiate using 12-O-tetradecanoylphorbol-13-acetate over 10 days.
- Global gene expression was analyzed using a human skeletal muscle cDNA microarray.
- Gene expression was compared between differentiating RMS cells and primary human skeletal muscle cells.
Main Results:
- Prothymosin alpha (PTMA) and translocase of inner mitochondrial membrane 10 (Tim10) showed reduced expression during RMS differentiation.
- Significant differences in PTMA and Tim10 expression were observed compared to primary muscle cell differentiation.
- Several novel genes potentially involved in RMS myogenic arrest were identified.
Conclusions:
- PTMA and Tim10 are newly implicated genes in rhabdomyosarcoma biology.
- PTMA expression may serve as a valuable diagnostic marker for rhabdomyosarcoma.
- Understanding these gene expression changes offers insights into RMS pathogenesis.
