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tRNA over-expression in breast cancer and functional consequences.
Mariana Pavon-Eternod1, Suzanna Gomes, Renaud Geslain
1Department of Biochemistry and Molecular Biology, University of Chicago, Chicago, IL 60637, USA.
Nucleic Acids Research
|September 29, 2009
Summary
Transfer RNAs (tRNAs) are significantly overexpressed in breast cancer cells and tumors, potentially enhancing the translation of cancer-promoting genes. This tRNA dysregulation suggests their role in cancer development and potential use as biomarkers.
Area of Science:
- Molecular Biology
- Cancer Research
- Genomics
Background:
- Cancer cells exhibit increased proliferation and protein synthesis.
- Components of the translation machinery are often misregulated in cancers.
- The specific role of transfer RNAs (tRNAs) in cancer has remained largely unexplored.
Purpose of the Study:
- To investigate genome-wide tRNA expression in breast cancer.
- To compare tRNA expression between cancer and non-cancer cell lines, and between tumors and normal tissues.
- To explore the functional implications of tRNA dysregulation in breast cancer.
Main Methods:
- Genome-wide tRNA expression profiling.
- Comparison of tRNA expression in cancer-derived vs. non-cancer-derived breast cell lines.
- Analysis of tRNA expression in breast tumors vs. normal breast tissues.
Main Results:
- Significant, selective overexpression of both nuclear- and mitochondrial-encoded tRNAs in cancer cell lines (up to 3-5 fold) and tumors (up to 10 fold).
- Distinct expression patterns observed for nuclear- and mitochondrial-encoded tRNAs, suggesting potential as breast cancer biomarkers.
- tRNA isoacceptor expression levels do not optimize translation of housekeeping genes but may favor cancer-related genes.
Conclusions:
- tRNA overexpression is a characteristic feature of breast cancer cells and tissues.
- Overexpressed tRNAs may enhance the translational efficiency of genes critical for cancer development and progression.
- tRNAs represent potential diagnostic biomarkers and therapeutic targets in breast cancer.
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