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Comprehensive translational control of tyrosine kinase expression by upstream open reading frames
K Wethmar1,2, J Schulz1, E M Muro3,4
1Department of Cell Differentiation and Tumorigenesis, Max-Delbrueck-Center for Molecular Medicine, Berlin, Germany.
Upstream open reading frames (uORFs) regulate gene expression by controlling translation initiation. Disruptions in these uORFs can lead to increased proto-oncogene translation, potentially contributing to cancer development.
Area of Science:
- Molecular Biology
- Genetics
- Cancer Research
Background:
- Post-transcriptional regulation, particularly translation initiation, is crucial for gene expression control.
- While tyrosine kinase (TK) oncogenic activation is well-studied, translational control mechanisms remain largely unexplored.
Purpose of the Study:
- To investigate the role of upstream open reading frames (uORFs) in the translational control of human tyrosine kinase (TK) mRNAs.
- To explore the broader implications of uORF-mediated translational regulation in proto-oncogene activation and cancer etiology.
Main Methods:
- Analysis of human TK mRNA leader sequences for the presence of uORFs.
- Genetic manipulation to ablate uORF initiation codons in TK transcripts and proto-oncogenes.
- Genome-wide sequence analysis to identify polymorphisms affecting uORF regulatory elements.
Main Results:
- uORFs are present in the majority of human TK mRNA leader sequences.
- Ablation of uORF initiation codons consistently enhanced translation of downstream coding sequences for TKs and other proto-oncogenes.
- Genome-wide analysis revealed polymorphisms impacting uORF initiation and termination in 15.9% of human genes.
Conclusions:
- uORF-mediated translational control plays a significant role in regulating gene expression.
- Loss-of-function mutations in uORFs can lead to aberrant proto-oncogene induction, contributing to cancer.
- A comprehensive map of human uORFs is provided to facilitate further research into their pathogenic roles.
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