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Updated: Dec 30, 2025
Chromatin Isolation by RNA Purification ChIRP
Published on: March 25, 2012
The landscape of chimeric RNAs in non-diseased tissues and cells
Sandeep Singh1, Fujun Qin1, Shailesh Kumar2
1Department of Pathology, School of Medicine, University of Virginia, Charlottesville, VA 22908, USA.
Abstract:
Chimeric RNAs and their encoded proteins have been traditionally viewed as unique features of neoplasia, and have been used as biomarkers and therapeutic targets for multiple cancers. Recent studies have demonstrated that chimeric RNAs also exist in non-cancerous cells and tissues, although large-scale, genome-wide studies of chimeric RNAs in non-diseased tissues have been scarce. Here, we explored the landscape of chimeric RNAs in 9495 non-diseased human tissue samples of 53 different tissues from the GTEx project. Further, we established means for classifying chimeric RNAs, and observed enrichment for particular classifications as more stringent filters are applied. We experimentally validated a subset of chimeric RNAs from each classification and demonstrated functional relevance of two chimeric RNAs in non-cancerous cells. Importantly, our list of chimeric RNAs in non-diseased tissues overlaps with some entries in several cancer fusion databases, raising concerns for some annotations. The data from this study provides a large repository of chimeric RNAs present in non-diseased tissues, which can be used as a control dataset to facilitate the identification of true cancer-specific chimeras.
Insights
Chimeric RNAs are found in healthy human tissues, not just cancer. This study maps these RNAs in normal tissues, providing a crucial control dataset for cancer research.
Area of Science:
- Genomics
- Molecular Biology
- Bioinformatics
Background:
- Chimeric RNAs were traditionally linked to cancer, serving as biomarkers and therapeutic targets.
- Recent findings suggest chimeric RNAs also occur in non-cancerous cells, but large-scale studies are limited.
Purpose of the Study:
- To comprehensively map the landscape of chimeric RNAs in diverse non-diseased human tissues.
- To develop classification methods for chimeric RNAs and assess their functional relevance.
- To establish a control dataset for distinguishing cancer-specific chimeric RNAs.
Main Methods:
- Analysis of 9,495 non-diseased human tissue samples from the Genotype-Tissue Expression (GTEx) project.
- Development and application of classification criteria for chimeric RNAs.
- Experimental validation of selected chimeric RNAs and assessment of their functional roles.
Main Results:
- Identification and cataloging of chimeric RNAs across 53 different non-diseased human tissues.
- Observed enrichment of specific chimeric RNA classifications under stringent filtering.
- Experimental validation confirmed the presence and functional relevance of certain chimeric RNAs in non-cancerous cells.
- Overlap noted between identified non-diseased chimeric RNAs and entries in cancer fusion databases.
Conclusions:
- Chimeric RNAs are present in a wide range of non-diseased human tissues.
- The established classification system aids in characterizing chimeric RNAs.
- This dataset serves as a vital control resource to improve the accuracy of identifying cancer-specific chimeric RNAs and reassess existing cancer gene annotations.
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