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Detecting Somatic Genetic Alterations in Tumor Specimens by Exon Capture and Massively Parallel Sequencing
Published on: October 18, 2013
Germline structural variation globally impacts the cancer transcriptome including disease-relevant genes
Fengju Chen1, Yiqun Zhang1, Fritz J Sedlazeck2
1Dan L. Duncan Comprehensive Cancer Center, Baylor College of Medicine, Houston, TX 77030, USA.
Germline structural variants (SVs) significantly impact gene expression in tumors, affecting hundreds of genes. These variations can influence cancer development and patient survival, offering potential targets for genetic testing and cancer therapies.
Area of Science:
- Genomics
- Cancer Biology
- Molecular Genetics
Background:
- Cancer arises from both germline variations and somatic alterations.
- Understanding how germline structural variants (SVs) influence gene expression in tumors is crucial for cancer research.
Purpose of the Study:
- To investigate the impact of germline SVs on the expression of nearby genes in a large cohort of cancer patients.
- To identify specific germline SVs associated with gene expression changes, cancer-related genes, and patient survival.
Main Methods:
- Combined RNA sequencing and whole-genome sequencing data from 1,218 cancer patients.
- Analyzed recurrent and common germline SV breakpoints within 100 kb of gene loci.
- Assessed associations between germline SVs, gene expression levels, and patient survival.
Main Results:
- Hundreds of genes showed altered expression due to germline SV breakpoints near their loci in tumors.
- Germline SVs frequently involved duplication of intergenic enhancers or disruption of 3' untranslated regions (UTRs).
- Identified genes like ATRX, CEBPA, BARD1, IRS2, and GCLM affected by germline SVs, with some linked to cancer cell line essentiality and patient survival.
Conclusions:
- Germline SVs represent a significant source of phenotypic variation in the context of cancer.
- Specific germline SVs may act as cancer risk variants and have implications for targeted cancer therapies.
- These findings highlight the importance of considering germline structural variation in cancer genetic testing and treatment strategies.
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