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Updated: Sep 23, 2025
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Analysis of Somatic Hypermutation in the JH4 intron of Germinal Center B cells from Mouse Peyer's Patches
Published on: April 20, 2021
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Variable Mutation Expression in Human Cancers: A "Hide-and-Seek" Mechanism Linked to Differential MHC-I Presentation
Amélie Boichard1, Razelle Kurzrock2
1Department of Molecular Cancer Genetics, University of Strasbourg Hospitals, Strasbourg, France.
Molecular Cancer Therapeutics
|May 11, 2022
Summary
Genomic mutations are often silenced at the transcript level in human tumors, impacting cancer immunity and treatment. Understanding this variant silencing is crucial for precision medicine approaches.
Area of Science:
- Oncology
- Genomics
- Immunology
Background:
- Genomic mutations do not always translate to protein expression, influencing cancer outcomes.
- Understanding the prevalence and impact of this 'variant silencing' is key to cancer research.
Purpose of the Study:
- To determine the prevalence of somatic mutation loss of expression (variant silencing) in human tumors.
- To investigate the impact of variant silencing on tumor immunogenicity and its potential role in immune evasion.
Main Methods:
- Analysis of whole-exome mutation and mRNA expression data from 636 TCGA cancer patients.
- Prediction of antigenicity and immunogenicity of neopeptides using IEDB tools.
Main Results:
- 9.06% of somatic variants studied were found to be silenced at the transcript level.
- Silenced variants were associated with improved peptide processing, MHC-I binding, and T-cell recognition.
- Variant silencing was more prevalent in lymphocyte-depleted tumors, suggesting a role in immune evasion.
Conclusions:
- Variant silencing is a significant phenomenon in human tumors, affecting tumor immunogenicity.
- This silencing may contribute to tumor resistance and immune evasion strategies.
- Precision medicine should consider both genomic mutations and their transcript expression for therapeutic decisions.
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