A novel H2A-A127 variant is associated with human cancer and enhances tumor-related phenotypes in Drosophila melanogaster models
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By
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Zeinab AlHajj Hassan
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Hassan Dakik
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Patricia Arreba-Tutusaus
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Felice Frey
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Sarah Mantash
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Amanda Mitchell
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Meaghan Boileau
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Sagi Abelson
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Malak Kleit
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Zahraa Hayek
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Jana Awada
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Roy El Darzi
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Kolja Eppert
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Margret Shirinian
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July 13, 2026
Objective:
To identify novel variants in histone genes associated with human cancers, particularly focusing on the H2A-A127 variant.
Approach:
- Cancer genomic analysis: Interrogated cancer genomic datasets to identify novel variants.
- In vivo functional assays: Conducted assays using Drosophila melanogaster tumor models to assess the impact of identified variants.
Key Findings:
- Identified a recurrent Alanine to Valine substitution at position 127 (H2A-A127V) in AML and solid tumors.
- H2A-A127V promotes eye tumor phenotypes and tissue overgrowth in Drosophila models.
- The variant interacts with the Enhancer of zeste (E(z)), suggesting a role in disease progression.
- H2A-A127V is an uncommon polymorphism (1.44%) that may predispose carriers to cancer.
Interpretation:
The findings highlight the significance of considering duplicated histone genes in mutation analyses for a better understanding of cancer development.
Limitations:
- The study primarily focuses on a specific variant and may not encompass the full spectrum of histone mutations in cancer.
- Potential biases in genomic datasets and the limitations of Drosophila models in fully replicating human cancer biology.
Conclusion:
The study uncovers a novel cancer-associated histone variant.
