The ubiquitous Epstein-Barr virus targets “fragile DNA,” triggering dysfunction that is associated with a variety of cancers. Researchers have discovered how the Epstein-Barr virus (EBV) exploits human genomic weaknesses to cause cancer and suppress the body's defenses. The study shows that the E
Researchers have discovered how the Epstein-Barr virus exploits human genomic weaknesses to cause cancer and suppress the body’s defenses. The study shows that the EBNA1 viral protein binds to a fragile site on human chromosome 11, leading to chromosomal breakage and genomic instability that may result in cancer. This finding could help identify risk factors and develop preventative strategies for EBV-associated diseases.
EBV causes infectious mononucleosis and similar ailments, though often there are no symptoms. Most infections are mild and pass, but the virus persists in the body, becoming latent or inactive, sometimes reactivating. Long-term latent infections are associated with several chronic inflammatory conditions and multiple cancers.
In the new study, Cleveland and colleagues focus on EBNA1, a viral protein that persists in cells infected with EBV. EBNA1 was previously known to bind at a specific genomic sequence in the EBV genome at the origin of replication. The researchers found that EBNA1 also binds a cluster of EBV-like sequences at a fragile site on human chromosome 11 where increasing abundance of the protein triggers chromosomal breakage.
When the scientists examined whole-genome sequencing data for 2,439 cancers across 38 tumor types from the Pan-Cancer Analysis of Whole Genomes project, they found that cancer tumors with detectable EBV revealed higher levels of chromosome 11 abnormalities, including 100% of the head and neck cancer cases.
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