{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,9]],"date-time":"2026-02-09T22:10:50Z","timestamp":1770675050879,"version":"3.49.0"},"reference-count":93,"publisher":"MDPI AG","issue":"2","license":[{"start":{"date-parts":[[2026,1,25]],"date-time":"2026-01-25T00:00:00Z","timestamp":1769299200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Life"],"abstract":"<jats:p>A 19 nt fragment that spans the SARS-CoV-2 furin cleavage site (FCS) is identical to the reverse complement of a proprietary human DNA repair gene sequence. Rather than interpreting this overlap as evidence of a laboratory event, this article uses it as a theoretical springboard to explore underappreciated biorisk concerns, specifically in the context of cancer research. Although they are RNA viruses, coronaviruses are capable of hijacking host DNA damage response (DDR) pathways, exploiting nuclear functions to enhance replication and evade innate immunity. Under selective pressures (antivirals, DDR antagonists, or large-scale siRNA libraries designed to silence critical host genes), escape mutants may arise with fitness advantages. Parallel observations involving in vivo RNA interference via chimeric viruses lend plausibility to some of the key aspects underlying unappreciated biorisks. The mechanistic insights that incorporate DNA repair mechanisms, CoVs in the nucleus, specifics of viruses in cancer research, anticancer drugs, automated gene silencing experiments, and gene sequence overlaps identify gaps in biorisk policies, even those unaccounted for by the potent \u201cSequences of Concern\u201d paradigm. Key concerning attributes, including genome multifunctionality, such as NLS\/FCS in SARS-CoV-2, antisense sequences, and their combination, are further described in more general terms. The article concludes with recommendations pairing modern technical safeguards with enduring ethical principles.<\/jats:p>","DOI":"10.3390\/life16020199","type":"journal-article","created":{"date-parts":[[2026,1,26]],"date-time":"2026-01-26T10:24:36Z","timestamp":1769423076000},"page":"199","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Synthetic Integration of an FCS into Coronaviruses\u2014Hype or an Unresolved Biorisk? An Integrative Analysis of DNA Repair, Cancer Research, Drug Development, and Escape Mutant Traits"],"prefix":"10.3390","volume":"16","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-2016-5027","authenticated-orcid":false,"given":"Siguna","family":"Mueller","sequence":"first","affiliation":[{"name":"Center for Research in Medical Pharmacology, University of Insubria, 21100 Varese, Italy"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2026,1,25]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","unstructured":"Ambati, B.K., Varshney, A., Lundstrom, K., Pal\u00fa, G., Uhal, B.D., Uversky, V.N., and Brufsky, A.M. (2022). MSH3 homology and potential recombination link to SARS-CoV-2 furin cleavage site. Front. 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