Genome confirms fish steals bioluminescence from prey
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- Parapriacanthus ransonneti lacks the luciferase gene entirely — a high-quality draft genome revealed no trace of ostracod-derived luciferase genes and no evidence of horizontal gene transfer from its prey
- Manabu Bessho-Uehara, Associate Professor at Tohoku University's Frontier Research Institute for Interdisciplinary Sciences (FRIS), led the team and stated the fish "relies entirely on proteins obtained from its prey"
- The fish obtains luciferase from bioluminescent ostracods (sea fireflies) it consumes, then retains the functional protein to emit light — previously discovered by the same team, but unconfirmed at the genomic level until now
- The findings represent the first definitive genomic proof of kleptoproteinism, a phenomenon in which organisms acquire and use functional components from other species rather than encoding them in their own DNA
- Results were published in Scientific Reports (2026) under DOI 10.1038/s41598-026-43942-6, with the research provided by Tohoku University
- The authors say the work may open avenues for innovative drug delivery systems for oral therapeutics, since understanding how ingested proteins evade digestion and remain functional could inform new delivery methods
Why it matters: This is the first genome-level confirmation that an animal sustains a complex biological function by co-opting proteins from another organism's body, challenging the central dogma that an organism's traits are dictated by its own genome. The source explicitly ties the discovery to drug delivery: if researchers can replicate how this fish protects ingested luciferase from digestion, it could inform the design of oral therapeutics that survive the gut intact.
