Functional diversification of the cephalopod proteome by RNA editing.

RNA editing in Doryteuthis pealeii confirms 7,997 recoded sites at the protein level, reshaping the proteome by affecting stability, localization, modifications, and activity.

• Why it matters: Understanding the functional impact of extensive RNA editing in cephalopods is crucial because it reveals how RNA-level plasticity can diversify protein functions and influence cellular physiology, yet many recoding events' roles remain unclear.
• What they did: The study integrated proteomics with biochemical and cellular assays to characterize recoding across the cephalopod proteome, focusing on how editing alters protein properties and interactions.
• The result: Findings show recoding creates or removes post-translational modification sites, notably in MARCHF5, affecting ubiquitylation and mitochondrial function, thus illustrating RNA editing's role in organelle regulation.