Octopuses edit their own genes to survive cold

Octopuses can edit their own genes. When Antarctic octopuses face freezing water, they use RNA editing to recode proteins in their nervous system to keep working in the cold. Instead of changing DNA permanently, they rewrite the RNA message after transcription, altering one letter to change protein function. A 2017 Science study found over 60% of their neural RNAs are edited, far more than humans. It is a live hack that lets them adapt within hours, not generations, sacrificing some long-term DNA evolution for instant cold resistance.