Ancient chromosome changes may have helped cephalopods develop complex brains

DNA is folded inside cells, and that folding can bring genes close to the sequences that control them.

Researchers found that octopuses, squid and cuttlefish share an ancient chromosome rearrangement but have many different DNA loops.

The team suggests the changes may have created new ways to control genes and helped these animals develop complex brains.

This is a possible explanation, not a proven cause.