Nanotube Partnerships Formed Eukaryotes

Researchers imaged nanotube‑like conduits between an Asgard archaeon and bacteria in Shark Bay stromatolites and found complementary metabolite exchanges, suggesting direct physical transfer of compounds as a mechanism for long‑term symbiosis. If widespread, such nanotube networks could be a concrete pathway by which simple cells partnered and later gave rise to nucleated eukaryotic cells. — This reframes the eukaryogenesis debate from abstract gene‑transfer models to testable, physical microbial interactions—affecting evolutionary theory, astrobiology, and how we interpret ancient microbial fossils.