Nick Lane on Dwarkesh Patel: Why Alkaline Vents Birthed Life

Given the ubiquity of carbon, water, CO₂, hydrogen, and minerals like olivine, Lane argues that alkaline hydrothermal vents and CO₂–H₂-driven metabolism will repeatedly emerge, producing similar small organics, fatty acids, membranes, and ultimately proto-cells on a large fraction of planets.

Across bacteria, archaea, and eukaryotes, cells power growth with membrane potentials and ATP synthase nano-motors; Lane sees this as a deep continuity from vent geochemistry, implying that analogous charge-based systems will likely underpin alien life too.

Bacteria stay small or become giant only via extreme polyploidy, which is energetically costly and doesn’t yield complex internal structures; mitochondria offload energy production and shrink their own genomes, freeing host cells to expand nuclear genomes and evolve intricate compartmentalization and multicellularity.

Despite trillions of bacteria and archaea over billions of years and many likely failed endosymbioses, only one lineage produced full eukaryotic architecture; Lane infers that successful, stable endosymbiosis is an extremely low-probability event, even if basic life is common.

Because mitochondrial genomes degenerate under relaxed selection, uniparental (typically maternal) inheritance and germline ‘mollycoddling’ of oocytes help purge mutations; this sets up a fundamental asymmetry—one sex passes on mitochondria, the other doesn’t—out of which two sexes and their divergent reproductive strategies emerge.