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Comment by ncmncm | Hacker News Reader

Imagine the seas a thick soup of iron complexes and RNA folded into quadrillions of nightmare shapes, a vanishing few of them busy replicating whatever they bumped into. One day, two of them bumped into one another. In the blink of a geologic eye, the seas were brimming with a descendant of whichever of them was faster.

Somewhere, a membrane happened. I don't think anywhere in nature today do we find a membrane created entirely from scratch. Everywhere we find a membrane, it grew from and split off of an existing membrane. It may be that we should think of ourselves as fancy membranes, and DNA, RNA, and protein are just clever ways to make more membrane.

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Bubbles would like to interject. as found in sea foam, for instance.

Sea foam bubbles, really?

Trolling is frowned upon here.

What is it about free lipids and proteins spontaneously joining together in chaotic aquatic environments to form highly resilient microscopically sub-dividable shells that you find so trollishly unrelated to the concept of membranes forming in early earth conditions?

This would have been at a period before any real sophisticated attackers exist, and before life had built up any specific requirements of an "internal" environment too.

It seems intuitive that this would be how it started, goopy little bubbles filled with goo, just barely keeping out the other goo that would disrupt it.

When you find a living organism relying on sea foam to construct an organelle, you may file for your Nobel Prize.

Literally all the organisms we know about make all the membranes they use by adding to an existing membrane, not fetching them from out of their environment. And really, why should they?

Finally: a soap bubble film has air on both sides, and water solution between, and is thus the opposite of any membrane in a cell, which has water on both sides and glyceride in between.

It had to start somewhere, and expecting it to have started with what is currently done sounds optimistic.

It would be somewhat important to use something that works, in preference to one that totally would not.

What a dull life it must be to presume your understanding is complete.

my hazy memory is that it is/was assumed that the cell wall arose pretty naturally from an asymmetric protein that was hydrophilic on one end and hydrophobic on the other.

The hydrothermal vent as a spongey matrix of cell membrane precursors is one theory for this. The thing I like about this idea is that the idea of a boundary exists before membranes, and fit with the idea of the boundary being ‘found’

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